FIELD OF DISCLOSURE

[0001] The present disclosure generally relates to environmental chemical
engineering. More particularly, the present disclosure generally relates to process of preparing three-dimensional carbon from waste materials such as eggshells and waste paper for storing energy.
BACKGROUND OF THE DISCLOSURE
[0002] The background description includes information that may be useful
in understanding the present invention. It is not an admission that any of the
information provided herein is prior art or relevant to the presently claimed
invention, or that any publication specifically or implicitly referenced is prior art.
[0003] In general, with depletion of fossil fuels, an energy harvesting from
natural resources and storage of the natural resources for later usage may be currently research topic. Consequently, cost effective development of house-hold bio-degradable energy storage devices may also be in current research topic. Further, carbon-based electrodes may be highly stable under different chemical and high thermal environments. Hence, development of effective Three Dimension (3D) architecture of carbon from natural carbon resources, specifically plant-based carbon, may be highly motivated for researchers.
[0004] In addition, lithium-ion batteries may be used in most of portable
devices, due to high energy density, excellent cyclic life and reliable performance characteristics. However, lithium-ion batteries may suffer from disadvantages such as limited resources of lithium, high fabrication costs, environmental safety and non-recyclable nature of its source. For cost reductions and fulfilment of energy demands, an alternative resource may be required. Monovalent ion (sodium or potassium) and multivalent ion (magnesium, calcium or aluminium) batteries may meet the energy demand. These batteries may be free from dendrite formations during charging/discharging which may be commonly noted in lithium batteries. Among the many multivalent ions, calcium (Ca) may be abundantly available in nature and may be cost effective. Moreover, the deposition potential of calcium may be higher than lithium (0.17V) and lower than Mg (0.5V), resulting in higher

energy density compared to magnesium ions battery. The ion size of Ca2+ (lA)
may be similar to Na+ (1.02A), Mg2+ (0.72A) and Li+ (0.76A), which may be
suitable for multivalent batteries and super-capacitors. The limited resources of
lithium and high-cost fabrication, accompanied with abundance in calcium and
carbon, pave the way for calcium-ion and carbon composites for energy storage
devices. However, the advancement of Ca-ion energy storage system may have
been sluggish due to the slow diffusion rate of Ca ions into the active electrode
materials and additionally poor cyclic stability with low working voltage.
[0005] Hence, there is a need for developing efficient ways of preparing
calcium-deposited three-dimensional carbon for storing energy. Hence, there is a need in the state of the art to provide the process and method which solves the aforementioned problems.
OBJECTS OF THE INVENTION
[0006] Some of the objects of the present disclosure, which at least one
embodiment herein satisfies, are as listed herein below.
[0007] An object of the present disclosure is to provide a process of
preparing calcium-deposited three-dimensional carbon for storing energy from
waste materials.
[0008] An object of the present disclosure is to provide a process of
preparing calcium-deposited three-dimensional carbon for storing energy from
waste paper and eggshells.
[0009] An object of the present disclosure is to provide a process of
preparing calcium-deposited three-dimensional carbon with high capacitance.
[00010] An object of the present disclosure is to provide a process of
preparing calcium-deposited three-dimensional carbon with improved cyclic
stability and power delivery capacity.
[00011] An object of the present disclosure is to provide a process of
preparing calcium-deposited three-dimensional carbon that is scalable for industrial
applications.

