Issue 29, 2024

Achieving long-lived photogenerated holes in ZnIn2S4 loaded with CoOx clusters for enhanced photocatalytic pure water splitting

Abstract

The photocatalytic pure water splitting performance of photocatalysts is still restricted by the low utilization efficiency of photogenerated holes. Recent studies suggest that metal oxide clusters can efficiently abstract holes from a bulk photocatalyst via discrete energy bands. However, the decay dynamics of excited states in such a heterostructure have not been explored. Herein, ultra-small CoOx clusters decorated on ZnIn2S4 (ZIS) are prepared for pure water splitting. Experimental characterization studies confirm that CoOx clusters efficiently capture holes from ZnIn2S4, thus inhibiting charge recombination. Femtosecond transient absorption spectroscopy (fs-TAS) reveals that the lifetime of holes trapped by CoOx clusters is prolonged to 911.6 ps, enabling more opportunities to participate in the surface reaction. Moreover, density functional theory calculation suggests that the CoOx cluster is the preferential adsorption site for H2O to boost surface water oxidation. Benefiting from the above factors, the optimized CoOx/ZIS shows improved H2 and H2O2 evolution rates of 404.1 μmol g−1 h−1 and 371.9 μmol g−1 h−1 under visible light irradiation, respectively, which are about ten times higher than that of pure ZIS. The study highlights the significance of efficient hole extraction for improving photocatalytic pure water splitting performance.

Graphical abstract: Achieving long-lived photogenerated holes in ZnIn2S4 loaded with CoOx clusters for enhanced photocatalytic pure water splitting

Supplementary files

Article information

Article type
Paper
Submitted
16 Apr 2024
Accepted
12 Jun 2024
First published
12 Jun 2024

J. Mater. Chem. A, 2024,12, 18204-18213

Achieving long-lived photogenerated holes in ZnIn2S4 loaded with CoOx clusters for enhanced photocatalytic pure water splitting

Q. Zhang, S. Yuan, H. Yin, J. Yang and Z. Guan, J. Mater. Chem. A, 2024, 12, 18204 DOI: 10.1039/D4TA02620A

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