High energy density supercapacitors from lignin derived submicron activated carbon fibers in aqueous electrolytes
High energy density supercapacitors from lignin derived submicron activated carbon fibers in aqueous electrolytes
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DOI：
10.1016/j.jpowsour.2014.07.063
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发表时间：
2014-12-15
影响因子：
9.2
通讯作者：
Hsieh, You-Lo
中科院分区：
文献类型：
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作者：
Hu, Sixiao;Zhang, Sanliang;Hsieh, You-Lo
以低磺化碱木质素为原料，制备了高孔隙率的亚微米活性炭纤维（ACF），并将其制成超级电容器。亲水性和高比表面积的活性炭纤维显示出大尺寸的纳米石墨和良好的导电性，表现出优异的电化学性能。特别是，KOH活化的ACF在水溶液电解质中的低1.8 mg cm（-2）质量负载和10 mV s（-1）扫描速率下显示出非常高的344 F g（-1）比电容。即使在50 mV s（-1）的相对高的扫描速率和10 mg cm（-2）的质量负载下，也获得了196 F g（-1）的可观的比电容和0.55 F cm（-2）的显著的面电容，导致基于平均电极质量的8.1 Wh kg（-1）的高能量密度。此外，在5000次充电/放电循环后，实现了超过96%的电容保持率。这种优异的性能证明了木质素衍生碳用于电能储存的巨大潜力。(C)2014爱思唯尔有限公司版权所有。
Highly porous submicron activated carbon fibers (ACFs) were robustly generated from low sulfonated alkali lignin and fabricated into supercapacitors for capacitive energy storage. The hydrophilic and high specific surface ACFs exhibited large-size nanographites and good electrical conductivity to demonstrate outstanding electrochemical performance. ACFs from KOH activation, in particular, showed very high 344 F g(-1) specific capacitance at low 1.8 mg cm(-2) mass loading and 10 mV s(-1) scan rate in aqueous electrolytes. Even at relatively high scan rate of 50 mV s(-1) and mass loading of 10 mg cm(-2), a decent specific capacitance of 196 F g(-1) and a remarkable areal capacitance of 0.55 F cm(-2) was obtained, leading to high energy density of 8.1 Wh kg(-1) based on averaged electrodes mass. Furthermore, over 96% capacitance retention rates were achieved after 5000 charge/discharge cycles. Such excellent performance demonstrated great potential of lignin derived carbons for electrical energy storage. (C) 2014 Elsevier B.V. All rights reserved.