PtS quantum dots/Nb2O5 nanosheets with accelerated charge transfer for boosting photocatalytic H2 production

Hang Xiao; Tian Wei; Xin Ren; Bo Lin; Guidong Yang

doi:10.1039/d2nr03112d

PtS quantum dots/Nb₂O₅ nanosheets with accelerated charge transfer for boosting photocatalytic H₂ production

Nanoscale. 2022 Sep 2;14(34):12403-12408. doi: 10.1039/d2nr03112d.

Authors

Hang Xiao¹, Tian Wei¹, Xin Ren¹, Bo Lin¹, Guidong Yang¹

Affiliation

¹ XJTU-Oxford International Joint Laboratory for Catalysis, School of Chemical Engineering and Technology, Xi'an Jiaotong University, Xi'an, Shaanxi 710049, China. bolinscet@xjtu.edu.cn.

PMID: 35971973
DOI: 10.1039/d2nr03112d

Abstract

The rapid recombination rate of charges limits the improvement of photocatalytic hydrogen evolution performance related to semiconductor photocatalysts. An effective strategy to accelerate charge separation and transfer is the design and construction of new high-efficiency cocatalysts on photocatalysts. Herein, a system of PtS quantum dots/Nb₂O₅ nanosheets (PtS/Nb₂O₅) was constructed via the in situ vapor phase (ISVP) synthesis process. The conclusions from ultrafast femtosecond-resolved TA spectroscopy indicated that the lifetime of the photogenerated charges of PtS/Nb₂O₅ (6073.75 ps) was shortened markedly in contrast to that of Nb₂O₅ (6634.05 ps), manifesting the facilitated separation and transfer of photogenerated charges caused by the quantum-dot-structured PtS cocatalyst. The enhanced charge separation and transfer capacity contributes to an excellent H₂ production rate of 182.5 μmol h^-1 for PtS/Nb₂O₅, which is up to 3.4 and 12.2 times that of Pt/Nb₂O₅ and Nb₂O₅, respectively. This work brings up new avenues for constructing unique and effective photocatalysts via the cocatalyst design.