Research progress on solar photoelectrocatalytic water splitting hydrogen production of Dalian Institute of Chemical Physics, Chinese Academy of Sciences
Recently, the solar energy research team led by Academician Li Can of the State Key Laboratory of Catalysis and the National Laboratory of Clean Energy of the Dalian Institute of Chemical Physics of the Chinese Academy of Sciences has made new progress in the research of solar photoelectrocatalysis for the production of hydrogen from water.
In the study of semiconductor photoanodes based on Ta3N5, the "cavity storage layer" capacitance effect was discovered, and a highly efficient and stable solar photoelectrochemical decomposition water system was designed and obtained. The relevant research results were published in the form of communication online in the near future. German Journal of Applied Chemistry (Guiji Liu, Jingying Shi, Can Li, et al., Angew. Chem. Int. Ed., DOI: 10.1002/anie.201404697).
Photoelectrocatalytic decomposition of water to produce hydrogen is one of the ideal ways to use solar energy to prepare fuel. In the past half century, scientists from all over the world have made unremitting efforts to develop efficient and stable solar photoelectrocatalytic water decomposition systems.
Li Can's research team has initiated the research on photocatalytic water splitting of solar energy, and initiated research on photoelectrocatalytic water splitting by solar energy. In recent years, continuous progress has been made in the design and preparation of photoanode systems for key parts of photoelectrocatalysis: BiVO4 modified with cocatalysts. As a photoanode, a visible light-driven full decomposition water reaction was realized under the minimum bias (Phys. Chem. Chem. Phys., 2013, 15, 4589-4595). Recently, a BiVO4 photoanode was coupled with a silicon stack photocathode. The current hydrogen production efficiency of solar energy reaches 2.5%, which is the best result of this system.
In order to increase the efficiency of hydrogen production by solar energy, narrow-bandgap semiconductor photoanodes need to be developed for broad-spectrum light-harvesting, among which the representative narrow-bandgap semiconductor Ta3N5 material has a theoretical efficiency of over 15% for hydrogen production from solar energy, and is currently an international solar-photoelectrocatalytic system. One of the main attack systems in the hydrogen field. However, this system is susceptible to photo-corrosion, and solving its stability is a challenging subject in this field.
In this work, the ferrihydrite (Fh) layer was assembled on the surface of the photoanode, and under the premise of maintaining the high efficiency of photoelectrocatalytic water oxidation, it was found that its stability could be improved from a few minutes to several hours, even after working for more than ten hours. Recession, which is currently the highest stability of the Ta3N5 decomposition water anode system reported in the world. It has been found that Ta3N5 surface ferrihydrite (Fh) layer has the hole storage ability of the capacitor, which can quickly transfer and efficiently store the photogenerated holes formed in Ta3N5 photoexcited holes to protect the semiconductor from photo-oxidation oxidation, thereby increasing the number of photoanodes. stability. The concept of photoelectrocatalytic "hole storage layer" has been proposed internationally, which provides new ideas and strategies for further designing and constructing an efficient and stable solar energy conversion system.
The research 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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