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However, achieving high NH\n                    <jats:sub>3<\/jats:sub>\n                    selectivity across a broad potential window, which is crucial for integration with fluctuating renewable energy sources, remains challenging due to difficulties in precisely controlling the active hydrogen supply. Herein, a hydrogen spillover strategy is presented to address this challenge by optimizing hydrogen activity. This strategy is realized using a Pt nanoparticle decorated nanoporous Co\n                    <jats:sub>2<\/jats:sub>\n                    P (Pt\/np\u2010Co\n                    <jats:sub>2<\/jats:sub>\n                    P) catalyst. In situ Fourier transform infrared spectroscopy, density functional theory calculations, and a suite of control experiments reveal that Pt nanoparticles generate active hydrogen, which migrates via the spillover pathway to hydrogenate *NO on Co\n                    <jats:sub>2<\/jats:sub>\n                    P. This process significantly lowers both thermodynamic and kinetic barriers for *NO hydrogenation. As a result, the Pt\/np\u2010Co\n                    <jats:sub>2<\/jats:sub>\n                    P catalyst maintains a Faradaic efficiency (FE) above 90% across a wide 600\u00a0mV potential window by ensuring sufficient *H availability at low overpotentials and suppressing the competing hydrogen evolution reaction at high overpotentials. The FE approaches 100% at an industrially relevant current density of \u22481 A cm\n                    <jats:sup>\u22122<\/jats:sup>\n                    . Similar performance enhancements observed for other noble metal\u2013decorated np\u2010Co\n                    <jats:sub>2<\/jats:sub>\n                    P confirm the universality of hydrogen spillover strategy for designing efficient catalysts toward practical ammonia synthesis.\n                  <\/jats:p>","DOI":"10.1002\/adma.202518272","type":"journal-article","created":{"date-parts":[[2025,12,6]],"date-time":"2025-12-06T13:33:39Z","timestamp":1765028019000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":23,"title":["Tuning Active Hydrogen via Spillover Enables the Wide\u2010Potential Electrochemical Reduction of Nitrate to Ammonia"],"prefix":"10.1002","volume":"38","author":[{"given":"Xue","family":"Zhou","sequence":"first","affiliation":[{"name":"School of Materials Science and Engineering Tianjin University  Tianjin 300350 China"},{"name":"School of Chemical and Biomolecular Engineering and ARC Centre of 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