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The reporter learned from an interview with the China University of Science and Technology on the 10th that the research team of Prof. Wu Changzheng of the school cooperated with Professor Zhang Qun’s research group to develop a new water-soluble simple small molecule cocatalyst that enables the photocatalytic hydrogen production performance to be 32 times that of widely used. Precious metal promoters provide new ways. Research results were published online in Nature Newsletter.
The efficient conversion of low-density solar energy into storable chemical energy is an important way to develop renewable energy. However, how to maximize the efficiency of light energy utilization has become a difficult problem for scientists. Precious metals are widely considered to be highly effective cocatalysts for improving the efficiency of photon energy utilization. However, precious metals, as solid catalysts, often have limited contact area. At the same time, the high cost has greatly limited the large-scale application.
In response to these challenges, Professor Wu Changzheng's research group broke through the traditional view that high-efficiency co-catalysts are mostly concentrated on the limitations of solid precious metals. For the first time, the discovery of water-soluble small molecules trifluoroacetic acid is a new class of highly efficient molecular cocatalysts. The study found that through the reversible redox reaction of simple cocatalyst molecules, photogenerated charges can be successfully transferred, which provides a new idea for the efficient use of photon energy. They added trifluoroacetic acid to a two-dimensional nanomaterial solution containing potassium citrate with a high surface area advantage, and used a cocatalyst to facilitate rapid redox reactions between molecules to accelerate the rapid transfer of charge from two-dimensional materials to improve photon utilization efficiency. Increase the photocatalytic hydrogen production performance by 32 times.
Professor Zhang Qun's research team used ultra-fast kinetics analysis to show that after the addition of trifluoroacetic acid, the lifetime of photogenerated electrons in the potassium niobate nanosheets was increased by nearly 3 times, indicating that the high-efficient charge transfer induced by the small molecule cocatalyst is the photocatalytic performance of the system. Significantly increased important reasons.
Wu Changzheng said that the proposal of the small-molecule cocatalyst strategy is expected to get rid of the traditional noble metal cocatalyst system and provide a new way for designing a cheap and efficient photocatalytic system. (Yang Baoguo Wu Lan)
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