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Herein, we demonstrate crystal\u2010phase engineering of WO\n                    <jats:sub>3<\/jats:sub>\n                    supports\u2014monoclinic (M\u2010WO\n                    <jats:sub>3<\/jats:sub>\n                    ), orthorhombic (O\u2010WO\n                    <jats:sub>3<\/jats:sub>\n                    ), and tetragonal (T\u2010WO\n                    <jats:sub>3<\/jats:sub>\n                    )\u2014to modulate MSI in Ir single\u2010atom catalysts. The three WO\n                    <jats:sub>3<\/jats:sub>\n                    crystals exhibit distinct distortion degrees (M\u2010WO\n                    <jats:sub>3<\/jats:sub>\n                    &gt; O\u2010WO\n                    <jats:sub>3<\/jats:sub>\n                    &gt; T\u2010WO\n                    <jats:sub>3<\/jats:sub>\n                    ), where stronger distortion enhances Ir activity but compromises stability. Notably, O\u2010WO\n                    <jats:sub>3<\/jats:sub>\n                    achieves an optimal modulation balance: the moderate W\u2500O bond strength and distortion induce the strongest MSI, elevating the Ir oxidation state to +5.74, shortening the Ir\u2500O bond, and reinforcing Ir\u2500O covalency. Such favorable electronic and structural modulation substantially promotes intrinsic oxygen evolution reaction (OER) activity. The O\u2500WO\n                    <jats:sub>3<\/jats:sub>\n                    \u2500Ir catalyst exhibits a low overpotential of 219\u00a0mV at 10\u00a0mA\u00a0cm\n                    <jats:sup>\u22122<\/jats:sup>\n                    and demonstrates outstanding acidic OER stability, with a cumulative operation time over 1000\u00a0h under sequential testing at different current densities. The optimized MSI promotes high\u2010valence Ir formation, accelerates *OO intermediate generation, and suppresses Ir dissolution, thereby addressing sluggish kinetics and unstable active sites. This work provides new insights into regulating MSI strength via crystal\u2010phase engineering to advance durable and efficient acidic OER catalysts.\n                  <\/jats:p>","DOI":"10.1002\/anie.7046071","type":"journal-article","created":{"date-parts":[[2026,9,23]],"date-time":"2026-09-23T04:12:57Z","timestamp":1790136777000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Regulating Metal\u2013Support Interaction via WO\n                    <sub>3<\/sub>\n                    Crystal Phase Engineering for Enhanced Acidic Water Oxidation"],"prefix":"10.1002","author":[{"given":"Chaolong","family":"Wang","sequence":"first","affiliation":[{"name":"Interdisciplinary Research Center for Sustainable Energy Science and Engineering (IRC4SE<sup>2<\/sup>) National Key Laboratory of Special Rare Metal Materials School of Chemical Engineering Zhengzhou University  Zhengzhou P. R. China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Chaofan","family":"Yang","sequence":"additional","affiliation":[{"name":"Interdisciplinary Research Center for Sustainable Energy Science and Engineering (IRC4SE<sup>2<\/sup>) National Key Laboratory of Special Rare Metal Materials School of Chemical Engineering Zhengzhou University  Zhengzhou P. R. China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Yuna","family":"Han","sequence":"additional","affiliation":[{"name":"Interdisciplinary