Issue 12, 2023

Spatial separation of photogenerated charges on the anisotropic facets of cuprous oxide

Abstract

Anisotropic facet engineering is an intriguing way to regulate the charge-separation behavior on a semiconductor photocatalyst. Here we show the morphology tailoring of cuprous oxide (Cu2O) from cubic to octahedral and truncated octahedral crystals, and apply Kelvin probe force microscopy to image the photogenerated charge separation on exposed anisotropic facets. The facet junction was observed to greatly improve charge separation efficiency, wherein the photo-induced electrons and holes tend to accumulate on the {100} and {111} facets, respectively. We further correlate the facet-dependent photocorrosion of Cu2O in a photoelectrochemical process with the self-reduction from photo-induced electrons. Our results illuminate the crucial role of anisotropic facet engineering in the regulation of photogenerated charge behaviors and surface reactions in photocatalytic energy conversion.

Graphical abstract: Spatial separation of photogenerated charges on the anisotropic facets of cuprous oxide

Supplementary files

Article information

Article type
Research Article
Submitted
10 mars 2023
Accepted
09 mai 2023
First published
15 mai 2023

Inorg. Chem. Front., 2023,10, 3550-3557

Spatial separation of photogenerated charges on the anisotropic facets of cuprous oxide

T. Su, C. Yang, F. Niu, Y. Hua, Q. Xu, K. Hu and L. Zhang, Inorg. Chem. Front., 2023, 10, 3550 DOI: 10.1039/D3QI00455D

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