期刊
SMALL METHODS
卷 6, 期 8, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/smtd.202200326
关键词
bandgap funneling; hydrogen evolution; lead-free hybrid perovskites; photocatalysis
资金
- Research Grants Council of Hong Kong [CityU 21203518, F-CityU106/18, 9048121]
- City University of Hong Kong [9667229, 7005289, 7005580, 7005720, 9680208, 9667213, 9680331, 9052029]
- Shenzhen Science Technology and Innovation Commission [JCYJ20210324125612035, R-IND12303, R-IND12304]
- National Natural Science Foundation of China [61874165, 21833009, 22071070]
- Australian Research Council (ARC) Discovery Early Career Researcher Award [DE160100589]
- Major State Basic Research Development Program of China [2019YFB1503401]
By developing a novel environmentally friendly mixed halide perovskite MA(3)Bi(2)Cl(9-x)I(x), visible-light photocatalytic hydrogen production is achieved, and the bandgap funnel structure promotes photoinduced charge transfer, leading to enhanced photocatalytic redox reaction efficiency.
The photocatalytic system using hydrohalic acid (HX) for hydrogen production is a promising strategy to generate clean and renewable fuels as well as value-added chemicals (such as X-2/X-3(-)). However, it is still challenging to develop a visible-light active and strong-acid resistive photocatalyst. Hybrid perovskites have been recognized as a potential photocatalyst for photovoltaic HX splitting. Herein, a novel environmentally friendly mixed halide perovskite MA(3)Bi(2)Cl(9-x)I(x) with a bandgap funnel structure is developed, i.e., confirmed by energy dispersive X-ray analysis and density functional theory calculations. Due to gradient neutral formation energy within iodine-doped MA(3)Bi(2)Cl(9), the concentration of iodide element decreases from the surface to the interior across the MA(3)Bi(2)Cl(9-x)I(x) perovskite. Because of the aligned energy levels of iodide/chloride-mixed MA(3)Bi(2)Cl(9-x)I(x), a graded bandgap funnel structure is therefore formed, leading to the promotion of photoinduced charge transfer from the interior to the surface for efficient photocatalytic redox reaction. As a result, the hydrogen generation rate of the optimized MA(3)Bi(2)Cl(9-x)I(x) is enhanced up to approximate to 341 +/- 61.7 mu mol h(-1) with a Pt co-catalyst under visible light irradiation.
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