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Microwave-Assisted Synthesis of Stable and Highly Active Ir Oxohydroxides for Electrochemical Oxidation of Water

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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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Ranjan,  Chinmoy
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., Huang, X., Tarasov, A., Ranjan, C., Cap, S., & Schlögl, R. (2017). Microwave-Assisted Synthesis of Stable and Highly Active Ir Oxohydroxides for Electrochemical Oxidation of Water. ChemSusChem, 10(9), 1958-1968. doi:10.1002/cssc.201601864.


Cite as: http://hdl.handle.net/21.11116/0000-0007-18B6-1
Abstract
Water splitting for hydrogen production in acidic media has been limited by the poor stability of the anodic electrocatalyst devoted to the oxygen evolution reaction (OER). To help circumvent this problem we have synthesized a class of novel Ir oxohydroxides by rapid microwave-asisted hydrothermal synthesis, which bridges the gap between electrodeposited amorphous IrOx films and crystalline IrO2 electrocatalysts prepared by calcination routes. For electrode loadings two orders of magnitude below current standards, the synthesized compounds present an unrivalled combination of high activity and stability under commercially relevant OER conditions in comparison to reported benchmarks, without need for pretreatment. The best compound achieved a lifetime 33times longer than the best commercial Ir benchmark. Thus, the reported efficient synthesis of an Ir oxohydroxide phase with superior intrinsic OER performance constitutes a major step towards the targeted design of cost-efficient Ir based OER electrocatalysts for acidic media.