Dimethylammonium iodide stabilized bismuth halide perovskite photocatalyst for hydrogen evolution
Zhao, He; Chordiya, Kalyani; Leukkunen, Petri; Popov, Alexey; Kahaly, Mousumi Upadhyay; Kordas, Krisztian; Ojala, Satu (2020-10-28)
Zhao, H., Chordiya, K., Leukkunen, P. et al. Dimethylammonium iodide stabilized bismuth halide perovskite photocatalyst for hydrogen evolution. Nano Res. 14, 1116–1125 (2021). https://doi.org/10.1007/s12274-020-3159-0
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https://urn.fi/URN:NBN:fi-fe2020111992056
Tiivistelmä
Abstract
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[BiI₆] (DA₃BiI₆) in water using dimethylammonium iodide (DAI) without the assistance of acids or coatings is reported. The DA₃BiI6 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 DA₃BiI6 in water is realized via a surface dissolution–recrystallization process. Stabilized DA₃BiI₆ demonstrates constant photocatalytic properties for visible light-induced photo-oxidation of I⁻ ions and with PtCl₄ as a co-catalyst (Pt-DA₃BiI₆), photocatalytic H₂ evolution with a rate of 5.7 μmol⋅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.
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