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Flour food waste derived activated carbon for high-performance supercapacitors

机译:面粉食物残渣衍生的活性炭,用于高性能超级电容器

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摘要

It is of great importance to develop electrode materials at a low cost for constructing high-performance electrochemical energy storage systems. Herein, we employed flour food waste residue as a raw material to prepare porous carbon based supercapacitor electrodes through the carbonization and subsequent KOH activation process. The as-prepared biomass-derived activated carbon exhibits an interconnected porous network with numberous open micropores and appropriate mesopores. Meanwhile, its moderate total pore volume results in a high mass density of 0.86 g cm(-3). When used as supercapacitor electrodes in an aqueous solution of KOH (6 mol L-1), the porous carbon material shows a high specific capacitance (278 F g(-1), 241 F cm(-3)) and good cycling stability with 95% capacitance retention over 3000 cycles at a current density of 2 A g(-1). Furthermore, even at an ultrahigh current density of 100 A g(-1) (charge/discharge completed within 3 s), it still maintains a high specific capacitance of 142 F g(-1) (122 F cm(-3)).
机译:以低成本开发用于构建高性能电化学能量存储系统的电极材料非常重要。本文中,我们以面粉食物残渣为原料,通过碳化和随后的KOH活化过程制备了多孔碳基超级电容器电极。所制备的源自生物质的活性炭表现出具有多个开放的微孔和合适的中孔的互连多孔网络。同时,其适中的总孔体积导致0.86 g cm(-3)的高质量密度。当在KOH(6 mol L-1)的水溶液中用作超级电容器电极时,多孔碳材料显示出高的比电容(278 F g(-1),241 F cm(-3))和良好的循环稳定性,在2 A g(-1)的电流密度下,在3000次循环中95%的电容保持率。此外,即使在100 A g(-1)的超高电流密度下(在3 s内完成充电/放电),它仍保持142 F g(-1)(122 F cm(-3))的高比电容。 。

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