Issue 8, 2022

Design of NiCo2O4@NiMoO4 core–shell nanoarrays on nickel foam to explore the application in both energy storage and electrocatalysis

Abstract

NiCo2O4@NiMoO4 core–shell nanowires (NCNMW) and nanosheets (NCNMS) with high electrochemical capabilities were synthesized using a simple two-step hydrothermal reaction, together with a calcination process. As active electrode materials, all of the prepared electrodes were tested in a three-electrode system. Among all the electrodes, NCNMS-2 exhibited a large specific capacity (1770.95 C g−1 at a current density of 3 mA cm−2), a high-rate capability (1334.18 C g−1 at 40 mA cm−2), and superior cycling stability (102.78% capability retention after 5000 cycles at 10 mA cm−2). The NCNMS-2//activated carbon battery–supercapacitor hybrid device yielded a high energy density of 30.57 W h kg−1 at a power density of 676.06 W kg−1 and excellent stability with a capacitance retention of 92.71% after 5000 continuous cycles at a current density of 10 mA cm−2. In addition, as an electrocatalyst for the oxygen evolution reaction (OER), the NCNMS-2 exhibited a small Tafel slope of 59 mV Dec−1, and a low overpotential of 175 mV at a current density of 10 mA cm−2. The excellent electrochemical performance of the hierarchical NiCo2O4@NiMoO4 structure was attributed to its porosity and the characteristics of the 3D nanostructure subunits that possess many active reaction sites, rapid electron/ion transport, and high stability. Based on the excellent electrochemical properties, it will serve well for energy storage and conversion.

Graphical abstract: Design of NiCo2O4@NiMoO4 core–shell nanoarrays on nickel foam to explore the application in both energy storage and electrocatalysis

Supplementary files

Article information

Article type
Research Article
Submitted
19 Nov 2021
Accepted
26 Feb 2022
First published
03 Mar 2022

Mater. Chem. Front., 2022,6, 1056-1067

Design of NiCo2O4@NiMoO4 core–shell nanoarrays on nickel foam to explore the application in both energy storage and electrocatalysis

Y. Meng, J. Liu, D. Yu, C. Guo, L. Liu, Y. Hua, C. Wang, X. Zhao and X. Liu, Mater. Chem. Front., 2022, 6, 1056 DOI: 10.1039/D1QM01534F

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