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To overcome these obstacles, ligand\u2010free platinum bismuth (PtBi) alloy nanoparticles (\u22482\u00a0nm) are synthesized via femtosecond laser liquid ablation under nonequilibrium conditions, yielding metastable structures with tunable elemental compositions populated with defects. The Pt\n                    <jats:sub>4<\/jats:sub>\n                    Bi\/C catalyst excels in alkaline methanol oxidation reaction (MOR), delivering a mass activity of 17.7 A\u00a0mg\n                    <jats:sup>\u22121<\/jats:sup>\n                    <jats:sub>pt<\/jats:sub>\n                    (11.5 times higher than 20% Pt\/C) and a specific activity of 54.9\u00a0mA cm\n                    <jats:sup>\u22122<\/jats:sup>\n                    .\n                    <jats:italic>In\u2010situ<\/jats:italic>\n                    Fourier transform infrared spectroscopy and ambient pressure X\u2010ray photoelectron spectroscopy reveal a CO\u2010free pathway enabled by Bi, reducing catalyst poisoning. Density functional theory calculations show that PtBi\u2500O lowers d\u2010band center of Pt, weakening the adsorption of *CO, promoting the adsorption of *OH, and lowering the energy barrier from *CHO to *HCOOH. As an example, a hybrid MOR\u2013hydrogen evolution reaction (HER)\u00a0electrolyzer demonstrates reduced voltage, suppresses side reactions, improves catalyst durability, achieves 545\u00a0mV at 10\u00a0mA cm\n                    <jats:sup>\u22122<\/jats:sup>\n                    , and maintains stability for 54 h below 1.1\u00a0V in natural seawater. This study demonstrates the efficacy of PtBi nanoalloys in efficient MOR catalysis for hybrid electrolysis systems toward sustainable hydrogen production.\n                  <\/jats:p>","DOI":"10.1002\/advs.202510123","type":"journal-article","created":{"date-parts":[[2025,8,18]],"date-time":"2025-08-18T08:57:17Z","timestamp":1755507437000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":7,"title":["Femtosecond\u2010Laser Synthesized PtBi Nanoalloys for Efficient Methanol Oxidation in Hybrid Electrolysis"],"prefix":"10.1002","volume":"12","author":[{"given":"Xianze","family":"Zhang","sequence":"first","affiliation":[{"name":"Laser Micro\/Nano\u2010Fabrication Laboratory School of Mechanical Engineering Beijing Institute of Technology  Beijing 100081 China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Zikang","family":"Su","sequence":"additional","affiliation":[{"name":"Laser Micro\/Nano\u2010Fabrication 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