SUMMARY
[00012] The present disclosure relates to a process of preparing calcium-
deposited three-dimensional (3D) carbon for storing energy. The process includes cleaning one or more waste papers using a chemical reagent to remove one or more hydrophobic impurities in the one or more waste papers. Further, the process includes treating the cleaned one or more waste papers using an acetic acid to convert the one or more waste papers into a cellulose pulp. Furthermore, the process includes treating one or more eggshells with a sodium oxychloride to clean the one or more eggshells. The process includes drying and subsequently grinding the cleaned one or more eggshells into powdered eggshells. Further, the process includes mixing the powdered eggshells with the cellulose pulp treated in the acetic acid, by constantly stirring to produce uniform mixture of the powdered eggshells and the cellulose pulp. Thereafter, the process includes freeze-drying the uniform mixture until moisture is removed from the uniform mixture. Further, the process includes carbonating the freeze-dried uniform mixture under nitrogen environment to obtain pre-calcined carbon. Thereafter, the process includes calcinating the pre-calcined carbon under nitrogen environment and hydrogen environment to obtain the calcium-deposited three-dimensional (3D) carbon.
[00013] In an aspect, the chemical reagent is at least one of an acetone, an
ethanol, and a 2-propanol.
[00014] In an aspect, cleaning one or more waste papers using the chemical
agent removes all hydrophobic impurities comprising at least one of a colour, an
adhesive, an ink, a food oil, a food waste, a dust, and a mud.
[00015] In another aspect, mixing the powdered eggshells with the cellulose
pulp treated in the acetic acid forms a gel due to the presence of calcium acetate and cellulose pulp, wherein, mixing the powdered eggshells with the cellulose pulp treated in the acetic acid is carried out at a temperature of about 80°C, wherein carbonating is carried out at a temperature of 600°C for 6 to 12 hours of time, and wherein calcinating is carried out at a temperature of 900°C, wherein the carbonating time is based on the quality of the cellulose pulp.

[00016] In another aspect, the calcium-deposited three-dimensional carbon
is fabricated into electrode, and wherein, the calcium-deposited three-dimensional (3D) carbon further comprises heavy elements originated from the waste paper, wherein the heavy elements is at least one of a cadmium, a chromium, a lead, and a mercury.
[00017] Further, the present disclosure relates to a method of producing
calcium-deposited three-dimensional (3D) carbon for storing energy. The production method includes cleaning one or more waste papers using a chemical reagent to remove one or more hydrophobic impurities in the one or more waste papers. Further, the production method includes treating the cleaned one or more waste papers using an acetic acid to convert the one or more waste papers into a cellulose pulp. Furthermore, the production method includes treating one or more eggshells with a sodium oxychloride to clean the one or more eggshells. The process includes drying and subsequently grinding the cleaned one or more eggshells into powdered eggshells. Further, the production method includes mixing the powdered eggshells with the cellulose pulp treated in the acetic acid, by constantly stirring to produce uniform mixture of the powdered eggshells and the cellulose pulp. Thereafter, the production method includes freeze-drying the uniform mixture until moisture is removed from the uniform mixture. Further, the production method includes carbonating the freeze-dried uniform mixture under nitrogen environment to obtain pre-calcined carbon. Thereafter, the production method includes calcinating the pre-calcined carbon under nitrogen environment and hydrogen environment to obtain the calcium-deposited three-dimensional (3D) carbon.
[00018] In an aspect, the chemical reagent is at least one of an acetone, an
ethanol, and a 2-propanol.
[00019] In an aspect, cleaning one or more waste papers using the chemical
agent removes all hydrophobic impurities comprising at least one of a colour, an
adhesive, an ink, a food oil, a food waste, a dust, and a mud.
[00020] In another aspect, mixing the powdered eggshells with the cellulose
pulp treated in the acetic acid forms a gel due to the presence of calcium acetate and

