光催化
铋
钙钛矿(结构)
带隙
可见光谱
材料科学
催化作用
纳米技术
化学
化学工程
光电子学
冶金
生物化学
工程类
作者
Yunqi Tang,Chun Hong Mak,Chen Wang,Yu Fu,Fangfang Li,Guohua Jia,Chang‐Wei Hsieh,Hsin‐Hui Shen,Juan Carlos Colmenares,Haisheng Song,Mingjian Yuan,Yue Chen,Hsien‐Yi Hsu
标识
DOI:10.1002/smtd.202200326
摘要
Abstract 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 ≈341 ± 61.7 µmol h −1 with a Pt co‐catalyst under visible light irradiation.
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