Porous wood carbon monolith for high-performance supercapacitors
Porous wood carbon monolith for high-performance supercapacitors
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用于高性能超级电容器的多孔木质碳整料
DOI：
10.1016/j.electacta.2011.11.100
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发表时间：
2012-01-15
影响因子：
6.6
通讯作者：
Kang, Long
中科院分区：
文献类型：
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作者：
Liu, Mao-Cheng;Kong, Ling-Bin;Kang, Long
通过对杨木进行碳化处理，并用硝酸溶液进行表面改性，成功合成了一种高稠度、大孔隙率的表面改性多孔木质碳整料（m-WCM）。获得的 m-WCM 的孔特性，包括这些活性炭的 BET 表面积、孔体积和孔径分布，通过 N-2 吸附等温线进行表征。通过傅里叶变换红外光谱对表面官能团进行了表征。通过扫描电子显微镜（SEM）和透射电子显微镜（TEM）对表面形态和微观结构进行物理表征。所得的 m-WCM 作为超级电容器的电极进行了研究，与典型的活性炭（AC）和有序介孔碳（CMK-3）相比，表现出优异的电化学性能。系统研究了改性条件对超级电容行为的影响，在2 M KOH溶液中获得了最大重量电容（C-m）和体积电容（C-v）分别为234 Fg(-1)和36 F cm(-3)。长期循环实验显示出优异的稳定性，在10 mA cm(-2) 下进行2000次恒电流循环后，初始电容值降低了3%。 (C) 2011 Elsevier Ltd. 保留所有权利。
A surface modified porous wood carbon monolith (m-WCM) with high consistency and large porosity was successfully synthesized by carbonization of poplar wood and subsequent surface modification with HNO3 solution. The pore properties of obtained m-WCM, including the BET surface area, pore volume, and pore size distribution of these activated carbons were characterized by the N-2 adsorption isotherms. The surface functional groups were characterized by Fourier transform infrared spectroscopy. Surface morphology and microstructure were physically characterized by scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The obtained m-WCM was studied as electrodes for supercapacitors and exhibited excellent electrochemical performance compared with typical activated carbon (AC) and ordered mesoporous carbon (CMK-3). The effects of modification conditions on supercapacitive behavior were systematically studied, a maximum gravimetric capacitance (C-m) and volumetric capacitance (C-v) of 234 Fg(-1) and 36 F cm(-3) were obtained in 2 M KOH solution. Long-term cycling experiments showed excellent stability with a reduction of the initial capacitance values of 3% after performing 2000 galvanostatic cycles at 10 mA cm(-2). (C) 2011 Elsevier Ltd. All rights reserved.