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High-Performance Supported Iridium Oxohydroxide Water Oxidation Electrocatalysts

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Massue,  Cyriac
Research Department Schlögl, Max Planck Institute for Chemical Energy Conversion, Max Planck Society;

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Huang,  Xing
Research Department Schlögl, Max Planck Institute for Chemical Energy Conversion, Max Planck Society;

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Schlögl,  Robert
Research Department Schlögl, Max Planck Institute for Chemical Energy Conversion, Max Planck Society;

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Citation

Massue, C., Pfeifer, V., Huang, X., Noack, J., Tarasov, A., Cap, S., et al. (2017). High-Performance Supported Iridium Oxohydroxide Water Oxidation Electrocatalysts. ChemSusChem, 10(9), 1943-1957. doi:10.1002/cssc.201601817.


Cite as: https://hdl.handle.net/21.11116/0000-0007-18B8-F
Abstract
The synthesis of a highly active and yet stable electrocatalyst for the anodic oxygen evolution reaction (OER) remains a major challenge for acidic water splitting on an industrial scale. To address this challenge, we obtained an outstanding high-performance OER catalyst by loading Ir on conductive antimony-doped tin oxide (ATO)-nanoparticles by a microwave (MW)-assisted hydrothermal route. The obtained Ir phase was identified by using XRD as amorphous (XRD-amorphous), highly hydrated Ir-III/IV oxohydroxide. To identify chemical and structural features responsible for the high activity and exceptional stability under acidic OER conditions with loadings as low as 20g(Ir)cm(-2), we used stepwise thermal treatment to gradually alter the XRD-amorphous Ir phase by dehydroxylation and crystallization of IrO2. This resulted in dramatic depletion of OER performance, indicating that the outstanding electrocatalytic properties of the MW-produced Ir-III/IV oxohydroxide are prominently linked to the nature of the produced Ir phase. This finding is in contrast with the often reported stable but poor OER performance of crystalline IrO2-based compounds produced through more classical calcination routes. Our investigation demonstrates the immense potential of Ir oxohydroxide-based OER electrocatalysts for stable high-current water electrolysis under acidic conditions.