Journal
APPLIED CATALYSIS B-ENVIRONMENTAL
Volume 254, Issue -, Pages 194-205Publisher
ELSEVIER
DOI: 10.1016/j.apcatb.2019.04.091
Keywords
CdS/Pt-N-TiO2; Water splitting; Z-Scheme; EPR; Photocorrosion; CdS
Funding
- European Union (European Social Fund- ESF) through the Operational Programme Human Resources Development, Education and Lifelong Learning [MIS-5000432]
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( )22Z-Scheme CdS/Pt-N-TiO2 and CdS/Pt-N,FTiO2 nanocatalysts were synthesized using a sol - gel impregnation method and evaluated for their photocatalytic H-2/O-2 production via overall water splitting, with no extrernal electron or hole acceptors. The 0.5CdS/Pt-N-TiO2 material achieved a photocatlytic production of 639 mu mol/g/h of H-2 in tandem with 319 mu mol/g/h of O-2. The photocatalytic H-2/O-2 production data show that N-incorporation in the TiO2 lattice boosts overall water splitting, while F-incorporation inhibits the catalytic performance. Quantitative monitoring of the photogenerated Ti3+-surface and TO3+-lattice electrons, as well as of the photogenerated holes (h(+)) by Electron Parmagnetic Resonce spectrsocopy, show that CdS/Pt-N-TiO2 achieves en- hanced e(-)/h(+) photogeneration due to intraband states generated by N-dopping, facilitating the flow of elec- trons via Pt to the valence band of CdS. The leaching of Cd2+ ions' due to phootocorrosion of the CdS quantum dots, was montiored in-situ using Anodic StrippingVoltammtery (ASV). The Cd2+ leaching data reveal a severe inhibition of CdS photocorrosion ofN-dopped catalysts, CdS/Pt-N-TiO2. This reveals a dual beneficial role of Natoms: [i] boosting the visible light photocactivity, and [ii] inhibiting CdS photocorrosoion. A consistent Zscheme reaction mechanism is proposed for the catalytic H-2,O-2 production by CdS/Pt-N-TiO2 and CdS/Pt-N-FTiO2 heterojunctions, taking into account the photoinduced e(-)/h(+) dynamics as well as the interfacial {CdS}/{Pt-N/F-TiO2} chemistry.
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