Research Center for Sustainable Energy Science and Engineering (IRC4SE<sup>2<\/sup>) National Key Laboratory of Special Rare Metal Materials School of Chemical Engineering Zhengzhou University  Zhengzhou P. R. China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jiacong","family":"Lei","sequence":"additional","affiliation":[{"name":"Interdisciplinary Research Center for Sustainable Energy Science and Engineering (IRC4SE<sup>2<\/sup>) National Key Laboratory of Special Rare Metal Materials School of Chemical Engineering Zhengzhou University  Zhengzhou P. R. China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-6261-0803","authenticated-orcid":false,"given":"Shasha","family":"Gao","sequence":"additional","affiliation":[{"name":"Key Laboratory of Microelectronics and Energy of Henan Province College of Physics and Electronic Engineering Xinyang Normal University  Xinyang P. R. China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Dong","family":"Guo","sequence":"additional","affiliation":[{"name":"Interdisciplinary Research Center for Sustainable Energy Science and Engineering (IRC4SE<sup>2<\/sup>) National Key Laboratory of Special Rare Metal Materials School of Chemical Engineering Zhengzhou University  Zhengzhou P. R. China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-0082-2306","authenticated-orcid":false,"given":"Gonglei","family":"Shao","sequence":"additional","affiliation":[{"name":"Interdisciplinary Research Center for Sustainable Energy Science and Engineering (IRC4SE<sup>2<\/sup>) National Key Laboratory of Special Rare Metal Materials School of Chemical Engineering Zhengzhou University  Zhengzhou P. R. China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-3232-9903","authenticated-orcid":false,"given":"Zhen","family":"Zhou","sequence":"additional","affiliation":[{"name":"College of New Energy and Intelligent Manufacturing Henan University  Zhengzhou P. R. China"},{"name":"Collaborative Innovation Center of Materials Science Nankai University  Tianjin P. R. China"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"311","published-online":{"date-parts":[[2026,9,22]]},"reference":[{"key":"e_1_2_8_2_1","doi-asserted-by":"publisher","DOI":"10.1021\/acs.chemrev.9b00659"},{"key":"e_1_2_8_3_1","doi-asserted-by":"publisher","DOI":"10.1126\/science.aar6611"},{"key":"e_1_2_8_4_1","doi-asserted-by":"publisher","DOI":"10.1021\/acs.chemrev.6b00075"},{"key":"e_1_2_8_5_1","doi-asserted-by":"publisher","DOI":"10.1039\/c4cs00484a"},{"key":"e_1_2_8_6_1","doi-asserted-by":"publisher","DOI":"10.1038\/nature11115"},{"key":"e_1_2_8_7_1","doi-asserted-by":"publisher","DOI":"10.1002\/adma.202306108"},{"key":"e_1_2_8_8_1","doi-asserted-by":"publisher","DOI":"10.1002\/adma.202409386"},{"key":"e_1_2_8_9_1","doi-asserted-by":"publisher","DOI":"10.1038\/s41467\u2010023\u201044483\u20106"},{"key":"e_1_2_8_10_1","doi-asserted-by":"publisher","DOI":"10.1021\/jacs.4c11477"},{"key":"e_1_2_8_11_1","doi-asserted-by":"publisher","DOI":"10.1021\/acscentsci.5c01144"},{"key":"e_1_2_8_12_1","doi-asserted-by":"publisher","DOI":"10.1002\/adma.202519807"},{"key":"e_1_2_8_13_1","doi-asserted-by":"publisher","DOI":"10.1038\/s41467\u2010025\u201063577\u2010x"},{"key":"e_1_2_8_14_1","doi-asserted-by":"publisher","DOI":"10.34133