Sakura-based activated carbon preparation and its performance in supercapacitor applications

Ma, Fang; Shaolan, Ding; Ren, Huijun; Liu, Yanhua

doi:10.1039/c8ra09685f

Cited by 106 publications

(41 citation statements)

References 55 publications

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“…[ 25,23 ] The Helmholtz model is the simplest model to describe this process as double‐layer capacitance using the equation for a parallel plate capacitor

\begin{matrix} C = \frac{ε A}{d} \end{matrix}

where C is the double‐layer capacitance, ε is the permittivity of the dielectric separating the charges, A is the surface area of the electrode, and d is the distance between the electrode and electrolyte ions. Typically, carbon‐based porous materials such as activated carbon, [ 26–28 ] xerogels, [ 29–32 ] carbon nanotubes (CNTs), [ 33–35 ] carbon nanofibers (CNFs), [ 36–38 ] graphene, [ 39–41 ] and carbide‐derived carbons [ 42–44 ] show EDLC type behavior owing to their high specific surface area and good conductivity. The charge/discharge process in EDLCs is associated with the purely non‐Faradaic reactions; thus, responds immediately to potential changes.…”

Section: Details Of Charge Storing Mechanismsmentioning

confidence: 99%

True Meaning of Pseudocapacitors and Their Performance Metrics: Asymmetric versus Hybrid Supercapacitors

Chodankar

Pham

Kumar

et al. 2020

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The development of pseudocapacitive materials for energy‐oriented applications has stimulated considerable interest in recent years due to their high energy‐storing capacity with high power outputs. Nevertheless, the utilization of nanosized active materials in batteries leads to fast redox kinetics due to the improved surface area and short diffusion pathways, which shifts their electrochemical signatures from battery‐like to the pseudocapacitive‐like behavior. As a result, it becomes challenging to distinguish “pseudocapacitive” and “battery” materials. Such misconceptions have further impacted on the final device configurations. This Review is an earnest effort to clarify the confusion between the battery and pseudocapacitive materials by providing their true meanings and correct performance metrics. A method to distinguish battery‐type and pseudocapacitive materials using the electrochemical signatures and quantitative kinetics analysis is outlined. Taking solid‐state supercapacitors (SSCs, only polymer gel electrolytes) as an example, the distinction between asymmetric and hybrid supercapacitors is discussed. The state‐of‐the‐art progress in the engineering of active materials is summarized, which will guide for the development of real‐pseudocapacitive energy storage systems.

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“…[ 25,23 ] The Helmholtz model is the simplest model to describe this process as double‐layer capacitance using the equation for a parallel plate capacitor

\begin{matrix} C = \frac{ε A}{d} \end{matrix}

Section: Details Of Charge Storing Mechanismsmentioning

confidence: 99%

True Meaning of Pseudocapacitors and Their Performance Metrics: Asymmetric versus Hybrid Supercapacitors

Chodankar

Pham

Kumar

et al. 2020

Small

556

299

View full text Add to dashboard Cite

show abstract

“…More to this, activating chemicals used during chemical activation act as the dehydrating agent, which inhibits the formation of tar and thus reduce the production of other volatile products. As a result, high yield carbon with very high surface area and well-developed porosity can be obtained [17][18][19][20].…”

Section: Introductionmentioning

confidence: 99%

Rice Husk-Derived High Surface Area Nanoporous Carbon Materials with Excellent Iodine and Methylene Blue Adsorption Properties

Shrestha

Thapa

Shrestha

et al. 2019

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Iodine and methylene blue adsorption properties of the high surface area nanoporous carbon materials derived from agro-waste and rice husk is reported. Rice husk was pre-carbonized at 300 °C in air followed by leaching out the silica nanoparticles by extraction with sodium hydroxide solution. The silica-free rice husk char was mixed with chemical activating agents sodium hydroxide (NaOH), zinc chloride (ZnCl2), and potassium hydroxide (KOH) separately at a mixing ratio of 1:1 (wt%) and carbonized at 900 °C under a constant flow of nitrogen. The prepared carbon materials were characterized by scanning electron microscopy (SEM), Fourier transformed-infrared spectroscopy (FT-IR), powder X-ray diffraction (pXRD), and Raman scattering. Due to the presence of bimodal micro- and mesopore structures, KOH activated samples showed high specific surface area ca. 2342 m2/g and large pore volume ca. 2.94 cm3/g. Oxygenated surface functional groups (hydroxyl, carbonyl, and carboxyl) were commonly observed in all of the samples and were essentially non-crystalline porous particle size of different sizes (<200 μm). Adsorption study revealed that KOH activated samples could be excellent material for the iodine and methylene blue adsorption from aqueous phase. Iodine and methylene blue number were ca. 1726 mg/g and 608 mg/g, respectively. The observed excellent iodine and methylene blue adsorption properties can be attributed to the well-developed micro- and mesopore structure in the carbon material. This study demonstrates that the agricultural waste, rice husk, and derived nanoporous carbon materials would be excellent adsorbent materials in water purifications.

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“…As shown in Figure 2 b, the N 2 sorption isotherm of AHC is a typical IV isotherm that is based on the IUPAC classification, suggesting a highly developed pore structure in the AHC composite [ 17 ]. The results show that the KOH activation process reduces the regularity of the pre-cellulose structure due to the formation of pores or defects [ 18 ], and the pore structure of AHC confers a higher surface area as compared to that of the non-activated HC [ 19 , 20 ]. The relatively fewer number of macropores may also be advantageous because they form a part of the carrying zone in the interconnection of the porous structure [ 4 ].…”

Section: Resultsmentioning

confidence: 99%

Graphitic Porous Carbon Derived from Waste Coffee Sludge for Energy Storage

et al. 2020

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Coffee is one of the largest agricultural products; however, the majority of the produced coffee is discarded as waste sludge by beverage manufacturers. Herein, we report the use of graphitic porous carbon materials that have been derived from waste coffee sludge for developing an energy storage electrode based on a hydrothermal recycling procedure. Waste coffee sludge is used as a carbonaceous precursor for energy storage due to its greater abundance, lower cost, and easier availability as compared to other carbon resources. The intrinsic fibrous structure of coffee sludge is based on cellulose and demonstrates enhanced ionic and electronic conductivities. The material is primarily composed of cellulose-based materials along with several heteroatoms; therefore, the waste sludge can be easily converted to functionalized carbon. The production of unique graphitic porous carbon by hydrothermal carbonization of coffee sludge is particularly attractive since it addresses waste handling issues, offers a cheaper recycling method, and reduces the requirement for landfills. Our investigations revealed that the graphitic porous carbon electrodes derived from coffee sludge provide a specific capacitance of 140 F g−1, with 97% retention of the charge storage capacity after 1500 cycles at current density of 0.3 A g−1.

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Sakura-based activated carbon preparation and its performance in supercapacitor applications

Abstract: 3D porous carbonaceous materials were prepared by combining pre-carbonization and KOH activation with sakura petals as raw materials.

Cited by 106 publications

References 55 publications

True Meaning of Pseudocapacitors and Their Performance Metrics: Asymmetric versus Hybrid Supercapacitors

True Meaning of Pseudocapacitors and Their Performance Metrics: Asymmetric versus Hybrid Supercapacitors

Rice Husk-Derived High Surface Area Nanoporous Carbon Materials with Excellent Iodine and Methylene Blue Adsorption Properties

Graphitic Porous Carbon Derived from Waste Coffee Sludge for Energy Storage

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