4.6 Article

Patterning alternate TiO2 and Cu2O strips on a conductive substrate as film photocatalyst for Z-scheme photocatalytic water splitting

Journal

SCIENCE BULLETIN
Volume 67, Issue 23, Pages 2420-2427

Publisher

ELSEVIER
DOI: 10.1016/j.scib.2022.11.018

Keywords

Photocatalyst; Pattern film; Heterostructure; Z-scheme; Water splitting

Funding

  1. National Key Research and Development Program of China [2021YFA1500800]
  2. National Natural Science Foundation of China [51825204, 52072377, 52188101]
  3. Youth Innovation Promotion Association of the Chinese Academy of Sciences [2020192]
  4. International Partnership Program of the Chinese Academy of Sciences [174321KYSB20200005]
  5. Natural Science Foundation of Liaoning Province [2021 -MS -014]

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Semiconductor heterostructures mediated by electrical conductors show great potential for Z-scheme photocatalytic water splitting. The fabricated TiO2 and Cu2O film stripes on a conductive substrate exhibit efficient charge transfer processes and enable photocatalytic overall water splitting.
Semiconductor heterostructures mediated by electrical conductors are very promising for Z-scheme pho-tocatalytic water splitting. In contrast to conventional particulate heterostructures, alternate TiO2 and Cu2O film stripes patterned parallel on a fluorine-doped tin oxide (FTO) conductive substrate was fabri-cated as a model film photocatalyst to study the characteristics of the photogenerated charge transfer process. The Z-scheme transfer process with an effective transport distance of up to 5lm occurs only in regions distant from the TiO2/Cu2O strip edges through the FTO substrate from the bottom. In contrast, the transfer of charge around their contact regions follows the conventional transfer process through the TiO2/Cu2O strip interface. These results indicate that the Z-scheme transfer process occurring in such a large region dominates the charge transfer processes in the TiO2/FTO/Cu2O pattern film heterostructure. Importantly, unlike the single component film, which is inactive for photocatalytic overall water splitting, the modified TiO2/Cu2O pattern film can induce photocatalytic overall water splitting at a stoichiometric H2/O2 ratio close to 2:1. These findings have significant implications in designing efficient heterostruc-tures by employing a Z-scheme charge transfer process. (c) 2022 Science China Press. Published by Elsevier B.V. and Science China Press. All rights reserved.

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