Journal
INTERNATIONAL JOURNAL OF MINERALS METALLURGY AND MATERIALS
Volume 27, Issue 5, Pages 584-601Publisher
SPRINGER
DOI: 10.1007/s12613-020-1983-6
Keywords
photoelectrochemical water splitting; photoelectrode; metal oxide; anodization; nanostructure; structural engineering
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Funding
- National Key Research and Development Program of China [2016YFB0700300]
- National Natural Science Foundation of China [51503014, 51501008]
- Fundamental Research Funds for the Central Universities of China [230201818-002A3]
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Photoelectrochemical (PEC) water splitting offers the capability of harvesting, storing, and converting solar energy into clean and sustainable hydrogen energy. Metal oxides are appealing photoelectrode materials because of their easy manufacturing and relatively high stability. In particular, metal oxides prepared by electrochemical anodization are typical of ordered nanostructures, which are beneficial for light harvesting, charge transfer and transport, and the adsorption and desorption of reactive species due to their high specific surface area and rich channels. However, bare anodic oxides still suffer from low charge separation and sunlight absorption efficiencies. Accordingly, many strategies of modifying anodic oxides have been explored and investigated. In this review, we attempt to summarize the recent advances in the rational design and modifications of these oxides from processes before, during, and after anodization. Rational design strategies are thoroughly addressed for each part with an aim to boost overall PEC performance. The ongoing efforts and challenges for future development of practical PEC electrodes are also presented.
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