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Band-gap funneling in bismuth-based hybrid perovskite photocatalyst with efficient visible-light-driven hydrogen evolution



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 h1 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.

DOI: 10.1002/smtd.202200326

First published: 22 June 2022

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Our work has been highlighted on the Back Cover of Small Methods by Wiley publisher, preview:


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