cellulose pulp, wherein, mixing the powdered eggshells with the cellulose pulp
treated in the acetic acid is carried out at a temperature of about 80°C, wherein
carbonating is carried out at a temperature of 600°C for 6 to 12 hours of time, and
wherein calcinating is carried out at a temperature of 900°C, wherein the
carbonating time is based on the quality of the cellulose pulp.
[00021] In another aspect, the calcium-deposited three-dimensional carbon
is fabricated into electrode, and wherein, the calcium-deposited three-dimensional (3D) carbon further comprises heavy elements originated from the waste paper, wherein the heavy elements is at least one of a cadmium, a chromium, a lead, and a mercury.
[00022] Various objects, features, aspects and advantages of the present
disclosure will become more apparent from the following detailed description of preferred embodiments, along with the accompanying drawing figures in which like numerals represent like features.
[00023] Within the scope of this application, it is expressly envisaged that
the various aspects, embodiments, examples and alternatives set out in the preceding paragraphs, in the claims and/or in the following description and drawings, and in particular the individual features thereof, may be taken independently or in any combination. Features described in connection with one embodiment are applicable to all embodiments, unless such features are incompatible.
BRIEF DESCRIPTION OF DRAWINGS
[00024] The accompanying drawings are included to provide a further
understanding of the present disclosure, and are incorporated in and constitute a part of this specification. The drawings illustrate exemplary embodiments of the present disclosure and, together with the description, serve to explain the principles of the present disclosure. The diagrams are for illustration only, which thus is not a limitation of the present disclosure, and wherein:
[00025] FIG. 1 illustrates an exemplary flow diagram representation of
process and production method for calcium-deposited three-dimensional (3D)

carbon for storing energy, in accordance with an embodiment of the present disclosure.
DETAILED DESCRIPTION
[00026] The following is a detailed description of embodiments of the
disclosure depicted in the accompanying drawings. The embodiments are in such detail as to clearly communicate the disclosure. However, the amount of detail offered is not intended to limit the anticipated variations of embodiments; on the contrary, the intention is to cover all modifications, equivalents, and alternatives falling within the spirit and scope of the present disclosure as defined by the appended claims.
[00027] In the following description, numerous specific details are set forth
in order to provide a thorough understanding of embodiments of the present
invention. It will be apparent to one skilled in the art that embodiments of the
present invention may be practiced without some of these specific details.
[00028] If the specification states a component or feature "may", "can",
"could", or "might" be included or have a characteristic, that particular component
or feature is not required to be included or have the characteristic.
[00029] As used in the description herein and throughout the claims that
follow, the meaning of "a," "an," and "the" includes plural reference unless the context clearly dictates otherwise. Also, as used in the description herein, the meaning of "in" includes "in" and "on" unless the context clearly dictates otherwise.
[00030] Exemplary embodiments will now be described more fully
hereinafter with reference to the accompanying drawings, in which exemplary embodiments are shown. These exemplary embodiments are provided only for illustrative purposes and so that this disclosure will be thorough and complete and will fully convey the scope of the invention to those of ordinary skill in the art. The invention disclosed may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Various modifications will be readily apparent to persons skilled in the art. The general

principles defined herein may be applied to other embodiments and applications without departing from the spirit and scope of the invention. Moreover, all statements herein reciting embodiments of the invention, as well as specific examples thereof, are intended to encompass both structural and functional equivalents thereof. Additionally, it is intended that such equivalents include both currently known equivalents as well as equivalents developed in the future (i.e., any elements developed that perform the same function, regardless of structure). Also, the terminology and phraseology used is for the purpose of describing exemplary embodiments and should not be considered limiting. Thus, the present invention is to be accorded the widest scope encompassing numerous alternatives, modifications and equivalents consistent with the principles and features disclosed. For purpose of clarity, details relating to technical material that is known in the technical fields related to the invention have not been described in detail so as not to unnecessarily obscure the present invention.
[00031] Thus, for example, it will be appreciated by those of ordinary skill
in the art that the diagrams, schematics, illustrations, and the like represent conceptual views or processes illustrating systems and methods embodying this invention. The functions of the various elements shown in the figures may be provided through the use of dedicated hardware as well as hardware capable of executing associated software. Similarly, any switches shown in the figures are conceptual only. Their function may be carried out through the operation of program logic, through dedicated logic, through the interaction of program control and dedicated logic, or even manually, the particular technique being selectable by the entity implementing this invention. Those of ordinary skill in the art further understand that the exemplary hardware, software, processes, methods, and/or operating systems described herein are for illustrative purposes and, thus, are not intended to be limited to any particular named element.
[00032] The ensuing description provides exemplary embodiments only, and
is not intended to limit the scope, applicability, or configuration of the disclosure. Rather, the ensuing description of the exemplary embodiments will provide those skilled in the art with an enabling description for implementing an exemplary

