Porous NiCo2O4 Nanowire Arrays as Supercapacitor Electrode Materials with Extremely High Cycling Stability

doi:10.1007/s40242-020-0149-4

Abstract

Abstract: In this work, NiCo₂O₄(NCO) was synthesized via microwave hydrothermal method and a further annea- ling treatment. Research results have shown that the surface defects(Co²⁺ site) and pore size of the materials can be adjusted by simply changing the calcination temperatures, and porous nanowire arrays structure can be obtained. The porous structure is conducive to the penetration of the electrolyte and enables the NCO to fully participate in the electrochemical reaction. What's more, the NCO material has ample space to buffer the volume change in the cycle test, improving the cycling stability. The NCO obtained at 350℃ has better performance. It exhibits a specific capacitance of 648.69 F/g at 1 A/g and good rate capability. Especially, at 10 A/g, the specific capacitance can still be maintained at 80.00% after 10000 galvanostatic charge/discharge(GCD) cycles, showing excellent cycling stability.

Key words: NiCo₂O₄, Porous nanowire array, High cycling stability, Supercapacitor

CHEN Chaoxian, ZHAO Chenyang, LI Cuihua, LIU Jianhong, GUI Dayong. Porous NiCo₂O₄ Nanowire Arrays as Supercapacitor Electrode Materials with Extremely High Cycling Stability[J]. Chemical Research in Chinese Universities, 2020, 36(4): 715-720.

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Porous NiCo₂O₄ Nanowire Arrays as Supercapacitor Electrode Materials with Extremely High Cycling Stability

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