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Here, a successful in situ synthesis of FeCoNiMnCr high\u2010entropy alloy (HEA) and high\u2010entropy oxide (HEO) heterocatalysts via a Cr\u2010induced spontaneous reconstruction strategy is reported, and it is demonstrated that they deliver excellent ultrastable OER electrocatalytic performance with a low overpotential of 320\u00a0mV at 500\u00a0mA cm<jats:sup>\u22122<\/jats:sup> and a negligible activity loss after maintaining at 100\u00a0mA cm<jats:sup>\u22122<\/jats:sup> for 240\u00a0h. Remarkably, the heterocatalyst holds outstanding long\u2010term stability under harsh industrial condition of 6\u00a0<jats:sc>m<\/jats:sc> KOH and 85\u00a0\u00b0C at a current density of as high as 500\u00a0mA cm<jats:sup>\u22122<\/jats:sup> over 500\u00a0h. Density functional theory calculations reveal that the formation of the HEA\u2010HEO heterostructure can provide electroactive sites possessing robust valence states to guarantee long\u2010term stable OER process, leading to the enhancement of electroactivity. The findings of such highly stable OER heterocatalysts under industrial conditions offer a new perspective for designing and constructing efficient high\u2010entropy electrocatalysts for practical industrial water splitting.<\/jats:p>","DOI":"10.1002\/adma.202310918","type":"journal-article","created":{"date-parts":[[2024,1,3]],"date-time":"2024-01-03T10:18:53Z","timestamp":1704277133000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":159,"title":["In Situ Reconstruction of High\u2010Entropy Heterostructure Catalysts for Stable Oxygen Evolution Electrocatalysis under Industrial Conditions"],"prefix":"10.1002","volume":"36","author":[{"given":"Jue","family":"Hu","sequence":"first","affiliation":[{"name":"Faculty of Metallurgical and Energy Engineering Kunming University of Science and Technology  Kunming 650093 China"},{"name":"Key Laboratory of Unconventional Metallurgy Kunming University of Science and Technology  Kunming 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Metallurgy Kunming University of Science and Technology  Kunming 650093 China"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-4100-4852","authenticated-orcid":false,"given":"Chengxu","family":"Zhang","sequence":"additional","affiliation":[{"name":"Faculty of Metallurgical and Energy Engineering Kunming University of Science and Technology  Kunming 650093 China"}]},{"given":"Yuebin","family":"Feng","sequence":"additional","affiliation":[{"name":"Faculty of Science Kunming University of Science and Technology  Kunming 650093 China"}]},{"given":"Mingzi","family":"Sun","sequence":"additional","affiliation":[{"name":"Department of Applied Biology and Chemical Technology The Hong Kong Polytechnic University  Hung Hom, Kowloon Hong Kong SAR China"}]},{"given":"Lijian","family":"Meng","sequence":"additional","affiliation":[{"name":"CIETI, ISEP, Polytechnic of Porto, Rua Sr. Ant\u00f3nio Bernardino de Almeida  Porto 4249\u2010015 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