Issue 20, 2024

Boosting alkaline water splitting efficiency: NiOOH–MnOOH heterojunctions via in situ anodic oxidation

Abstract

Designing noble metal-free electrocatalysts remains a challenge for the oxygen evolution reaction (OER) in alkaline solutions. In this study, we present a facile electrodeposition approach coupled with an in situ anodic oxidation method to synthesize NiOOH–MnS/NF on nickel foam (NF), successfully creating NiOOH–MnOOH/NF heterojunctions to boost OER performance under alkaline conditions. The heterojunction's synergistic effect significantly modulates the adsorption energy of the rate-determining step (RDS), thereby enhancing the intrinsic electrocatalytic activity of the NiOOH–MnOOH/NF electrocatalyst. Furthermore, the introduction of SO42− leads to a variable degree of electron loss in both Mn and Ni, reducing adsorption strength of the OER intermediates and thus optimizing reaction kinetics. The as-prepared NiOOH–MnOOH/NF electrocatalyst demonstrates exceptional OER performance in 1.0 M KOH, achieving a current density of 100 mA cm−2 with a Tafel slope of 52.3 mV dec−1 and a minimal overpotential of 391 mV. Utilizing NiOOH–MnOOH/NF as a bifunctional electrode for overall water splitting (OWS), the system operates at a low potential of 1.66 V at 10 mA cm−2, showcasing its excellent durability. This work offers novel insights and promising prospects for the advancement and practical application of non-precious metal electrocatalysts in the field of electrocatalytic water splitting.

Graphical abstract: Boosting alkaline water splitting efficiency: NiOOH–MnOOH heterojunctions via in situ anodic oxidation

Supplementary files

Article information

Article type
Research Article
Submitted
15 Kho 2024
Accepted
04 Mha 2024
First published
06 Mha 2024

Mater. Chem. Front., 2024,8, 3290-3299

Boosting alkaline water splitting efficiency: NiOOH–MnOOH heterojunctions via in situ anodic oxidation

Y. Zhou, J. Hu, Y. Liu, W. Fan, P. Tao, R. Yang, H. Huang, X. Cao, H. Li and S. Li, Mater. Chem. Front., 2024, 8, 3290 DOI: 10.1039/D4QM00512K

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