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Here, we construct a self\u2010supported bimetallic metal\u2013organic framework precatalyst (PAx\u2010NiCo\u2010BDC) through a two\u2010step strategy using phytic acid (PA) for mild etching and multidentate coordination. This treatment introduces oxygen\u2010vacancy\u2010related coordination defects and regulates the precursor morphology. The optimized PA3\u2010NiCo\u2010BDC requires only 212\u00a0mV to reach 10\u00a0mA cm\n                    <jats:sup>\u2212<\/jats:sup>\n                    <jats:sup>2<\/jats:sup>\n                    , exhibits a Tafel slope of 20.2\u00a0mV dec\n                    <jats:sup>\u2212<\/jats:sup>\n                    <jats:sup>1<\/jats:sup>\n                    , and shows excellent durability, outperforming commercial RuO\n                    <jats:sub>2<\/jats:sub>\n                    . An anion\u2010exchange\u2010membrane water electrolyzer employing PA3\u2010NiCo\u2010BDC delivers 1 A cm\n                    <jats:sup>\u2212<\/jats:sup>\n                    <jats:sup>2<\/jats:sup>\n                    at 1.72\u00a0V and operates stably for 300\u00a0h. In situ Raman spectroscopy reveals that PA\u2010induced defects enable the lower\u2010potential formation of Ni\n                    <jats:sup>3+<\/jats:sup>\n                    \u2013O\u2010containing NiOOH\u2010like surface species. Differential electrochemical mass spectrometry identifies the adsorbate evolution mechanism as the dominant OER pathway. Density functional theory calculations further show that defect\u2010induced d\u2010band\u2010center modulation optimizes the adsorption and desorption of OER intermediates at Ni sites and lowers the OER energy barrier. This green coordination\u2010engineering strategy provides a versatile route to efficient and durable MOF\u2010based electrodes for practical water electrolysis.\n                  <\/jats:p>","DOI":"10.1002\/smll.76082","type":"journal-article","created":{"date-parts":[[2026,10,4]],"date-time":"2026-10-04T14:05:47Z","timestamp":1791122747000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Phytic Acid\u2010Induced Oxygen Vacancies in Self\u2010Supporting NiCo Metal\u2010Organic Frameworks for Efficient Oxygen Evolution Reaction"],"prefix":"10.1002","author":[{"given":"Hanya","family":"Ye","sequence":"first","affiliation":[{"name":"Institute of Energy Materials Science University of Shanghai for Science and Technology  Shanghai 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