Issue 22, 2021

Particle size-controlled synthesis of high-performance MnCo-based materials for alkaline OER at fluctuating potentials

Abstract

For the large-scale generation of hydrogen via water electrolysis the design of long term stable and active catalysts for the oxygen evolution reaction (OER) remains a key challenge. Most catalysts suffer from severe structural corrosion that becomes even more pronounced at fluctuating potentials. Herein, MnCo based cubic particles were prepared via a hydrothermal approach, in which the edge length of the micron-sized particles can be controlled by changing the pH value of the precursor solution. The cubes are composed of varying amounts of MnCo2O4, CoCO3 and a mixed (Mn/Co)CO3 phase. Structure–activity relationships were deduced revealing a volcano-type behavior for the intrinsic OER activity and fraction of spinel oxide phase. A low overpotential of 0.37 V at 10 mA cm−2 and a stability of more than 25 h was achieved in 1.0 M KOH using a rotating disc electrode (RDE) setup. The best performing catalyst material was successfully tested under dynamic process conditions for 9.5 h and shows a superior catalytic activity as anode for the overall water splitting in an electrolyser setup in 1.0 M KOH at 333 K compared to a reference NiCo-spinel catalyst.

Graphical abstract: Particle size-controlled synthesis of high-performance MnCo-based materials for alkaline OER at fluctuating potentials

Supplementary files

Article information

Article type
Paper
Submitted
21 May 2021
Accepted
03 Oct 2021
First published
04 Oct 2021
This article is Open Access
Creative Commons BY license

Catal. Sci. Technol., 2021,11, 7278-7286

Particle size-controlled synthesis of high-performance MnCo-based materials for alkaline OER at fluctuating potentials

C. Broicher, M. Klingenhof, M. Frisch, S. Dresp, N. M. Kubo, J. Artz, J. Radnik, S. Palkovits, A. K. Beine, P. Strasser and R. Palkovits, Catal. Sci. Technol., 2021, 11, 7278 DOI: 10.1039/D1CY00905B

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