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 X2/X3−). 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 MA3Bi2Cl9 – xIx 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 MA3Bi2Cl9, the concentration of iodide element decreases from the surface to the interior across the MA3Bi2Cl9 – xIx perovskite. Because of the aligned energy levels of iodide/chloride-mixed MA3Bi2Cl9 – xIx, 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 MA3Bi2Cl9 – xIx is enhanced up to ≈341 ± 61.7 µmol h−1 with a Pt co-catalyst under visible light irradiation.
by Yunqi Tang, Chun Hong Mak, Chen Wang, Yu Fu, Fang-Fang Li, Guohua Jia, Chang-Wei Hsieh, Hsin-Hui Shen, Juan Carlos Colmenares, Haisheng Song, Mingjian Yuan, Yue Chen, Hsien-Yi Hsu. Small Methods journal 2022.
First published: 22 June 2022
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