ISSN 1003-9953
能源化学(英文) 2017, Vol. 26 Issue (1) :121-128    DOI: 10.1016/j.jechem.2016.08.005
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Effect of the pore length and orientation upon the electrochemical capacitive performance of ordered mesoporous carbons
Anran Huanga,b,c, Jingwang Yana,b, Hongzhang Zhanga,b, Xianfeng Lia,b, Huamin Zhanga,b
a Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, Liaoning, China;
b Dalian National Laboratory for Clean Energy, Dalian 116023, Liaoning, China;
c University of Chinese Academy of Sciences, Beijing 100049, China
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摘要 By utilizing hard template method to adjust the mesopore length, and alkali activation to generate micropores, two hierarchical porous carbons (HPCs) were prepared. With controlling of their mesopore length and the activation conditions, the complex system composed by HPCs and electrolyte was simplified and the effect of mesopore length on the performance of HPCs as electrodes in supercapacitors was investigated. It is found that with the mesopore length getting smaller, the ordered area gets smaller and the aggregation occurs, which is caused by the high surface energy of small grains. HPC with long pores (HPCL) exhibits a donut-like morphology with well-defined ordered mesopores and a regular orientation while in HPC with short pores (HPCS), short mesopores are only orderly distributed in small regions. Longer ordered channels form unobstructed ways for ions transport in the particles while shorter channels, only orderly distributed in small areas, results in blocked paths, which may hinder the electrolyte ions transport. Due to the unobstructed structure, HPCL exhibits good rate capability with a capacitance retention rate over 86% as current density increasing from 50 mA/g to 1000 mA/g. The specific capacitance of HPCL derived from the cyclic voltammetry test at 10 mV/s is up to 201.72 F/g, while the specific capacitance of HPCS is only 193.65 F/g.
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关键词Supercapacitor   Hierarchical porous carbon   Ordered mesoporous carbon   Hard template     
收稿日期: 2016-07-22; 发布日期: 2016-08-28

The authors gratefully acknowledge financial support from the Natural Science Foundation of China (no. 51177156/E0712).

通讯作者 Jingwang Yan, Huamin Zhang     Email: yanjw@dicp.ac.cn;zhanghm@dicp.ac.cn
.Effect of the pore length and orientation upon the electrochemical capacitive performance of ordered mesoporous carbons[J]  能源化学(英文) , 2017,V26(1): 121-128
.Effect of the pore length and orientation upon the electrochemical capacitive performance of ordered mesoporous carbons[J]  Journal of Energy Chemistry, 2017,V26(1): 121-128
http://www.jenergchem.org/CN/10.1016/j.jechem.2016.08.005     或     http://www.jenergchem.org/CN/Y2017/V26/I1/121
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