embodiment. It should be understood that various changes may be made in the function and arrangement of elements without departing from the spirit and scope of the disclosure as set forth in the appended claims.
[00033] Specific details are given in the following description to provide a
thorough understanding of the embodiments. However, it will be understood by one
of ordinary skill in the art that the embodiments may be practiced without these
specific details. For example, circuits, systems, networks, processes, and other
components may be shown as components in block diagram form in order not to
obscure the embodiments in unnecessary detail. In other instances, well-known
circuits, processes, algorithms, structures, and techniques may be shown without
unnecessary detail in order to avoid obscuring the embodiments.
[00034] Each of the appended claims defines a separate invention, which for
infringement purposes is recognized as including equivalents to the various elements or limitations specified in the claims. Depending on the context, all references below to the "invention" may in some cases refer to certain specific embodiments only. In other cases, it will be recognized that references to the "invention" will refer to subject matter recited in one or more, but not necessarily all, of the claims.
[00035] All methods described herein can be performed in any suitable order
unless otherwise indicated herein or otherwise clearly contradicted by context. The
use of any and all examples, or exemplary language (e.g., "such as") provided with
respect to certain embodiments herein is intended merely to better illuminate the
invention and does not pose a limitation on the scope of the invention otherwise
claimed. No language in the specification should be construed as indicating any
non-claimed element essential to the practice of the invention.
[00036] Various terms as used herein are shown below. To the extent a term
used in a claim is not defined below, it should be given the broadest definition persons in the pertinent art have given that term as reflected in printed publications and issued patents at the time of filing.
[00037] Embodiments herein provides a process of preparing a calcium-
deposited three-dimensional carbon with improved cyclic stability and power

deliverable capacity. The present disclosure provides a process of preparing a calcium-deposited three-dimensional carbon that consumes waste materials thereby contributing ecologically. The present disclosure provides an efficient, cost-effective process of preparing calcium-deposited three-dimensional carbon. The process of the present disclosure produces carbon that has high capacitance performance and energy density.
[00038] Referring to FIG. 1 illustrating an exemplary flow diagram
representation of process and production method for calcium-deposited three-dimensional (3D) carbon for storing energy, in accordance with an embodiment of the present disclosure. In an embodiment, a calcium ion may be uniformly deposited over a surface of carbonized paper. Further, source of calcium and carbon may be a waste materials, specifically waste paper and eggshells. Furthermore, a calcium-cellulose pulp (Ca-CP) may be further processed to produce a calcium deposited three-dimensional carbon.
[00039] As illustrated in FIG. 1, the method 100 includes one or more blocks
illustrating a method of for calcium-deposited three-dimensional (3D) carbon for
storing energy. The method 100 may be described in the general context of
computer-executable instructions. Generally, computer-executable instructions can
include routines, programs, objects, components, data structures, procedures,
modules, and functions, which perform functions or implement abstract data types.
[00040] The order in which the method 100 is described is not intended to be
construed as a limitation, and any number of the described method blocks can be
combined in any order to implement the method 100. Additionally, individual
blocks may be deleted from the methods without departing from the spirit and scope
of the subject matter described herein. Furthermore, the method 100 can be
implemented in any suitable hardware, software, firmware, or combination thereof.
[00041] At block 102, the method 100 may include cleaning one or more
waste papers using a chemical reagent to remove one or more hydrophobic impurities in the one or more waste papers.

