Typical strategies to facilitate charge transfer for enhanced oxygen evolution reaction: Case studies on hematite

赤铁矿 分解水 析氧 氧化物 光电阴极 光催化 材料科学 纳米技术 氧化还原 化学工程 化学 无机化学 催化作用 电化学 电极 物理化学 物理 冶金 电子 工程类 量子力学 生物化学
作者
Aizhen Liao,Huichao He,Yong Zhou,Zhigang Zou
出处
期刊:Journal of Semiconductors [IOP Publishing]
卷期号:41 (9): 091709-091709 被引量:14
标识
DOI:10.1088/1674-4926/41/9/091709
摘要

Abstract Hydrogen can be sustainably produced through photoelectrochemical (PEC) water splitting. The process of PEC water splitting is composed of two vital half-reactions: water oxidation to O 2 on photoanode, and proton reduction to H 2 on photocathode. Both in thermodynamics and kinetics, the oxidation of water on photoanode is much more challenging, because the formation of O 2 involves the four-holes reaction process that is more difficult than the two-protons reduction. Accordingly, the oxidation of water into O 2 is the rate-determining reaction for PEC water splitting, which is closely affected by the light harvesting, charge separation and transfer, as well as surface activity of photoanode. In principle, water oxidation is initiated by the photo-excited charge of photoanode. In this review, we took hematite photoanode as a typical example to illustrate the progress in modifying the charge separation and migration property of metal-oxide photoanodes for water oxidation. The typical strategies adopted to facilitate the charge transfer and separation of hematite photoanode were specifically summarized. In addition, the views designing and developing hematite photoanode with high-performance for water oxidation were presented. This review provides comprehensive information about the state-of-the-art progress of hematite-based photoanodes and forecast the developing directions of photoanode materials for solar water splitting.

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