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Development of anions-mixed photocatalysts with wide visible-light absorption bands for solar water splitting.

ChemSusChem 2018 September 14
The rapid fossil-fuel consumption, severe environmental concerns, and growing energy demands call for the exploitation of environmentally friendly, recyclable new energy. Fuel-producing artificial system that directly converts solar energy into fuels by mimicking natural photosynthesis, is expected to achieve this goal. Among them, the conversion of solar energy to hydrogen energy through photocatalytic water splitting process over a particulate semiconductor is one of the most promising routes due to the advantages such as simplicity, cheapness and ease for large-scale production etc. Abundant metal oxide photocatalysts have been developed in the last century, but most of which are only active under UV light irradiation. In order to harvest a much wider range of solar spectrum, the development of photocatalysts with wide spectrum utilization becomes more and more popular in this century. In this minireview, we will provide a brief overview of the materials mainly developed for promising solar water splitting with an emphasis on anions-mixed structure and wide visible-light absorption bands, before which some basic information on the principles, approaches, and research progress on photocatalytic water splitting reaction via particulate semiconductors will be shortly introduced. Meanwhile, some typical research progress on the one-step and two-step (Z-scheme) overall water splitting systems utilizing the anions-mixed photocatalysts will be highlighted together with the research strategies and modification methods.

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