\/research.0677"},{"key":"e_1_2_8_15_1","doi-asserted-by":"publisher","DOI":"10.1021\/acs.chemrev.7b00776"},{"key":"e_1_2_8_16_1","doi-asserted-by":"publisher","DOI":"10.1038\/s41467\u2010024\u201053763\u20108"},{"key":"e_1_2_8_17_1","doi-asserted-by":"publisher","DOI":"10.1002\/adma.202412950"},{"key":"e_1_2_8_18_1","doi-asserted-by":"publisher","DOI":"10.1038\/s41565\u2010024\u201001807\u2010x"},{"key":"e_1_2_8_19_1","doi-asserted-by":"publisher","DOI":"10.1021\/acscatal.5c02132"},{"key":"e_1_2_8_20_1","doi-asserted-by":"publisher","DOI":"10.1021\/acs.accounts.5c00305"},{"key":"e_1_2_8_21_1","doi-asserted-by":"publisher","DOI":"10.1038\/s41467\u2010025\u201059722\u20101"},{"key":"e_1_2_8_22_1","doi-asserted-by":"publisher","DOI":"10.1038\/s41467\u2010025\u201063397\u2010z"},{"key":"e_1_2_8_23_1","doi-asserted-by":"publisher","DOI":"10.1021\/jacs.5c13365"},{"key":"e_1_2_8_24_1","doi-asserted-by":"publisher","DOI":"10.1002\/adma.202501381"},{"key":"e_1_2_8_25_1","doi-asserted-by":"publisher","DOI":"10.1126\/sciadv.abo0762"},{"key":"e_1_2_8_26_1","doi-asserted-by":"publisher","DOI":"10.1021\/acs.chemrev.0c00797"},{"key":"e_1_2_8_27_1","doi-asserted-by":"publisher","DOI":"10.1039\/D4EE00173G"},{"key":"e_1_2_8_28_1","doi-asserted-by":"publisher","DOI":"10.1021\/jacs.5c02857"},{"key":"e_1_2_8_29_1","doi-asserted-by":"publisher","DOI":"10.1002\/adfm.202422166"},{"key":"e_1_2_8_30_1","doi-asserted-by":"publisher","DOI":"10.1021\/jacs.5c05795"},{"key":"e_1_2_8_31_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.jechem.2025.01.054"},{"key":"e_1_2_8_32_1","doi-asserted-by":"publisher","DOI":"10.1038\/s41467\u2010023\u201039963\u20108"},{"key":"e_1_2_8_33_1","doi-asserted-by":"publisher","DOI":"10.1021\/acscatal.6c03449"},{"key":"e_1_2_8_34_1","doi-asserted-by":"publisher","DOI":"10.1021\/acs.chemrev.5c00222"},{"key":"e_1_2_8_35_1","doi-asserted-by":"publisher","DOI":"10.1126\/science.adk9849"},{"key":"e_1_2_8_36_1","doi-asserted-by":"publisher","DOI":"10.1002\/adfm.202520812"},{"key":"e_1_2_8_37_1","doi-asserted-by":"publisher","DOI":"10.1002\/adfm.202501142"},{"key":"e_1_2_8_38_1","doi-asserted-by":"publisher","DOI":"10.1038\/s41467\u2010022\u201035426\u20108"},{"key":"e_1_2_8_39_1","doi-asserted-by":"publisher","DOI":"10.1038\/s41467\u2010025\u201059710\u20105"},{"key":"e_1_2_8_40_1","doi-asserted-by":"publisher","DOI":"10.1038\/nchem.2695"},{"key":"e_1_2_8_41_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.joule.2021.05.018"},{"key":"e_1_2_8_42_1","doi-asserted-by":"publisher","DOI":"10.1002\/adma.202312608"},{"key":"e_1_2_8_43_1","doi-asserted-by":"publisher","DOI":"10.1038\/s41563\u2010022\u201001380\u20105"},{"key":"e_1_2_8_44_1","doi-asserted-by":"publisher","DOI":"10.1038\/s41467\u2010025\u201060083\u2010y"},{"key":"e_1_2_8_45_1","doi-asserted-by":"publisher","DOI":"10.1021\/jacs.4c13656"},{"key":"e_1_2_8_46_1","doi-asserted-by":"publisher","DOI":"10.1038\/s41467\u2010023\u201038310\u20101"},{"key":"e_1_2_8_47_1","doi-asserted-by":"publisher","DOI":"10.1126\/sciadv.abq3563"},{"key":"e_1_2_8_48_1","doi-asserted-by":"publisher","DOI":"10.1038\/s41467\u2010024\u201055120\u20101"},{"key":"e_1_2_8_49_1","doi-asserted-by":"publisher","DOI":"10.1038\/s41557\u2010025\u201001898\u20106"}],"container-title":["Angewandte 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