Journal
APPLIED SURFACE SCIENCE
Volume 572, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.apsusc.2021.151346
Keywords
Photocatalytic seawater splitting; Sunlight irradiation; Z-scheme photocatalyst; Carbon nitride; Gallium phosphide
Categories
Funding
- Ministry of Science and Technology (MOST), Taiwan [MOST 108-2923-E-002-006-MY3]
- Academia Sinica of Taiwan [AS-KPQ-106-DDPP]
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Researchers fabricated a Pt/GaP-C3N4 photocatalyst for solar-driven photocatalytic seawater splitting, showing high photoactivity and stability in various solutions.
Solar-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 mu mol g(-1) in deionized water, 65.5/34.3 mu mol g(-1) in the artificial seawater, and 53.9/24.9 mu 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 H-2:O-2 was near 2:1 matched whole water splitting, and the H-2 yields were moderately decreased after 3 consecutive runs.
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