生物炭
超级电容器
阳极
电容
阴极
电池(电)
电极
电流密度
功率密度
电导率
复合数
材料科学
比表面积
化学
化学工程
复合材料
电化学
热解
工程类
物理
物理化学
功率(物理)
催化作用
量子力学
生物化学
作者
Bo Ren,Xiaoe Wang,Xin Zhang,Bo Wang,Yan Li,Xu Zeng,Xiaofei Zhang,Meiqing Fan,Xiaodong Yang
标识
DOI:10.1016/j.jallcom.2022.168403
摘要
Cornstalk biochar (CB) has a highly hollow and porous structure, which can provide large specific surface area, shorten the ion transport path, facilitate rapid charge transmission and enhance the material conductivity. In this paper, core-shell NiCo2S4 @NiMoO4 arrays supported on the surface of cornstalk biochar ([email protected]) were prepared. The combination of NiCo2S4 @NiMoO4 and cornstalk biochar removes the poor conductivity limitations of NiCo2S4 @NiMoO4. At the same time, synergistic effects significantly widen the operating potential window of the composite and enhance the energy density. The electrode material has excellent electrochemical properties (1447 F·g−1 at the current densities of 5 mA·cm−2) and good stability (specific capacitance reduction limited to 12% after 10,000 cycles). A [email protected]//CB supercapacitor was fabricated using [email protected] as cathode, CB as anode and nickel foam as current collector. This device has a high energy density (78.23 Wh·kg−1 at 184.49 W·kg−1) and good stability (the specific capacitance decreased by only 20% after 10,000 cycles). Two identical devices connected in parallel can power a red LED (1.8 V) for 30 min.
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