Bandgap Funneling in Bismuth‐Based Hybrid Perovskite Photocatalyst with Efficient Visible‐Light‐Driven Hydrogen Evolution
Research output: Journal Publications and Reviews › RGC 21 - Publication in refereed journal › peer-review
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Detail(s)
Original language | English |
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Article number | 2200326 |
Journal / Publication | Small Methods |
Volume | 6 |
Issue number | 8 |
Online published | 22 Jun 2022 |
Publication status | Published - 18 Aug 2022 |
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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.
In: Small Methods, Vol. 6, No. 8, 2200326, 18.08.2022.
Research output: Journal Publications and Reviews › RGC 21 - Publication in refereed journal › peer-review