超级电容器
电容
电解质
碳纤维
材料科学
化学工程
活性炭
多孔性
水溶液
介孔材料
纳米技术
比表面积
化学
电极
有机化学
催化作用
复合材料
吸附
工程类
复合数
物理化学
作者
Ping Kwong Cheng,Shuangyan Gao,Peiyu Zang,Xiaofan Yang,Yonglong Bai,Hua Xu,Zong‐Huai Liu,Zhibin Lei
出处
期刊:Carbon
[Elsevier]
日期:2015-11-01
卷期号:93: 315-324
被引量:403
标识
DOI:10.1016/j.carbon.2015.05.056
摘要
We present a facile yet effective two-step activation method to prepare a hierarchically porous carbon with natural shiitake mushroom as the starting materials. The first step involves the activation of shiitake mushroom with H3PO4, while the second step is to further activate the product with KOH. The resulting carbon is comprised of abundant micro-, mesopores and interconnected macropores that has a specific surface area up to 2988 m2 g−1 and pore volume of 1.76 cm3 g−1. With the unique porous nature, the carbon exhibited a specific capacitance of 306 and 149 F g−1 in aqueous and organic electrolyte, respectively. Moreover, this carbon also shows a high capacitance retention of 77% at large current density of 30 A g−1 and exhibited an outstanding cycling stability with 95.7% capacitance preservation after 15,000 cycles in 6 M KOH electrolyte. The far superior performance as compared with those of the commercially most used activated carbon RP20 in both aqueous and non-aqueous electrolyte demonstrates its great potential as high-performance supercapacitor electrode. The two-step method developed herein also represents a very attractive approach for scalable production of various functional carbon materials using diverse biomasses as starting materials.
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