[00042] At block 104, the method 100 may include treating the cleaned one
or more waste papers using an acetic acid to convert the one or more waste papers into a cellulose pulp.
[00043] At block 106, the method 100 may include treating one or more
eggshells with a sodium oxychloride to clean the one or more eggshells.
[00044] At block 108, the method 100 may include drying and subsequently
grinding the cleaned one or more eggshells into powdered eggshells.
[00045] At block 110, the method 100 may include mixing the powdered
eggshells with the cellulose pulp treated in the acetic acid, by constantly stirring to
produce uniform mixture of the powdered eggshells and the cellulose pulp.
[00046] At block 112, the method 100 may include freeze-drying the
uniform mixture until moisture is removed from the uniform mixture.
[00047] At block 114, the method 100 may include carbonating the freeze-
dried uniform mixture under nitrogen environment to obtain pre-calcined carbon.
[00048] At block 116, the method 100 may include calcinating the pre-
calcined carbon under nitrogen environment and hydrogen environment to obtain the calcium-deposited three-dimensional (3D) carbon.
[00049] In an embodiment, the powdered eggshells in cellulose pulp in acetic
acid environment may form a gel due to the presence of calcium acetate and
cellulose pulp. In an embodiment, the chemical reagent for removing hydrophobic
impurities may be selected from, but not limited to, acetone, ethanol, 2-propanol or
combinations thereof, and the like. Any other known chemical agents for removal
of hydrophobic impurities may be used. In an embodiment, the carbonization may
be carried out at a temperature of about 600°C, and the like. The carbonization may
be carried out by a process generally known in the art. In an embodiment, the
calcination may be carried out at a temperature of about 900°C, and the like. The
calcination may be carried out by a process generally known in the art.
[00050] In an embodiment, the waste paper may be selected from, but not
limited to, newspaper, magazine, printed paper, catalogues, brochures, paper scraps, packaging, or combinations thereof, and the like. In an embodiment, the eggshells are preferably eggshells of chicken eggs. In an embodiment, the

carbonizing time may range from about 6 hours to about 12 hours. The carbonizing time depends on the quality of the pulp, low quality peach board pulp will take longer time for carbonization because of higher lignin content whereas soft cellulose pulp will take very short time to carbonize.
[00051] In an embodiment, the calcium-deposited three-dimensional carbon
may be fabricated into a number of carbon devices, specifically an electrode. The electrode may be the negative electrode of an electrochemical cell and the like. An expandable graphitic carbon or nitrogen-doped high surface area crystalline carbon electrode may be employed as a positive electrode. The electrolyte may be prepared from Ca(PF6)2, dimethyl carbonate, diethyl carbonate, ethylene carbonate or the like.
[00052] In an embodiment, the electrode may be used in pulsed power
applications and energy storage device selected from a battery, fuel cell,
supercapacitor, or combinations thereof or the like. In an embodiment, the calcium-
deposited three-dimensional carbon may also possess some heavy elements that
may originate from the waste paper that is employed for the process. The heavy
elements that may be present include, but not limited to, cadmium, chromium, lead,
mercury or combinations thereof, and the like. Presence of heavy metals with
calcium-deposited carbon may be beneficiary for catalytic properties of battery.
[00053] In an embodiment, the cleaning of waste paper with the chemical
agent removes all hydrophobic impurities including, but not limited to, colour, adhesives, ink, food oils, food waste, dust, mud or combinations thereof, and the like. In an embodiment, before cleaning the waste paper may be cut into smaller pieces for easier processing.
[00054] In an embodiment, the waste paper cleaned may be cleaned with
acetone and 2-propanol and may be soaked overnight in water before treatment with acetic acid. In an embodiment, the eggshells may be washed clean in water before treatment with sodium oxychloride.
[00055] In an embodiment, the powdered eggshells may be kept for storage
in a cool and dry place before usage for the rest of the process. In an embodiment,

