Review
Version 1
Preserved in Portico This version is not peer-reviewed
A Review on Oxygen-deficient Titanium Oxide for Photocatalytic Hydrogen Production
Version 1
: Received: 19 May 2023 / Approved: 19 May 2023 / Online: 19 May 2023 (07:14:32 CEST)
A peer-reviewed article of this Preprint also exists.
Chen, Y.; Fu, X.; Peng, Z. A Review on Oxygen-Deficient Titanium Oxide for Photocatalytic Hydrogen Production. Metals 2023, 13, 1163. Chen, Y.; Fu, X.; Peng, Z. A Review on Oxygen-Deficient Titanium Oxide for Photocatalytic Hydrogen Production. Metals 2023, 13, 1163.
Abstract
Photocatalytic technology based on specific band structure of semiconductors offers a promising way to solve the urgent energy and environmental issues in modern society. In particular, hydrogen production from water splitting over semiconductor photocatalysts attracts great attention owing to the clean source and application of energy, which highly depends on the performance of photocatalysts. Among the various photocatalysts, TiO2 has been intensively investigated and used extensively due to its outstanding photocatalytic activity, high chemical stability, non-toxicity and low cost. However, pure TiO2 has a wide band gap of approximately 3.2 eV, which limits its photocatalytic activity for water splitting to generate hydrogen only under ultraviolet light, excluding most of the inexhaustible sunlight for human beings. Fortunately, the band gap of semiconductors can be manipulated, in which introducing oxygen defects is one of the most effective measures to narrow the band gap of titanium oxides. This review starts out by the fundamentals of photocatalytic water splitting for hydrogen production over TiO2, discusses the latest progress in this field, and summarizes the various methods and strategies to induce oxygen defects in TiO2 crystals. Then, the next section outlines the modification approaches of oxygen-deficient titanium oxide (TiO2-δ) to further improve its photocatalytic performance. Finally, a brief summary and outlook of the researches on TiO2-δ photocatalysts for water splitting to produce hydrogen were presented.
Keywords
TiO2 crystals; Oxygen defects; Photocatalysis; Water splitting; Hydrogen production
Subject
Chemistry and Materials Science, Materials Science and Technology
Copyright: This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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