Dalian Chemical Institute has made progress in the research of photoelectric catalytic decomposition of water to produce hydrogen
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In the early stage, Li Can’s team built high efficiency by simulating the important functions of the key components in the natural light system II. Photoelectric catalytic water oxidation system (J. Am. Chem. Soc., 2018; Adv. Mater., 2019), found that partially oxidized graphene (pGO) can be used as a charge transport medium between the light-harvesting material and the water oxidation catalyst , Its function is similar to that of tyrosine (Tyr) in natural light system II.
In the research, based on the principle of natural photosynthesis, the team adopted a multi-media regulation strategy to achieve the high-efficiency photoelectric catalytic total water splitting process inspired by the Z mechanism of natural photosynthesis. The team assembled an efficient unbiased fully split water photoelectrochemistry by coupling an inorganic oxide-based photoanode (BiVO4) and an organic polymer-based photocathode (PBDB-T:ITIC:PC71BM) with multiple charge transport media. Pool. The study found that the discrete energy level characteristics of the organic polymer in the system make the spectral absorption of the organic photocathode and the inorganic photoanode have a good complementarity, which greatly improves the utilization rate of solar energy. In addition, the system constructs a biomimetic charge transport chain containing multiple charge transport media between the light-harvesting material and the electron acceptor/donor. Driven by the electrochemical potential gradient, photo-generated electrons are effectively transferred through these charge transport media, which increases the charge transfer rate and reduces the charge recombination rate, realizing efficient charge separation and transfer. As a result, the solar-hydrogen (STH) conversion efficiency reaches 4.3%. This research provides new ideas and effective methods for the rational design and assembly of efficient artificial photosynthetic systems by using a bionic strategy of multi-media regulation with matching energy levels.
The Li Can team of Dalian Institute of Physics and Chemicals is co-operated by natural light Inspired by the Z mechanism, a high-efficiency photoelectric catalytic full water splitting process is realized