Issue 8, 2019

In situ construction of dual-morphology ZnCo2O4 for high-performance asymmetric supercapacitors

Abstract

In this study, the controllable preparation of ZnCo2O4 with different morphologies in a reaction system and the orderly weaving of these morphologies into special structures was demonstrated, which might be impossible to achieve using other methods; herein, we successfully prepared a dual-morphology ZnCo2O4/N-doped reduced graphene oxide/Ni foam substrate (ZNGN) electrode by ultrasonic processing, a one-step hydrothermal method and a subsequent annealing process for high-performance supercapacitors. At first, ZnCo2O4 nanosheet orderly formed a honeycomb structure on the surface of Ni foam (NF); this improved the redox surface area of the electrode; then, feather-like ZnCo2O4 was evenly distributed over the honeycomb structure, playing the role of containment and fixation to provide space for material volume expansion during charging and discharging. The electrochemical test showed that the maximum capacitance of the ZNGN electrode was 1600 F g−1 (960C g−1) at the current density of 1 A g−1 in a 6 M KOH solution. Moreover, the asymmetric supercapacitor ZNGN//activated carbon (ZNGN//AC) displayed the excellent energy density of 66.1 W h kg−1 at the power density of 701 W kg−1. Compared with the capacitance (233.3 F g−1 and 326.6C g−1) when ZNGN//AC was fully activated at 4 A g−1, there was almost no loss in capacitance after 2000 charge–discharge cycles, and a 94% capacitance retention was achieved after 5000 cycles. Thus, this excellent electrochemical property highlights the potential application of the dual-morphology ZnCo2O4 electrode in supercapacitors.

Graphical abstract: In situ construction of dual-morphology ZnCo2O4 for high-performance asymmetric supercapacitors

Supplementary files

Article information

Article type
Paper
Submitted
10 apr 2019
Accepted
17 iyn 2019
First published
22 iyn 2019
This article is Open Access
Creative Commons BY-NC license

Nanoscale Adv., 2019,1, 3086-3094

In situ construction of dual-morphology ZnCo2O4 for high-performance asymmetric supercapacitors

Z. Wang, S. Lu, G. He, A. Lv, Y. Shen and W. Xu, Nanoscale Adv., 2019, 1, 3086 DOI: 10.1039/C9NA00230H

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