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However, the FOR involves continuous C\u2500H bond cleavage of adsorbed intermediates to generate abundant surface H*. This necessitates rapid transfer and consumption of H* to sustain fast oxidation kinetics. Herein, we developed a hydrogen\u2010spillover strategy to redistribute these surface H* to accelerate FOR kinetics by constructing RhCu single\u2010atom alloy supported on a Cu single\u2010atom\u2010rich carbon matrix (RhCu@Cu\n                    <jats:sub>SA<\/jats:sub>\n                    NC). In this design, Cu incorporation creates a favorable landscape for H* migration toward the Cu\n                    <jats:sub>SA<\/jats:sub>\n                    NC support, which acts as efficient H* acceptors and H\u2500H coupling centers. Verified through multiple analyses, this hydrogen\u2010spillover mechanism is demonstrated to enhance FOR activity by accelerating H* redistribution. Consequently, RhCu@Cu\n                    <jats:sub>SA<\/jats:sub>\n                    NC shows outstanding FOR performance, achieving a current density of 800\u00a0mA cm\n                    <jats:sup>\u2212<\/jats:sup>\n                    <jats:sup>2<\/jats:sup>\n                    at 0.39\u00a0V with nearly 100% H\n                    <jats:sub>2<\/jats:sub>\n                    selectivity and excellent durability. When integrated into a hybrid alkali\u2010acid cell, it provides an open circuit voltage of 1.72\u00a0V and peak power density of 152.6\u00a0mW cm\n                    <jats:sup>\u2212<\/jats:sup>\n                    <jats:sup>2<\/jats:sup>\n                    with stable H\n                    <jats:sub>2<\/jats:sub>\n                    production for over 1200\u00a0h at 10\u00a0mA cm\n                    <jats:sup>\u2212<\/jats:sup>\n                    <jats:sup>2<\/jats:sup>\n                    . These results demonstrate that hydrogen spillover boosts oxidative electrocatalysis, providing a general design principle for multicomponent catalysts with coordinated hydrogen dynamics.\n                  <\/jats:p>","DOI":"10.1002\/anie.5574811","type":"journal-article","created":{"date-parts":[[2026,8,19]],"date-time":"2026-08-19T09:22:23Z","timestamp":1787131343000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Accelerating H* Redistribution via Hydrogen Spillover for Enhanced Electrochemical Hydrogen Production From Formaldehyde"],"prefix":"10.1002","volume":"65","author":[{"given":"Xuanni","family":"Lin","sequence":"first","affiliation":[{"name":"Key Laboratory of Biomass Chemical Engineering of Ministry of Education, College of Chemical and Biological Engineering Zhejiang University  Hangzhou China"},{"name":"School of Biological and Chemical Engineering NingboTech University  Ningbo China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Xi","family":"Chen","sequence":"additional","affiliation":[{"name":"College of Physical Science and Technology Central China Normal University  Wuhan China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Qiannan","family":"Liu","sequence":"additional","affiliation":[{"name":"Key Laboratory of Biomass Chemical Engineering of Ministry of Education, College of Chemical and Biological Engineering Zhejiang University  Hangzhou China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-8747-3606","authenticated-orcid":false,"given":"Zhengfei","family":"Chen","sequence":"additional","affiliation":[{"name":"School of Biological and Chemical Engineering NingboTech University  Ningbo China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Weixiao","family":"Lin","sequence":"additional","affiliation":[{"name":"State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology  Wuhan China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Cheng\u2010Jie","family":"Yang","sequence":"additional","affiliation":[{"name":"Department of Physics Tamkang University  New Taipei City Taiwan"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-2861-6814","authenticated-orcid":false,"given":"Xiahan","family":"Sang","sequence":"additional","affiliation":[{"name":"State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology  Wuhan China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-3685-381X","authenticated-orcid":false,"given":"Zhongjian","family":"Li","sequence":"additional","affiliation":[{"name":"Key Laboratory of Biomass Chemical Engineering of Ministry of Education, College of Chemical and Biological Engineering Zhejiang University  Hangzhou China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-5136-9743","authenticated-orcid":false,"given":"Bin","family":"Yang","sequence":"additional","affiliation":[{"name":"Key Laboratory of Biomass Chemical Engineering of Ministry of Education, College of Chemical and Biological Engineering Zhejiang University  Hangzhou China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-4289-4677","authenticated-orcid":false,"given":"Chung\u2010Li","family":"Dong","sequence":"additional","affiliation":[{"name":"Department of Physics Tamkang University  New Taipei City Taiwan"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Qiang","family":"Zhou","sequence":"additional","affiliation":[{"name":"Zhejiang Jinhua New Material Co. 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