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Recently, Li Can, Academician of the Chinese Academy of Sciences, Chinese State Key Laboratory of Catalysis and the National Laboratory of Clean Energy of the Chinese Academy of Sciences and National Laboratory of Clean Energy, and Associate Researcher Shi Jingying cooperated with Chen Jian, a researcher of the fuel cell research department, in solar energy-chemical conversion and Progress has been made in the cross-domain of electrochemical energy storage. A photoelectrochemical (PEC) system based on dual silicon photoelectrodes has been designed and constructed for the efficient catalytic conversion of redox couple species, and the use of a solar light self-driven aqueous solution battery charging system has been successfully achieved. The Solar Rechargeable Flow Cell (SRFC), an integrated solar energy in-situ chemical conversion-storage-powered concept device, has been constructed and published in the recent Nature and Communications Journal (Nature Communications, 2016). 7:11474, doi:10.1038/ncomms11474, Shichao Liao, Jingying Shi, Jian Chen and Can Li, et al.).
In this work, a wide-spectrum absorption silicon-based photoanode and a silicon-based photocathode are prepared, and a photoelectrolytic cell is constructed to drive the non-spontaneous oxidation and reduction of species to kinetic and rapid redox reactions in a flow cell under irradiation with sunlight. In other words, during the charging process, after the end of charging, the carbon paper electrode can be used to provide external spontaneous power supply in-situ, thereby constructing an in-situ integration system for conversion of solar energy→chemical energy→electrical energy. Through this system, intermittent and energy density can be achieved. The low solar energy is converted into continuous electric energy that can be used directly (as shown in the diagram). Taking the AQDS/Br2 flow battery as an example, the constructed SRFC device can perform its own charging process under the irradiation of sunlight, its photo-chemical conversion energy utilization efficiency is as high as 5.9%, and the initial discharge voltage of the battery after charging is as high as 0.8V. The above; the entire light charge-discharge process light energy conversion rate above 3.0%, is the highest reported value of the same type of device literature; and the device shows good stability of charge and discharge cycles. The research results open up new ideas for the in-situ conversion, storage and utilization of solar energy, and show potential application prospects.
The research was funded by the “973†project of the Ministry of Science and Technology, the National Natural Science Foundation of China, and the Collaborative Innovation Center for Energy Materials Chemistry (2011•iChEM) of the Ministry of Education.
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