Issue 49, 2018, Issue in Progress

Three-dimensional flower-like NiCo2O4/CNT for efficient catalysis of the oxygen evolution reaction

Abstract

The oxygen evolution reaction (OER) is an important reaction especially in water splitting and metal–air batteries. Highly efficient non-noble metal based electrocatalysts are urgently required to be developed and to replace the commercial Ru/Ir based oxide. Herein, we report the three-dimensional hierarchical NiCo2O4/CNT-150 composite with high activity for the OER that was synthesized via a hydrothermal reaction and subsequent annealing. Compared with CNTs, commercial RuO2 catalysts, NiCo2O4/CNT, NiCo2O4/CNT-250, and NiCo2O4/CNT-150 exhibit enhanced electrocatalytic performance with a lower onset overpotential of 300 mV and the corresponding Tafel slope of 129 mV per decade. The flower-like NiCo2O4/CNT-150 shows an excellent catalysis performance with higher current density than the commercial RuO2 catalyst. Moreover, the NiCo2O4/CNT-150 demonstrates the excellent long-term durability in 0.1 mol L−1 KOH for the OER. The significant catalytic performances are ascribed to the excellent conductivity of CNTs and the high specific surface area of the three dimensional flower-like NiCo2O4.

Graphical abstract: Three-dimensional flower-like NiCo2O4/CNT for efficient catalysis of the oxygen evolution reaction

Supplementary files

Article information

Article type
Paper
Submitted
02 Jul 2018
Accepted
30 Jul 2018
First published
07 Aug 2018
This article is Open Access
Creative Commons BY-NC license

RSC Adv., 2018,8, 28209-28215

Three-dimensional flower-like NiCo2O4/CNT for efficient catalysis of the oxygen evolution reaction

Z. Ma, H. Fu, C. Gu, Y. Huang, S. Hu, Q. Li and H. Wang, RSC Adv., 2018, 8, 28209 DOI: 10.1039/C8RA05639K

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