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The Role of Surface Hydroxylation, Lattice Vacancies and Bond Covalency in the Electrochemical Oxidation of Water (OER) on Ni-Depleted Iridium Oxide Catalysts

MPS-Authors
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Frevel,  Lorenz
Inorganic Chemistry, Fritz Haber Institute, Max Planck Society;

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Jones,  Travis
Inorganic Chemistry, Fritz Haber Institute, Max Planck Society;

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Schlögl,  Robert
Department of Heterogeneous Reactions, Max-Planck-Institute for Chemical Energy Conversion;
Inorganic Chemistry, Fritz Haber Institute, Max Planck Society;

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Teschner,  Detre
Department of Heterogeneous Reactions, Max-Planck-Institute for Chemical Energy Conversion;
Inorganic Chemistry, Fritz Haber Institute, Max Planck Society;

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Citation

Nong, H. N., Tran, H. P., Spöri, C., Klingenhof, M., Frevel, L., Jones, T., et al. (2020). The Role of Surface Hydroxylation, Lattice Vacancies and Bond Covalency in the Electrochemical Oxidation of Water (OER) on Ni-Depleted Iridium Oxide Catalysts. Zeitschrift für Physikalische Chemie, 234(5), 787-812. doi:10.1515/zpch-2019-1460.


Cite as: http://hdl.handle.net/21.11116/0000-0005-59D5-7
Abstract
The usage of iridium as an oxygen-evolution-reaction (OER) electrocatalyst requires very high atom efficiencies paired with high activity and stability. Our efforts during the past 6 years in the Priority Program 1613 funded by the Deutsche Forschungsgemeinschaft (DFG) were focused to mitigate the molecular origin of kinetic overpotentials of Ir-based OER catalysts and to design new materials to achieve that Ir-based catalysts are more atom and energy efficient, as well as stable. Approaches involved are: (1) use of bimetallic mixed metal oxide materials where Ir is combined with cheaper transition metals as starting materials, (2) use of dealloying concepts of nanometer sized core-shell particle with a thin noble metal oxide shell combined with a hollow or cheap transition metal-rich alloy core, and (3) use of corrosion-resistant high-surface-area oxide support materials. In this mini review, we have highlighted selected advances in our understanding of Ir–Ni bimetallic oxide electrocatalysts for the OER in acidic environments.