N-doped porous carbon-stabilized Pt in hollow nano-TiO2 with enhanced photocatalytic activity. (21st September 2020)

• Record Type: Journal Article
• Authors: Chen, Nan; Gong, Qingna; Wang, Fei; Ren, Jun; Wang, Ruixin; Jiao, Weizhou
• Is Part Of: International journal of hydrogen energy. Volume 45:Number 46(2020)
• Page Start: 24779
• Page End: 24791
• Publication Date: 2020-09-21
• Subjects: N-doped mesoporous carbon -- Pt nanoclusters -- Hollow photocatalysts -- Stabilization -- Photocatalytic hydrogen evolution; Hydrogen as fuel -- Periodicals; Hydrogène (Combustible) -- Périodiques; Hydrogen as fuel; Periodicals; 665.81
• DOI: 10.1016/j.ijhydene.2020.06.275
• Languages: English
• ISSNs: 0360-3199

Abstract

Abstract: In this study, Pt nanoclusters with small sizes (~1.8 nm) is designed and loaded onto the inner surface of hollow nano-TiO2 through combining polymer anchoring and photochemical solid-phase reduction strategy. The N-doped mesoporous carbon derived from the polymer is beneficial for the exposure of Pt sites and stabilization of Pt nanoclusters (~1.8 nm), and supplying more active N-sites. More importantly, the pore structure of the N-doped mesoporous carbon layer prepared by air-etching method contributes to the diffusion of reactants/products and exposure of more active Pt sites to promote surface reactions. The as-prepared C/Pt@TiO2 -3% with 0.54 wt% of Pt shows the largest total pore volume (0.46 cm 3 g −1 ) with an average pore size of ~3 nm, and its catalytic activity is greatly improved with a H2 evolution rate of 9086 μmol h −1 g −1, which is about 48 and 96 times that of bare hollow nano-TiO2 and P25, respectively. In addition, the as-prepared C/Pt@TiO2 -3% shows good durability in a 40-h cyclic test. Graphical abstract: Image 1 Highlights: Air-etching is proposed to control mesoporous structure of the hollow composite. Size and dispersion of Pt nanoclusters was controlled by N-doped mesoporous carbon. N-doped mesoporous carbon enhanced the photocatalytic activity and durability. Polymer anchoring and photochemical solid-phase reduction method were combined.