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Photoanodes in bias\u2010free photoelectrochemical (PEC) systems suffer from poor H\n                    <jats:sub>2<\/jats:sub>\n                    O\n                    <jats:sub>2<\/jats:sub>\n                    selectivity at low potentials, limiting the efficiency of bipolar H\n                    <jats:sub>2<\/jats:sub>\n                    O\n                    <jats:sub>2<\/jats:sub>\n                    production. Herein, we report a rare\u2010earth ytterbium oxide (YbO\n                    <jats:sub>x<\/jats:sub>\n                    ) modified BiVO\n                    <jats:sub>4<\/jats:sub>\n                    \/WO\n                    <jats:sub>3<\/jats:sub>\n                    photoanode for efficient PEC water oxidation to H\n                    <jats:sub>2<\/jats:sub>\n                    O\n                    <jats:sub>2<\/jats:sub>\n                    . The optimized photoanode achieves a photocurrent density of 4.83\u00a0mA cm\n                    <jats:sup>\u22122<\/jats:sup>\n                    at 1.23 V\n                    <jats:sub>RHE<\/jats:sub>\n                    , an H\n                    <jats:sub>2<\/jats:sub>\n                    O\n                    <jats:sub>2<\/jats:sub>\n                    Faradaic efficiency (FE) of over 80% across the potential range of 0.6\u20131.8 V\n                    <jats:sub>RHE<\/jats:sub>\n                    , and a peak FE of 90.4% at 1.6 V\n                    <jats:sub>RHE<\/jats:sub>\n                    . Yb\n                    <jats:sup>3+<\/jats:sup>\n                    Lewis acid sites suppress the competitive four\u2010electron oxygen evolution reaction by forming Yb\u2010hydroxyl complexes, while YbO\n                    <jats:sub>x<\/jats:sub>\n                    enhances charge transfer and reduces interfacial resistance. Importantly, when coupled with a FeZnWMnYb high\u2010entropy amorphous oxide cathode for the two\u2010electron oxygen reduction reaction, the bias\u2010free tandem cell achieves \u223c160% bipolar H\n                    <jats:sub>2<\/jats:sub>\n                    O\n                    <jats:sub>2<\/jats:sub>\n                    FE. Scaling the photoelectrode to 20 cm\n                    <jats:sup>2<\/jats:sup>\n                    under 0.7 suns\u00a0illumination yields an H\n                    <jats:sub>2<\/jats:sub>\n                    O\n                    <jats:sub>2<\/jats:sub>\n                    production rate of 3.03\u00a0mmol L\n                    <jats:sup>\u22121<\/jats:sup>\n                    h\n                    <jats:sup>\u22121<\/jats:sup>\n                    . This work demonstrates a viable strategy for large\u2010scale solar\u2010driven H\n                    <jats:sub>2<\/jats:sub>\n                    O\n                    <jats:sub>2<\/jats:sub>\n                    synthesis for environmental applications.\n                  <\/jats:p>","DOI":"10.1002\/anie.3694210","type":"journal-article","created":{"date-parts":[[2026,10,15]],"date-time":"2026-10-15T03:48:16Z","timestamp":1792036096000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Efficient Bipolar Hydrogen Peroxide Production Through Photoelectrochemistry"],"prefix":"10.1002","author":[{"given":"Bo","family":"Yang","sequence":"first","affiliation":[{"name":"College of Chemistry and Chemical Engineering College of Energy Material and Chemistry Inner Mongolia University  Hohhot China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Shijie","family":"Ren","sequence":"additional","affiliation":[{"name":"College of Chemistry and Chemical Engineering College of Energy Material and Chemistry Inner Mongolia University  Hohhot China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-7140-7305","authenticated-orcid":false,"given":"Rui\u2010Ting","family":"Gao","sequence":"additional","affiliation":[{"name":"College of Chemistry and Chemical Engineering College of Energy Material and Chemistry Inner Mongolia University  Hohhot China"},{"name":"College of Smart Materials and Future Energy Fudan University  Shanghai China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-4410-6021","authenticated-orcid":false,"given":"Yang","family":"Yang","sequence":"additional","affiliation":[{"name":"NanoScience Technology Center Department of Materials Science and Engineering Department of Chemistry, Renewable Energy and Chemical Transformation Cluster, The Stephen W. Hawking Center For Microgravity Research and Education University of Central Florida  Orlando Florida USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-2132-340X","authenticated-orcid":false,"given":"Mu","family":"Xiao","sequence":"additional","affiliation":[{"name":"School of Chemical Engineering The University of Queensland, St Lucia  Brisbane Queensland Australia"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Limin","family":"Wu","sequence":"additional","affiliation":[{"name":"College of Chemistry and Chemical Engineering College of Energy Material and Chemistry Inner Mongolia University  Hohhot China"},{"name":"College of Smart Materials and Future Energy Fudan University  Shanghai China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-7449-2763","authenticated-orcid":false,"given":"Lei","family":"Wang","sequence":"additional","affiliation":[{"name":"College of 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