超级电容器
介孔材料
材料科学
煅烧
拉曼光谱
胡须
电容
碳化
碳纤维
化学工程
水平扫描速率
电极
X射线光电子能谱
兴奋剂
纳米技术
扫描电子显微镜
循环伏安法
复合材料
电化学
复合数
化学
催化作用
光电子学
有机化学
物理化学
工程类
物理
光学
作者
Xinlong Ma,Ning Gao,Yanfang Kan,Yiming Ma,Chuanlei Qi,Bing Chen,Yongfeng Li,Xingying Lan,Jinsen Gao
标识
DOI:10.1016/j.electacta.2014.10.128
摘要
S-doped mesoporous carbon fibres with an S content as high as 14.0 atom % (29.4 wt. %) are synthesized by carbonization of sucrose using MgSO4-containing porous whiskers as templates and S source. The ultrahigh S concentration is obtained at an optimized condition, including a calcination temperature of 600 °C, whisker templates with a smaller diameter and a relatively lower carbon source to template ratio (1:5). X-ray photoelectron spectroscopy demonstrates that the bonding configurations of S are mainly assigned to thiophene-S (C-S-C). Raman spectra demonstrate that the amount of defects rise with the increase of S content. As electrodes for supercapacitors, the specific capacitance of the S-doped mesoporous carbon fibres significantly increases as the S content increasing, reaching 221 F g−1 at the scan rate of 10 mV s−1 with an area-normalized capacitance of 38 μF cm−2. And the capacitance retention maintains 95% even after 500 cycles, exhibiting excellent cycling stability. Our results indicate that S-doped mesoporous carbons with ultrahigh S concentration can be potential candidates as high quality electrode materials for supercapacitors.
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