A sol-gel process for fabrication of NiO/NiCo2O4/Co3O4 composite with improved electrochemical behavior for electrochemical capacitors
writer：Mao-Cheng Liu, Ling-Bin Kong*, Chao Lu, Xiao-Ming Li, Yong-Chun Luo, Long Kang.
keywords：supercapacitor, mesoporous composite, mixed metal oxides, capacitive performance
source：期刊
specific source：ACS Applied Materials & Interfaces, 2012, 4(9): 4631-4636.
Issue time：2012年
Transition metal oxides possess multiple oxidation states that enable rich redox reactions for pseudo capacitanc. They have been investigated as promising electrode materials to achieve high energy density. In this study, NiO/NiCo2O4/Co3O4 composite with high specific surface and mesoporous structure is fabricated by a sol−gel process then calcined at 250 °C. Benefits from the improved electron conductivity and effective mesoporous structure, the fabricated composite exhibits high specific capacitance (1717 F g−1), enhanced rate capability, and excellent electrochemical stability (94.9% retention after 1000 cycles). Interestingly, the specific capacitance of the composite is higher than that of NiO, NiCo2O4, and Co3O4, which indicates a synergistic effect of the composite on improvement of electrochemical performance. The findings demonstrate the importance and great potential of NiO/NiCo2O4/Co3O4 composite in development of high-performance energy-storage systems.