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This necessitates an indirect route through the production and compression of high\u2010purity H\n                    <jats:sub>2<\/jats:sub>\n                    gas. We present an alternative synthetic route by repurposing acidic corrosion and hydrogen embrittlement to engineer an in situ hydrogen\u2010trapping cage (HTC) within metals. The HTC enables direct proton\u2011to\u2011hydride conversion under mild conditions (ambient pressure, \u223c70\u00a0% lower temperature). By using protons directly from acids as the hydrogen source, this approach bypasses the need for high\u2010pressure H\n                    <jats:sub>2<\/jats:sub>\n                    gas, enabling hydride synthesis at ambient pressure and substantially lower temperatures. The process simultaneously constructs a defect\u2010rich microstructure in situ, facilitating rapid ion transport. Guided by the universal criterion |\u0394\n                    <jats:italic>P<\/jats:italic>\n                    <jats:sub>eq<\/jats:sub>\n                    | &gt; \u0394\n                    <jats:italic>P<\/jats:italic>\n                    <jats:sub>ph<\/jats:sub>\n                    , we demonstrate the versatility of our method by synthesizing a library of over 20 hydrides, including LiH and NaH; its functional power is exemplified by a cage\u2010rich HTC\u2010TiH\n                    <jats:sub>2<\/jats:sub>\n                    electrocatalyst, which achieves a nitrate\u2010to\u2010ammonia current density of 1.07 A cm\n                    <jats:sup>\u22122<\/jats:sup>\n                    via enhanced H\n                    <jats:sup>\u2212<\/jats:sup>\n                    mobility. This work demonstrates a strategy that couples hydrogen capture, stabilization, and conversion within a single material system, providing a potential route for sustainable hydrogen management.\n                  <\/jats:p>","DOI":"10.1002\/anie.9905804","type":"journal-article","created":{"date-parts":[[2026,9,4]],"date-time":"2026-09-04T09:13:08Z","timestamp":1788513188000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Hydrogen\u2010Trapping Cage Engineering Enables Mild\u2010Condition, Direct Proton Conversion to Functional Metal Hydrides"],"prefix":"10.1002","volume":"65","author":[{"given":"Ankang","family":"Chen","sequence":"first","affiliation":[{"name":"State Key Laboratory of High Pressure and Superhard Materials Synergetic Extreme Condition High\u2010Pressure Science Center College of Physics Jilin University  Changchun 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College of Physics Jilin University  Changchun China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-5148-1620","authenticated-orcid":false,"given":"Bao","family":"Yuan","sequence":"additional","affiliation":[{"name":"Spallation Neutron Source Science Center Institute of High Energy Physics Chinese Academy of Sciences (CAS)  Dongguan China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-6878-1830","authenticated-orcid":false,"given":"Defang","family":"Duan","sequence":"additional","affiliation":[{"name":"State Key Laboratory of High Pressure and Superhard Materials Synergetic Extreme Condition High\u2010Pressure Science Center College of Physics Jilin University  Changchun China"},{"name":"Key Laboratory of Material Simulation Methods and Software of Ministry of Education College of Physics  Changchun 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