Effect of freezing pretreatment on the performance of activated carbon from coconut shell for supercapacitor application

“…Direct carbonization of plant tissue (such as hazelnut shell, [ 64 ] coconut shell, [ 65 ] watermelon rind, [ 66 ] straw, [ 67 ] bamboo, [ 68 ] sawdust, [ 69 ] leaves, [ 70 ] flowers, [ 71 ] seeds, [ 72 ] walnut septum, [ 73 ] sodium alginate, [ 74 ] etc.) or animal wastes is also an approach to prepare porous carbon.…”

Section: Ac‐based Electrode Materialsmentioning

confidence: 99%

Carbon Nanomaterials‐Enabled High‐Performance Supercapacitors: A Review

Zhao

Liu

et al. 2022

Adv Energy and Sustain Res

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Supercapacitors (SCs), an important kind of electrochemical energy storage device, are featured with high power density, rapid charging and discharging, and ultralong cycling lifespan and have been widely applied in multiscenario energy storage and output systems, such as portable consumer electronics, electric vehicles, and reservoir setups for green and sustainable energy resources. Among their components, electrode materials are of primary importance in dictating their performances. Owing to good electric conductivity, achievably large specific surface area, low cost, chemical stability, and easy loading with other electrochemically active species, various carbon nanomaterials, including activated carbons, carbon nanotubes, graphene, and other porous carbons, are promising electrode materials in the fabrication of high-performance SCs. In fact, the past decade has witnessed enormous efforts in the development of highperformance carbon-based SC electrode materials and great progresses achieved in the field. In this review, recent advances on these carbon-based SCs are summarized through a number of selected representative works. In each one, the unique preparation method, structural features, and their correlations to electrochemical properties and final SC performance are presented and discussed. At the end of the review, the challenges and future developing prospects are briefly outlined.

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“…[2] At present, more than 80 % of commercial supercapacitors are still made of activated carbon (AC) electrodes. [3] Biomass wastes have become the exclusive precursors of commercial AC applied in supercapacitors due to diverse sources, renewable and low cost, [4] such as coconut shells, [5] fungi on lignocellulosic fibers, [6] pomelo peels, [7] cotton [8] and cotton stalks. [9] Recently, the one-step molecular level activation method has been developed to obtain higher-performance ACs with lower energy consumption.…”

Section: Introductionmentioning

confidence: 99%

High Yield and High Volumetric Capacitance Activated Carbons by One‐step Homogeneous Activation of Diaphragma Juglandis Fructus for Supercapacitors

Wen,

Deng,

et al. 2023

ChemistrySelect

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Diaphragma juglandis fructus (DJF) is selected as a precursor of activated carbon (AC). Saturated absorption of solution containing desirable amount of KOH in DJF leads to one‐step homogeneous activation which produces AC‐1 comprising non‐honeycombed smaller particles with lower energy consumption compared with AC‐2 by the conventional two‐step method. The non‐honeycombed morphology of AC‐1 results in a high yield of 24.2 % and a high packing density of 0.78 g cm−3. Although the specific surface area of AC‐1 is only 1030 m2 g−1, the specific capacitance reaches 244 F g−1 at 0.5 A g−1 in 6 mol L−1 KOH in a three‐electrode cell, higher than that of AC‐2 due to the reasonable pore distribution. In a symmetrical supercapacitor with the 6 mol L−1 KOH electrolyte, the maximum specific cell capacitance is 58.1 F g−1 at 0.25 A g−1, corresponding to a high volumetric capacitance of 181 F cm−3 for a single electrode. The flexible supercapacitor with PVA/KOH electrolyte shows areal capacitance of 637 mF cm−2 and can maintain 70 % of the initial value after 180° bending for 400 times. The AC‐1 cell with the ionic liquid electrolyte has a maximum specific energy of 30.6 Wh kg−1, which can illuminate 16 light‐emitting diodes simultaneously.

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Effect of freezing pretreatment on the performance of activated carbon from coconut shell for supercapacitor application

Cited by 16 publications

References 13 publications

Facile and sustainable technique to produce low-cost high surface area mangosteen shell activated carbon for supercapacitors applications

Facile and sustainable technique to produce low-cost high surface area mangosteen shell activated carbon for supercapacitors applications

Carbon Nanomaterials‐Enabled High‐Performance Supercapacitors: A Review

High Yield and High Volumetric Capacitance Activated Carbons by One‐step Homogeneous Activation of Diaphragma Juglandis Fructus for Supercapacitors

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