Due to the worldwide energy and environmental issues, the research on the photocatalytic decomposition of water to hydrogen and reduction of carbon dioxide in recent years has attracted extensive attention in the international academic community. Photocatalytic water decomposition is considered to be the most challenging problem. Once a breakthrough is achieved, it is expected to affect the world energy landscape. The key to this reaction is the development of highly efficient photocatalysts, which in turn will create efficient photocatalytic or photoelectrocatalytic systems.
Recently, the Department of Solar Energy led by Academician Li Can of Dalian Institute of Chemical Physics, Chinese Academy of Sciences, has discovered the effect of charge separation between different crystal planes of semiconductors such as BiVO4 (Nature Commun., 4, 1432, 2013, Rengui Li, Fuxiang Zhang, Hongxian Han). And Can Li et al., the related research work has made new progress.
By using the charge separation effect between different crystal faces of the semiconductor photocatalyst, the redox dual catalysts are assembled and assembled on different exposed crystal faces of the photocatalyst, and the photocatalytic activity can be improved by more than two orders of magnitude, further confirming the photogenerated charge between the crystal planes. The separation effect and the synergistic promoting effect of the dual promoters provide a strategy for the rational design and synthesis of high-efficiency photocatalysts. The related results were recently published in Energy & Environmental Science, an energy and environmental sciences journal (Energy Environ. Sci., 2014, DOI: C3EE43304H, Rengui Li, Hongxian Han, Fuxiang Zhang, Donge Wang and Can Li).
Based on the photo-induced charge separation effect between different crystal planes of semiconductor photocatalysts discovered in the previous stage, the work has differently supported different oxidation and reduction dual promoters to the (110) and (010) of the photocatalyst BiVO4. On the crystal surface, the activity of photocatalytic oxidation of water is increased by more than two orders of magnitude. Studies have found that when only one cocatalyst is supported, the activity can be increased to a certain extent. Only when the dual co-catalyst is selectively supported on a specific crystal surface can a significant synergistic effect be exhibited and the photocatalytic oxidation can be achieved. Water reactivity has been greatly improved.
The photocatalyst prepared by this strategy was also used in the photocatalytic oxidation degradation of a variety of pollutants. It was also found that the photocatalytic reaction activity can be significantly improved, and further confirmed that the synergistic light promoted by the dual catalysts on different crystal planes. The catalytic reaction mechanism provides a new strategy for the rational design and synthesis of semiconductor-based photocatalytic systems to achieve efficient photocatalytic water splitting.
This work was funded by the National Natural Science Foundation of China and the "973" project of the Ministry of Science and Technology.
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