the addition of powdered eggshells to the cellulose pulp in acetic acid environment
may preferably be carried out at a temperature of about 80°C, and the like.
[00056] In an embodiment, the process is cost-effective, eco-friendly,
requires minimal chemicals, zero consumption of harmful chemicals for preparing
cellulose pulp, and consumes waste materials to decrease harmful environmental
impact. The process also decreases pollution caused by burning of paper.
[00057] In an embodiment, the calcium-deposited three-dimensional carbon
may possess high volume-to-surface ratio that enhances capacitance performance and energy density. The volume-to-surface ratio may be in the range of about 700 to about 1700 m2/g.
[00058] In an embodiment, the process permits control of calcium
percentage in the cellulose material. This may be influenced by the concentration of calcium in the acetic acid solution. In an embodiment, the porosity and high electrical conducting nature of the calcium-deposited three-dimensional carbon is efficient for enhancement of storage capacitance value.
[00059] In an embodiment, the specific capacitance value may fall in the
range of about 100 F g-1 to 700 F g-1. In an embodiment, the calcium-deposited
three-dimensional carbon possesses improved cyclic stability and power
deliverable capacity. In an embodiment, the process of the present invention is
industrially scalable and is suitable even during economic escalations.
[00060] In an embodiment, the present disclosure provides a calcium-
deposited three-dimensional carbon for storing energy obtained by a process comprising the steps of: (a) collecting and cleaning waste paper with a chemical reagent to remove hydrophobic impurities, (b) treating the waste paper of step (a) with acetic acid to give cellulose pulp, (c) collecting and treating eggshells with sodium oxychloride to give clean eggshells, (d) drying followed by grinding the clean eggshells to give powdered eggshells, (e) adding the powdered eggshells to the cellulose pulp in acetic acid environment with constant stirring to give a uniform mixture, (f) freeze-drying the uniform mixture until removal of moisture, (g) carbonizing freeze-dried mixture under nitrogen environment to produce pre-

calcined carbon, and (h) calcinating the pre-calcined carbon under nitrogen and
hydrogen environment to give the calcium-deposited three-dimensional carbon.
[00061] In an embodiment, the carbon obtained by the process is eco-
friendly, formed by reducing the waste materials in the environment and the process
steps are reduced thereby decreasing the manufacturing costs of carbon.
[00062] Moreover, in interpreting both the specification and the claims, all
terms should be interpreted in the broadest possible manner consistent with the context. In particular, the terms "comprises" and "comprising" should be interpreted as referring to elements, components, or steps in a non-exclusive manner, indicating that the referenced elements, components, or steps may be present, or utilized, or combined with other elements, components, or steps that are not expressly referenced. Where the specification claims refer to at least one of something selected from the group consisting of A, B, C ... .and N, the text should be interpreted as requiring only one element from the group, not A plus N, or B plus N, etc.
[00063] While some embodiments of the present disclosure have been
illustrated and described, those are completely exemplary in nature. The disclosure is not limited to the embodiments as elaborated herein only and it would be apparent to those skilled in the art that numerous modifications besides those already described are possible without departing from the inventive concepts herein. All such modifications, changes, variations, substitutions, and equivalents are completely within the scope of the present disclosure. The inventive subject matter, therefore, is not to be restricted except in the spirit of the appended claims.
ADVANTAGES OF THE INVENTION
[00064] The present disclosure provides a process of preparing a calcium-
deposited three-dimensional carbon with improved cyclic stability and power deliverable capacity.
[00065] The present disclosure provides a process of preparing a calcium-
deposited three-dimensional carbon that consumes waste materials thereby contributing ecologically.

[00066] The present disclosure provides an efficient, cost-effective process
of preparing calcium-deposited three-dimensional carbon.
[00067] The process of the present disclosure produces carbon that has high
capacitance performance and energy density.

