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Construction of Iron/cobalt Disulfides Nanoparticles Anchored on Biomass-Derived Hierarchically Porous Carbon for Hybrid Supercapacitors with Ultrahigh Energy Density

JOURNAL OF ALLOYS AND COMPOUNDS(2023)

Dalian Polytech Univ | Dalian Branch

Cited 6|Views21
Abstract
The rational design and preparation of cathode and anode materials with high capacitance within both positive and negative potential windows for hybrid supercapacitors remains a great challenge. Herein, a hybrid supercapacitor with ultrahigh energy density is assembled with biomass-derived iron/cobalt dis-ulfides immobilized on porous carbon (FeS2/CoS2 @KC) and N, S co-doped porous carbon (NSKC) as cathode and anode materials. These two electrode materials are prepared by a facile impregnation and pyrolysis method. FeS2/CoS2 @KC-80 0 cathode material exhibits excellent electrochemical performance with a su-perior specific capacitance of 3480.47 F g-1 at 0.5 A g-1 and high capacitance retention of 60.35% at 15 A g-1. NSKC-80 0 anode material delivers a high specific capacitance of 268.75 F g-1 at 0.5 A g-1. Remarkably, the assembled hybrid supercapacitor outputs an ultrahigh energy density of 200.20 Wh kg-1 at a power density of 463.19 W kg-1. Moreover, it also possesses remarkable cycling stability with improved capacitance re-tention of 94.79% after 10,000 cycles at 5 A g-1. This work demonstrates that kelp is a promising precursor to construct high-performance electrode materials for energy storage applications.(c) 2022 Published by Elsevier B.V.
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Hybrid supercapacitor,Biomass,FeS2,CoS2@KC,S co-doped porous carbon
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要点】:本研究通过将铁/钴二硫化物纳米颗粒锚定在生物基分级多孔碳上,成功制备出具有超高能量密度的混合超级电容器电极材料,实现了高性能的能量存储。

方法】:采用简单的浸渍和热解方法制备了生物基铁/钴二硫化物/多孔碳复合材料和氮、硫共掺杂的多孔碳材料。

实验】:通过电化学测试,FeS2/CoS2 @KC-800作为电极材料在0.5 A g^-1下展现了3480.47 F g^-1的高比电容和15 A g^-1下60.35%的电容保持率;NSKC-800作为电极材料在0.5 A g^-1下达到268.75 F g^-1的比电容。组装的混合超级电容器在463.19 W kg^-1的功率密度下输出200.20 Wh kg^-1的超高能量密度,并在10,000个循环后保持94.79%的电容保持率。实验数据集名称未在文中提及。