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To address this challenge, we obtained an outstanding high\u2010performance OER catalyst by loading Ir on conductive antimony\u2010doped tin oxide (ATO)\u2010nanoparticles by a microwave (MW)\u2010assisted hydrothermal route. The obtained Ir phase was identified by using XRD as amorphous (XRD\u2010amorphous), highly hydrated Ir<jats:sup>III\/IV<\/jats:sup> 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\u2005\u03bcg<jats:sub>Ir<\/jats:sub>\u2009cm<jats:sup>\u22122<\/jats:sup>, we used stepwise thermal treatment to gradually alter the XRD\u2010amorphous Ir phase by dehydroxylation and crystallization of IrO<jats:sub>2<\/jats:sub>. This resulted in dramatic depletion of OER performance, indicating that the outstanding electrocatalytic properties of the MW\u2010produced Ir<jats:sup>III\/IV<\/jats:sup> 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 IrO<jats:sub>2<\/jats:sub>\u2010based compounds produced through more classical calcination routes. Our investigation demonstrates the immense potential of Ir oxohydroxide\u2010based OER electrocatalysts for stable high\u2010current water electrolysis under acidic conditions.<\/jats:p>","DOI":"10.1002\/cssc.201601817","type":"journal-article","created":{"date-parts":[[2017,2,5]],"date-time":"2017-02-05T22:23:05Z","timestamp":1486333385000},"page":"1943-1957","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":85,"title":["High\u2010Performance Supported Iridium Oxohydroxide Water Oxidation Electrocatalysts"],"prefix":"10.1002","volume":"10","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-1575-5057","authenticated-orcid":false,"given":"Cyriac","family":"Massu\u00e9","sequence":"first","affiliation":[{"name":"Department of Inorganic Chemistry Fritz Haber Institute of the Max Planck Society  Faradayweg\u20054\u20136 14195 Berlin Germany"},{"name":"Department of Heterogenous Reactions Max Planck Institute for Chemical Energy 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