We Claim:

1. A process of preparing calcium-deposited three-dimensional (3D) carbon for
storing energy, wherein the process comprising:
cleaning one or more waste papers using a chemical reagent to remove one or more hydrophobic impurities in the one or more waste papers;
treating the cleaned one or more waste papers using an acetic acid to convert the one or more waste papers into a cellulose pulp;
treating one or more eggshells with a sodium oxychloride to clean the one or more eggshells;
drying and subsequently grinding the cleaned one or more eggshells into powdered eggshells;
mixing the powdered eggshells with the cellulose pulp treated in the acetic acid, by constantly stirring to produce uniform mixture of the powdered eggshells and the cellulose pulp;
freeze-drying the uniform mixture until moisture is removed from the uniform mixture;
carbonating the freeze-dried uniform mixture under nitrogen environment to obtain pre-calcined carbon; and
calcinating the pre-calcined carbon under nitrogen environment and hydrogen environment to obtain the calcium-deposited three-dimensional (3D) carbon.
2. The process as claimed in claim 1, wherein the chemical reagent is at least one of an acetone, an ethanol, and a 2-propanol.
3. The process as claimed in claim 1, wherein cleaning one or more waste papers using the chemical agent removes all hydrophobic impurities comprising at least one of a color, an adhesive, an ink, a food oil, a food waste, a dust, and a mud.
4. The process as claimed in claim 1, wherein mixing the powdered eggshells with the cellulose pulp treated in the acetic acid forms a gel due to the presence of calcium acetate and cellulose pulp, wherein, mixing the powdered eggshells

with the cellulose pulp treated in the acetic acid is carried out at a temperature of about 80°C, wherein carbonating is carried out at a temperature of 600°C for 6 to 12 hours of time, and wherein calcinating is carried out at a temperature of 900°C, wherein the carbonating time is based on the quality of the cellulose pulp.
5. The process as claimed in claim 1, wherein, the calcium-deposited three-dimensional carbon is fabricated into electrode, and wherein, the calcium-deposited three-dimensional (3D) carbon further comprises heavy elements originated from the waste paper, wherein the heavy elements is at least one of a cadmium, a chromium, a lead, and a mercury.
6. A method of producing calcium-deposited three-dimensional (3D) carbon for storing energy, wherein the production method comprising:
cleaning one or more waste papers using a chemical reagent to remove one or more hydrophobic impurities in the one or more waste papers;
treating the cleaned one or more waste papers using an acetic acid to convert the one or more waste papers into a cellulose pulp;
treating one or more eggshells with a sodium oxychloride to clean the one or more eggshells;
drying and subsequently grinding the cleaned one or more eggshells into powdered eggshells;
mixing the powdered eggshells with the cellulose pulp treated in the acetic acid, by constantly stirring to produce uniform mixture of the powdered eggshells and the cellulose pulp;
freeze-drying the uniform mixture until moisture is removed from the uniform mixture;
carbonating the freeze-dried uniform mixture under nitrogen environment to obtain pre-calcined carbon; and
calcinating the pre-calcined carbon under nitrogen environment and hydrogen environment to obtain the calcium-deposited three-dimensional (3D) carbon.

7. The production method as claimed in claim 6, wherein the chemical reagent is at least one of an acetone, an ethanol, and a 2-propanol,
8. The production method as claimed in claim 6, wherein cleaning one or more waste papers using the chemical agent removes all hydrophobic impurities comprising at least one of a color, an adhesive, an ink, a food oil, a food waste, a dust, and a mud.
9. The production method as claimed in claim 6, wherein mixing the powdered eggshells with the cellulose pulp treated in the acetic acid forms a gel due to the presence of calcium acetate and cellulose pulp, wherein, mixing the powdered eggshells with the cellulose pulp treated in the acetic acid is carried out at a temperature of about 80°C, wherein carbonating is carried out at a temperature of 600°C for 6 to 12 hours of time, and wherein calcinating is carried out at a temperature of 900°C, wherein the carbonating time is based on the quality of the cellulose pulp.
10. The production method as claimed in claim 6, wherein, the calcium-deposited three-dimensional carbon is fabricated into electrode, and wherein, the calcium-deposited three-dimensional (3D) carbon further comprises heavy elements originated from the waste paper, wherein the heavy elements is at least one of a cadmium, a chromium, a lead, and a mercury.
11. A calcium-deposited three-dimensional carbon for storing energy obtained by a process as claimed in claims 1-5.