Susanti A.Phanthuwongpakdee J.Sudrajat H.Mahidol University2026-06-202026-06-202026-01-01Materials Science Forum Vol.1194 (2026) , 115-12002555476https://repository.li.mahidol.ac.th/handle/123456789/117432The incorporation of quasi-atomic Ni(OH)₂ clusters onto graphitic C₃N₄ (gCN) remarkably enhances the photocatalytic production of hydrogen peroxide (H₂O₂) and benzaldehyde (BAL) from benzyl alcohol (BA) in water under visible light at 440 nm. Upon loading Ni(OH)₂, H₂O₂ production reaches 306 µmol g⁻¹ h⁻¹ and BAL production reaches 270 µmol L⁻¹ h⁻¹. The high photocatalytic performance is attributed to the formation of ultrasmall clusters of Ni(OH)₂, which reduce recombination by trapping holes, thereby increasing the activity (BA conversion). Efficient hole transfer to BA is also facilitated, enhancing selectivity (BAL selectivity). Upon the addition of Ni(OH)₂, the steady-state electron population photoexcited by visible light increases 5.5-fold. The proposed modification of gCN with Ni achieves nearly 100% efficiency in both activity and selectivity to produce H₂O₂, while also generating BAL, a value-added product. This demonstrates its potential for sustainable chemical transformations using visible light and water as a green solvent.Materials SciencePhysics and AstronomyEngineeringBook ChapterSCOPUS10.4028/p-UrkzL72-s2.0-10504161921316629752