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While seawater electrolysis presents a promising avenue for scalable hydrogen generation, persistent challenges resulting from chlorine evolution reactions and chloride\u2010induced corrosion significantly impair system durability. Here, we introduce a breakthrough strategy coupling formaldehyde oxidation (FOR) with hydrogen evolution (HER) in seawater electrolysis, which drives the overall process at an ultralow voltage while simultaneously producing value\u2010added formate and achieving dual hydrogen generation at both electrodes. A rationally designed 3D dendritic Cu\n                    <jats:sub>0.94<\/jats:sub>\n                    Ni\n                    <jats:sub>0.06<\/jats:sub>\n                    electrocatalyst exhibits unprecedented FOR activity, delivering a remarkable current density of 629.9\u00a0mA cm\n                    <jats:sup>\u22122<\/jats:sup>\n                    at 0.2\u00a0V vs. RHE. Density functional theory (DFT) calculations elucidate that Ni doping facilitates C\u2013H bond cleavage in *OCH\n                    <jats:sub>2<\/jats:sub>\n                    OH, accelerating *H and formate formation while lowering the H\n                    <jats:sub>2<\/jats:sub>\n                    evolution barrier. An electrochemical system integrating HER and FOR achieves dual hydrogen output with a Faradaic efficiency of \u223c200% alongside \u223c100% formate selectivity. When paired with photovoltaic cells, the hybrid configuration attains a record solar\u2010to\u2010hydrogen efficiency of 39%. This work establishes an economically viable paradigm for marine hydrogen production, offering critical insights into the engineering of reaction mechanisms and the development of scalable clean energy infrastructure.\n                  <\/jats:p>","DOI":"10.1002\/smll.74804","type":"journal-article","created":{"date-parts":[[2026,7,24]],"date-time":"2026-07-24T10:41:23Z","timestamp":1784889683000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["A 3D Dendritic Cu\n                    <sub>0.94<\/sub>\n                    Ni\n                    <sub>0.06<\/sub>\n                    Electrocatalyst Enables 39% Solar\u2010to\u2010Hydrogen Efficiency via Coupled Seawater Electrolysis and Formaldehyde Oxidation"],"prefix":"10.1002","volume":"22","author":[{"given":"Xue","family":"Hao","sequence":"first","affiliation":[{"name":"State Key Laboratory of Cryogenic Science and Technology Technical Institute of Physics and Chemistry Chinese Academy of Sciences  Beijing China"},{"name":"University of Chinese Academy of Sciences  Beijing China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Xiang","family":"Huang","sequence":"additional","affiliation":[{"name":"State Key Laboratory of Quantum Functional Materials Department of Physics and Guangdong Basic Research Center of Excellence for Quantum Science Southern University of Science and Technology  Shenzhen China"},{"name":"Quantum Science Center of Guangdong\u2010Hong Kong\u2010Macao Greater Bay Area (Guangdong)  Shenzhen China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Haojing","family":"Wang","sequence":"additional","affiliation":[{"name":"State Key Laboratory of Cryogenic Science and Technology Technical Institute of Physics and Chemistry Chinese Academy of Sciences  Beijing China"},{"name":"University of Chinese Academy of Sciences  Beijing 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China"},{"name":"University of Chinese Academy of Sciences  Beijing China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-6613-5368","authenticated-orcid":false,"given":"Lixuan","family":"Mu","sequence":"additional","affiliation":[{"name":"State Key Laboratory of Cryogenic Science and Technology Technical Institute of Physics and Chemistry Chinese Academy of Sciences  Beijing China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-5747-4862","authenticated-orcid":false,"given":"Wensheng","family":"Shi","sequence":"additional","affiliation":[{"name":"State Key Laboratory of Cryogenic Science and Technology Technical Institute of Physics and Chemistry Chinese Academy of Sciences  Beijing China"},{"name":"University of Chinese Academy of Sciences  Beijing 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