4.7 Review

A review of metal oxide-based Z-scheme heterojunction photocatalysts: actualities and developments

Journal

MATERIALS TODAY ENERGY
Volume 21, Issue -, Pages -

Publisher

ELSEVIER SCI LTD
DOI: 10.1016/j.mtener.2021.100829

Keywords

Metallic oxide; Z-scheme heteroarchitecture; Electron mediators; Photocatalytic application; Preparation

Funding

  1. National Key R&D Program of China [2018YFB0605002]
  2. National Natural Science Foundation of China [21546014, 50616114]

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This article introduced the mechanism and types of metal oxide-based Z-scheme heterojunction photocatalysts, discussed the trend of Z-scheme photocatalytic mechanism being gradually replaced by S-scheme heterojunction mechanism, and summarized the applications of different types of heterojunctions in the field of photocatalysis.
Metal oxide-based Z-scheme heterojunction photocatalyst can effectually separate electrons and holes and simultaneously ensure that photocatalysts can maintain appropriate conduction band (CB) and valence band (VB) positions, thus maintaining a strong redox capacity. This article introduced the mechanism and types of Z-scheme heterojunction photocatalysts. Nevertheless, direct Z-scheme photocatalytic mechanism was gradually replaced by new S-scheme heterojunction mechanism. Thus, this review also briefly discussed the improved Z-scheme mechanism, that is, S-scheme heterojunction, so that the mechanism of the charge transfer process could be understood more intuitively and clearly. Then we emphatically summarized the applications of different types of heterojunctions in the field of photocatalysis, ranging from environmental remediation to energy conversion. In addition, several typical traditional methods and new strategies for preparing Z-scheme heterojunctions were summed up. Finally, the breakthrough and development prospect of Z-scheme heterojunction were discussed. (C) 2021 Elsevier Ltd. All rights reserved.

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