Dang H.VWang Y.HWu J.C.S.JEFFREY CHI-SHENG WU2022-03-222022-03-22202201694332https://www.scopus.com/inward/record.uri?eid=2-s2.0-85116011434&doi=10.1016%2fj.apsusc.2021.151346&partnerID=40&md5=be778ef2c43ed57bc195005c670bd9c7https://scholars.lib.ntu.edu.tw/handle/123456789/598213Solar-driven photocatalytic seawater splitting for hydrogen is a promising process because of unlimited solar energy and seawater available. A novel Pt/GaP-C3N4 (PGC) heterogeneous photocatalyst was fabricated and used for photocatalytic artificial and natural seawater splitting under simulated sunlight illumination. The hybrid heterojunction structure of GaP-C3N4 promotes a Z-schematic electron migration and depresses the recombination rate of photogenerated electron-hole pairs in PGC photocatalyst. Under 4-hour simulated sunlight irradiation, the optimum composite 0.3PGC50 (0.3 wt% Pt-loaded and 50 wt% GaP-composited) exhibited high photoactivity performance with the hydrogen/oxygen evolution rate (HER/OER) of 46.5/23.4 ?mol g?1 in deionized water, 65.5/34.3 ?mol g?1 in the artificial seawater, and 53.9/24.9 ?mol g?1 in the natural seawater splitting process. The apparent quantum yield of artificial seawater is near two times higher than that of pure water. The molar ratio of H2:O2 was near 2:1 matched whole water splitting, and the H2 yields were moderately decreased after 3 consecutive runs. ? 2021 Elsevier B.V.Carbon nitrideGallium phosphidePhotocatalytic seawater splittingSunlight irradiationZ-scheme photocatalystIII-V semiconductorsIrradiationMolar ratioPhotocatalytic activitySeawaterSolar energySolar power generationArtificial seawaterElectron migrationHeterogeneous photocatalystsHeterojunction structuresPhoto-catalyticSimulated sunlightSplittingsHeterojunctions[SDGs]SDG7[SDGs]SDG14journal article10.1016/j.apsusc.2021.1513462-s2.0-85116011434