High-power supercapacitors based on hierarchical porous nanometer-sized silicon carbide-derived carbon

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• 作者：Pengtao Yan^a ; Jiang Xu^a ; ^b ; Chao Wu^a ; ^c ; Yu Gu^a ; ^d ; Xuesha Zhang^a ; Ruijun Zhang^a ; ^{zhangrj@ysu.edu.cn" class="auth_mail" title="E-mail the corresponding author} ; Yibo Song^a
• 关键词：Nanometer carbon material ; Carbide-derived carbon ; Pore structure ; Supercapacitor ; High rate performance
• 刊名：Electrochimica Acta
• 出版年：2016
• 出版时间：20 January 2016
• 年：2016
• 卷：189
• 期：Complete
• 页码：16-21
• 全文大小：1842 K

文摘

The nanoscale microporous carbide-derived carbon (nano-CDC) is synthesized by chlorination of silicon carbide nano-powder with a particle diameter around 60 nm and further pore-tuned by KOH activation with different KOH/nano-CDC ratios. Based on the higher specific surface area (SSA), a hierarchical micro- and meso-pore structure (especially for the greatly produced mesopores), and the shorter inherent ion transport distance within porous nano-carbons, the KOH-activated nano-CDC exhibits superior supercapacitive performances. Its specific capacitance is up to 141 F g⁻¹, 156% increase compared with that of pristine nano-CDC (54 F g⁻¹). Most interestingly, the cyclic voltammogram curve of the activated nano-CDC can keep a rectangular-like shape even at a scan rate of 5000 mV s⁻¹, exhibiting significantly better power performance. This work confirms that constructing favorable pore structure in nanometer-sized porous carbons is an effective strategy for fabricating high-power supercapacitors.