Photocatalytic hydrogen production enhancement of Z-Scheme CdS quantum dots/Ni2P/Black Ti3+–TiO2 nanotubes with dual-functional Ni2P nanosheets. (27th November 2020)

• Record Type: Journal Article
• Authors: Pan, Jiaqi; Ou, Wei; Li, Shi; Chen, Yipu; Li, Hongli; Liu, Yanyan; Wang, Jingjing; Song, Changsheng; Zheng, Yingying; Li, Chaorong
• Is Part Of: International journal of hydrogen energy. Volume 45:Number 58(2020)
• Page Start: 33478
• Page End: 33490
• Publication Date: 2020-11-27
• Subjects: Ni2P -- Z-Scheme -- Ti3+-self doping -- Photocatalytic hydrogen production; Hydrogen as fuel -- Periodicals; Hydrogène (Combustible) -- Périodiques; Hydrogen as fuel; Periodicals; 665.81
• DOI: 10.1016/j.ijhydene.2020.09.084
• Languages: English
• ISSNs: 0360-3199

Abstract

Abstract: The Z-Scheme CdS quantum dots/Ni2 P/Black Ti 3+ –TiO2 nanotubes with dual-functional Ni2 P nanosheets are fabricated by a continuously electrospinning-annealing/reduction-chemical deposition method, there, the TiO2 nanotubes are fabricated via electrospinning, subsequently, the 2D Ni2 P lamellas grow on the surface of nanotubes and the Ti 3+ /Ov ions are introduced by reduction, then CdS QDs are deposited on the surface of Ni2 P lamellas. Evaluated by the photocatalytic hydrogen production, the photocatalytic performance of Z-Scheme CdS QDs/Ni2 P/B–TiO2 (~3303.85 μmol/g h) exhibits an obvious enhancement of about ~70 folds than unmodified TiO2 . The main reasons for the HER enhancement are ascribed to that the Pt-like behavior 2D Ni2 P and Ti 3+ ions can accelerate the photo-generated electrons diffusing into water and reduce H2 activation barrier, the Z-Scheme heterojunction can accelerate the separating and transferring of photo-generated charge carriers, the Ov ions and hollow nanotubes can increase solar utilization, which can be supported by the electrochemical measurements. Graphical abstract: Image 1 Highlights: Pt-like Ni2 P and Ti 3+ can accelerate photo-electron diffusing into water quickly. Z-Scheme heterojunction can accelerate charge carriers separating/transferring. Ov and hollow nanotubes can increase the solar utilization and stability.