Electrodeposition preparation of NiCo2O4 mesoporous film on ultrafine nickel wire for flexible asymmetric supercapacitors

Publication date: 1 August 2018
Source:Chemical Engineering Journal, Volume 345
Author(s): Ni Wang, Baolong Sun, Peng Zhao, Mengqi Yao, Wencheng Hu, Sridhar Komarneni
Mesoporous NiCo2O4 was directly coated on an ultrafine nickel wire to fabricate a battery-type electrode through a facile process comprising electrodeposition of Ni/Co/Zn alloy, dealloying, and oxidation. The binder-free electrode with flexible features delivers a high specific capacity of 315.4 C g⁻¹ and excellent cycling performance (retention after 50,000 cycles). An assembled asymmetric supercapacitor containing NiCo2O4/ultrafine nickel wire with Fe3O4/ultrafine nickel wire shows high energy density of 32.6 Wh kg⁻¹, high power density of 35,000 W kg⁻¹, and 94.8% retention of initial capacity after 20,000 cycles. This work proposes a simple design and facile process for fabrication of practical flexible energy storage devices.

Graphical abstract

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