Porous CoO nanostructures grown on three-dimension graphene foams for supercapacitors electrodes
Porous CoO nanostructures grown on three-dimension graphene foams for supercapacitors electrodes
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DOI：
10.1016/j.apsusc.2014.03.107
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发表时间：
2014-06
影响因子：
6.7
通讯作者：
Weiyuan Deng;W. Lan;Yaru Sun;Q. Su;E. Xie
中科院分区：
文献类型：
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作者：
Weiyuan Deng;W. Lan;Yaru Sun;Q. Su;E. Xie
采用化学气相沉积法制备了导电性好、重量轻、化学稳定性好的三维石墨烯泡沫。然后通过简单的水热法和后续的热处理在泡沫石墨烯上沉积多孔CoO纳米壁。这种混合结构具有较大的表面积，其中CoO纳米壁由石墨烯泡沫分离，具有强大的附着力，可以直接用作超级电容器电极，包括集流器，而不需要任何其他粘合剂材料和导电剂。电化学测试表明，在1 a /g电流下，其比电容达到231.87 F/g（按CoO质量计为139.47 F/g，电极总质量为139.47 F/g），具有良好的倍率性能，在7 a /g电流下，循环1000次，电容保持率达到98%。高导电性、轻质量和合理的结构，提供了快速的电子路径和低离子扩散阻力，是电极高性能的原因。
Three-dimensional graphene foams with good conductivity, light weight and chemical stability were produced by chemical vapor deposition. Then porous CoO nanowalls were deposited on graphene foam by a simple hydrothermal process and subsequent thermal treatment. This hybrid structures possessing large surface area in which the CoO nanowalls are separated by graphene foam with robust adhesion can directly serve as supercapacitor electrode including current collector without the need of any other binder materials and conductive agents. Electrochemical tests manifest a high specific capacitance of 231.87 F/g scaled to the mass of CoO (139.47 F/g for total mass of electrodes) at 1 A/g current, good rate capability and excellent cycling performance of >98% capacitance retention over 1000 cycles at 7 A/g current. The high conductivity, light weight and rational architectures, which provide fast electron pathway and the low diffusion resistance of ions, are responsible for the high performance of the electrodes.