Issue 19, 2021

Oxygen vacancy enriched NiMoO4 nanorods via microwave heating: a promising highly stable electrocatalyst for total water splitting

Abstract

It is indeed necessary to develop a suitable bi-functional catalyst for total water splitting. Here, in this work, we demonstrate a microwave-assisted formulation of NiMoO4 nanorods within 30 minutes of the reaction time. As synthesized NiMoO4 nanorods grown on nickel foam were treated with NaBH4 to create internal oxygen vacancies [NiMoO4(Vo)] that favoured OER and HER with very merginal applied overpotential. The generation of oxygen vacancies in the lattice generally leads to the formation of an effective electronic structure for proceeding OER activity in a sustainable way. When vacancy-enriched NiMoO4(Vo) nanorods were applied for OER and HER under alkaline conditions, it demands only 220 and 255 mV overpotential at 50 mA cm−2 current density, respectively. Having observed their phenomenal response in both OER and HER, they were analysed for the real device as the two-electrode system (NiMoO4(Vo) nanorods as anode and cathode); they needed 490 mV as overpotential at 50 mA cm−2. Based on the molecular orbital and band-structured theories, it has been understood that the band gap state (BGS) led to the formation of antibonding states with a very low electron population that favoured rich OER and HER kinetics, as observed from the electrochemical results.

Graphical abstract: Oxygen vacancy enriched NiMoO4 nanorods via microwave heating: a promising highly stable electrocatalyst for total water splitting

Supplementary files

Article information

Article type
Paper
Submitted
15 3 2021
Accepted
13 4 2021
First published
13 4 2021

J. Mater. Chem. A, 2021,9, 11691-11704

Oxygen vacancy enriched NiMoO4 nanorods via microwave heating: a promising highly stable electrocatalyst for total water splitting

A. Karmakar, K. Karthick, S. S. Sankar, S. Kumaravel, M. Ragunath and S. Kundu, J. Mater. Chem. A, 2021, 9, 11691 DOI: 10.1039/D1TA02165F

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