超级电容器
电容
材料科学
电解质
电极
介孔材料
热解
电容感应
碳纤维
化学工程
纳米技术
化学
复合材料
有机化学
电气工程
工程类
物理化学
催化作用
复合数
作者
Yu Fang,Zihan Ye,Wanru Chen,Qianya Wang,Hui Wang,Honglei Zhang,Chuang Peng
标识
DOI:10.1016/j.apsusc.2019.145190
摘要
Wide potential range and high specific capacitance of electrode materials are critical to high performance supercapacitors. However, it remains challenging to simultaneously achieve both high capacitance and cell voltage, particularly in organic electrolytes. Herein, three dimensional (3D) mesopore-dominant hierarchical carbons are obtained by one-step pyrolysis-activation of seasonable biowaste, i.e., plane tree bark with nano-ZnO as a mild activator. The optimized biowaste-derived carbon shows an ultrahigh mesopore area and low oxygen content. With these merits, the carbon electrodes show both high capacitance and wide capacitive potential range in both aqueous and organic electrolyte. Particularly, a specific capacitance of 115.6F g−1 and a high cell voltage of 3 V are achieved with organic electrolyte. This study also reveals a mismatch between the specific capacitance and four commonly used specific surface area values. In a symmetrical supercapacitor with organic electrolyte, the positive electrode is the voltage-determining electrode. These findings may provide new perspectives on materials and device design of high-voltage supercapacitors.
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