High‐Performance Supported Iridium Oxohydroxide Water Oxidation Electrocatalysts

Wiley - Tập 10 Số 9 - Trang 1943-1957 - 2017
Cyriac Massué1,2, Verena Streibel2, Xing Huang2, J. Noack2, Andrey Tarasov2, Sébastien Cap2, Robert Schlögl1,2
1Department of Heterogenous Reactions Max Planck Institute for Chemical Energy Conversion Stiftstrasse 34–36 45470 Mülheim-an-der-Ruhr Germany
2Department of Inorganic Chemistry Fritz Haber Institute of the Max Planck Society Faradayweg 4–6 14195 Berlin Germany

Tóm tắt

AbstractThe 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 IrIII/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 20 μgIr 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 IrIII/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.

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Wiley

Tập 10 Số 9

1943-1957

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