Dimethylammonium iodide stabilized bismuth halide perovskite photocatalyst for hydrogen evolution

• 作 者: He Zhao Kalyani Chordiya Petri Leukkunen Alexey Popov Mousumi Upadhyay Kahaly Krisztian Kordas Satu Ojala
• 机 构: Environmental and Chemical Engineering Research Unit,University of Oulu,P.O.Box 4300,FI-90014 Oulu,F
• 出 处: 纳米研究（英文版）
• 发表日期: 2021年4期
• 关键词: bismuth halide perovskite dimethylammonium iodide photocatalysis hydrogen evolut

Metal halide perovskites have emerged as novel and promising photocatalysts for hydrogen generation.Currently,their stability in water is a vital and urgent research question.In this paper a novel approach to stabilize a bismuth halide perovskite[(CH3)2NH2]3[Bil6](DA3BiI6) in water using dimethylammonium iodide (DAI) without the assistance of acids or coatings is reported.The DA3Bil6 powder exhibits good stability in DAI solutions for at least two weeks.The concentration of DAI is found as a critical parameter,where the I-ions play the key role in the stabilization.The stability of DA3Bil6 in water is realized via a surface dissolution-recrystallization process.Stabilized DA3Bil6 demonstrates constant photocatalytic properties for visible light-induced photo-oxidation of I-ions and with PtCl4 as a co-catalyst (Pt-DA3Bil6),photocatalytic H2 evolution with a rate of 5.7 pmol·h-1 from HI in DAI solution,obtaining an apparent quantum efficiency of 0.83％ at 535 nm.This study provides new insights on the stabilization of metal halide perovskites for photocatalysis in aqueous solution.