2D/Quasi-2D Ruddlesden–Popper Perovskite: A High-Performance Photocatalyst for Hydrogen Evolution
Hui Fu, Xiaolei Liu, Jinyu Fu, Yaqiang Wu, Qianqian Zhang, Zeyan Wang, Yuanyuan Liu, Zhaoke Zheng, Hefeng Cheng, Ying Dai, Baibiao Huang, Peng Wang
Abstract
In recent years, two-dimensional (2D) and quasi-2D Ruddlesden–Popper (RP) perovskite materials have been developed as emerging semiconductor materials for solar cells due to their structural diversity and high power-conversion efficiency, but there are few reports on the photocatalytic applications. Here, 2D/quasi-2D RP BA 2 MA n –1 Pb n I 3 n +1 perovskite was fabricated as a hydrogen evolution photocatalyst for hydrohalic acid splitting. Theoretical and experimental surveys show that the stress in BA 2 MA n –1 Pb n I 3 n +1 can significantly influence the photoelectronic properties. More importantly, charge carrier dynamics investigation shows that the quasi-2D perovskite with a high n value has more efficient charge transport and separation capability, obtaining the highest photocatalytic activity. When loading with Pt as the cocatalyst, 2.0 wt % Pt/BA 2 MA 3 Pb 4 I 13 exhibits a superior photocatalytic H 2 evolution activity of 394.8 μmol h –1 with an STH (solar-to-hydrogen efficiency) of 1.21%, better than most reported 3D perovskite photocatalysts. This work is expected to provide insights into expanding metal halide perovskite-based photocatalysts for efficient photocatalytic H 2 evolution.