Nanocrystalline Iridium Oxide Stabilized by Magnesium–Titanium–Spinel as Active Acidic Oxygen Evolution Reaction Catalyst

Prölß T, Parzinger P, Alkemper A, Hutzler A, Askari AB, Maeda N, Hofmann JP, Franken T (2026)

Publication Type: Journal article

Publication year: 2026

Journal

Advanced Energy and Sustainability Research Wiley

Book Volume: 7

Article Number: e70276

Journal Issue: 9

DOI: 10.1002/aesr.70276

Abstract

Hydrogen produced by proton exchange water electrolysis (PEM-WE) is crucial in storing and transporting green energy from renewable resources. However, broad application of PEM-WE technology is hindered by the necessity of scarce and expensive iridium oxide needed to catalyze the sluggish oxygen evolution reaction on the anode. A reduction of iridium loading can be achieved by using mixed metal oxides. Herein, we show an iridium–magnesium–titanium spinel with a threefold increase in mass specific iridium activity compared to commercial iridium oxide. We report the strong influence of iridium content on the intrinsic activity and the necessity of soft calcination conditions to obtain a highly active catalyst. The observed high activity is contributed to finely dispersed nanosized iridium clusters in the transitional state from amorphous to crystalline iridium oxide interacting with the underlying mixed metal oxide.

Involved external institutions

Technische Universität Darmstadt DE Germany (DE) Forschungszentrum Jülich / Research Centre Jülich (FZJ) DE Germany (DE) Kyushu University / 九州大学 JP Japan (JP)

How to cite

APA:

Prölß, T., Parzinger, P., Alkemper, A., Hutzler, A., Askari, A.B., Maeda, N.,... Franken, T. (2026). Nanocrystalline Iridium Oxide Stabilized by Magnesium–Titanium–Spinel as Active Acidic Oxygen Evolution Reaction Catalyst. Advanced Energy and Sustainability Research, 7(9). https://doi.org/10.1002/aesr.70276

MLA:

Prölß, Timo, et al. "Nanocrystalline Iridium Oxide Stabilized by Magnesium–Titanium–Spinel as Active Acidic Oxygen Evolution Reaction Catalyst." Advanced Energy and Sustainability Research 7.9 (2026).

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