In-Situ Constructing Eosin Y Sensitized Cs2PtSnCl6 Perovskites for Enhanced Photocatalytic Hydrogen Evolution

Abstract

Vacancy-ordered Cs2SnX6 perovskites, with low-toxicity and high stability, have emerged as promising photocatalysts for hydrogen evolution reaction (HER). However, most Cs2SnX6 and derivatives have low catalytic activity mainly due to their insufficient light utilization efficiency. Herein, a simple in situ method is introduced to sensitize Cs2PtSnCl6 with Eosin Y (EY), forming EY-Cs2PtSnCl6 for HER in aqueous solution. Various characterizations indicate that the EY is immobilized onto the Cs2PtSnCl6 during the synthesis process. The EY-Cs2PtSnCl6 displayed extended light absorption range and efficient charge transfer from EY to Cs2PtSnCl6. The resulting EY-Cs2PtSnCl6 material exhibits high HER rate of 17.6 mmol g−1 h−1, ≈1760 folds than that of the pristine Cs2PtSnCl6. This work demonstrates an effective method to construct dye-sensitized perovskites and highlights the importance of interaction between dye and perovskite. It provides useful guidance for the design of new perovskite-based photocatalysts and it will advance the development of perovskites for solar energy conversion into renewable fuels.