超级电容器
材料科学
煅烧
阳极
化学工程
电解质
碳纤维
多孔性
电容
比表面积
电极
储能
纳米技术
催化作用
化学
复合材料
有机化学
量子力学
复合数
物理
工程类
物理化学
功率(物理)
作者
Shasha Gao,Yakun Tang,Lei Wang,Lang Liu,Zhipeng Sun,Shan Wang,Hongyang Zhao,Lingbing Kong,Dianzeng Jia
标识
DOI:10.1021/acssuschemeng.7b03421
摘要
Coal-based multiscale porous carbon materials (CPCs) have been successfully fabricated through a friendly method with NaCl, Na2CO3, and Na2SiO3 as structural templates, instead of alkali activation at a relatively low temperature. The method includes freeze-drying and calcination of salts/acid-treated coal, combined with water washing to remove salts. The optimal product (CPCs-20) obtained by the above procedure displayed a high surface area of 1100 m2 g–1. As electrode materials of supercapacitors, CPCs-20 presented a specific capacitance of 304 F g–1 at 1 A g–1 and superior stability over 10,000 cycles at 4 A g–1 owing to its hierarchical porosity with higher surface area, promoted diffusion of electrolyte, and increased conductivity. It is also worth mentioning that a symmetric device based on CPCs-20 can light a light-emitting diode (LED) for 30 min. Furthermore, CPCs-20 as the anode for Li-ion batteries exhibited a high reversible capacity of 450 mA h g–1 at 0.2 A g–1, excellent rate capability, and outstanding cycling performance. Therefore, there are bright prospects of our CPCs as high performance electrode material for energy storage applications.
科研通智能强力驱动
Strongly Powered by AbleSci AI