Issue 46, 2023

Intrinsically robust cubic MnCoOx solid solution: achieving high activity for sustainable acidic water oxidation

Abstract

This article reveals the promising potential of MnCoOx solid solutions as an effective catalyst for the oxygen evolution reaction (OER). The solid oxide solution was synthesized by utilizing redox deposition of KMnO4 and Co(NO3)2 on a carbon paper (CP) support with varying Co/Mn ratios. XRD and TEM analyses confirmed the homogeneous distribution of Co and Mn species in MnCoOx. According to OER tests in acid electrolyte, the catalytic efficiency of Mn1Co5Ox surpassed that of Co3O4, MnOx, and IrO2, demonstrating overpotentials of 275 and 569 mV at a current density of 10 and 100 mA cm−2, respectively. The investigation emphasizes the crucial roles of Co3+ and Mn4+ cations as well as oxygen vacancies (Ov) sites in facilitating the OER mechanism. These essential characteristics were duly observed in a Mn1Co5Ox solid solution catalyst. Furthermore, the introduction of a Mn dopant contributed to the durability of Mn1Co5Ox in acidic OER, thereby exhibiting outstanding catalytic stability for nearly 300 hours at 100 mA cm−2 current density. In addition, DFT studies provided insight into how Mn1Co5Ox enhances the catalytic performance of the OER. In conclusion, this study offers valuable insight into designing efficient OER catalysts using MnCoOx solid solutions as a promising candidate.

Graphical abstract: Intrinsically robust cubic MnCoOx solid solution: achieving high activity for sustainable acidic water oxidation

Supplementary files

Article information

Article type
Paper
Submitted
31 Aug. 2023
Accepted
08 Okt. 2023
First published
09 Okt. 2023

J. Mater. Chem. A, 2023,11, 25345-25355

Intrinsically robust cubic MnCoOx solid solution: achieving high activity for sustainable acidic water oxidation

J. Zhang, A. Raza, Y. Zhao, S. Guo, Z. U. D. Babar, L. Xu, C. Cao and G. Li, J. Mater. Chem. A, 2023, 11, 25345 DOI: 10.1039/D3TA05233H

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