Bandgap Funneling in Bismuth‐Based Hybrid Perovskite Photocatalyst with Efficient Visible‐Light‐Driven Hydrogen Evolution

Research output: Journal Publications and ReviewsRGC 21 - Publication in refereed journalpeer-review

21 Scopus Citations
View graph of relations

Author(s)

  • Chen Wang
  • Yu Fu
  • Fang-Fang Li
  • Guohua Jia
  • Chang-Wei Hsieh
  • Hsin-Hui Shen
  • Juan Carlos Colmenares
  • Haisheng Song
  • Mingjian Yuan
  • Yue Chen

Detail(s)

Original languageEnglish
Article number2200326
Journal / PublicationSmall Methods
Volume6
Issue number8
Online published22 Jun 2022
Publication statusPublished - 18 Aug 2022

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 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.

Research Area(s)

  • bandgap funneling, hydrogen evolution, lead-free hybrid perovskites, photocatalysis

Citation Format(s)

Bandgap Funneling in Bismuth‐Based Hybrid Perovskite Photocatalyst with Efficient Visible‐Light‐Driven Hydrogen Evolution. / Tang, Yunqi; Mak, Chun Hong; Wang, Chen et al.
In: Small Methods, Vol. 6, No. 8, 2200326, 18.08.2022.

Research output: Journal Publications and ReviewsRGC 21 - Publication in refereed journalpeer-review