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In situ coating nickel organic complexes on free-standing nickel wire films for volumetric-energy-dense supercapacitors. 2018

Min Hong, and Shusheng Xu, and Lu Yao, and Chao Zhou, and Nantao Hu, and Zhi Yang, and Jing Hu, and Liying Zhang, and Zhihua Zhou, and Hao Wei, and Yafei Zhang
Key Laboratory for Thin Film and Microfabrication Technology of the Ministry of Education, School of Electronics Information and Electrical Engineering, Shanghai Jiao Tong University, Dong Chuan Road No.800, Shanghai, 200240, People's Republic of China.

A self-free-standing core-sheath structured hybrid membrane electrodes based on nickel and nickel based metal-organic complexes (Ni@Ni-OC) was designed and constructed for high volumetric supercapacitors. The self-standing Ni@Ni-OC film electrode had a high volumetric specific capacity of 1225.5 C cm-3 at 0.3 A cm-3 and an excellent rate capability. Moreover, when countered with graphene-carbon nanotube (G-CNT) film electrode, the as-assembled Ni@Ni-OC//G-CNT hybrid supercapacitor device delivered an extraordinary volumetric capacitance of 85 F cm-3 at 0.5 A cm-3 and an outstanding energy density of 33.8 at 483 mW cm-3. Furthermore, the hybrid supercapacitor showed no capacitance loss after 10 000 cycles at 2 A cm-3, indicating its excellent cycle stability. These fascinating performances can be ascribed to its unique core-sheath structure that high capacity nano-porous nickel based metal-organic complexes (Ni-OC) in situ coated on highly conductive Ni wires. The impressive results presented here may pave the way to construct s self-standing membrane electrode for applications in high volumetric-performance energy storage.

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