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    Home > JACS: Professor Li Yafei and collaborators of Nanjing Normal University have made important progress in the field of photocatalysis

    JACS: Professor Li Yafei and collaborators of Nanjing Normal University have made important progress in the field of photocatalysis

    • Last Update: 2018-09-14
    • Source: Internet
    • Author: User
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    Recently, Professor Li Yafei and his collaborators from the school of chemistry and materials science of Nanjing Normal University have made important progress in the design of novel two-dimensional photocatalyst The relevant research results are published in j.am under the title of "pdseo 3 monolayer: a promising organic 2D photocatalyst for direct overall water splitting without using chemical agents and cocatalysts" On chem SOC (DOI: 10.1021/jacs.8b07855) Hydrogen (H2) produced by the decomposition of water by solar energy can effectively solve the problems of energy shortage and environmental pollution, so it has been regarded as the Holy Grail in chemical research There are many problems in the traditional photocatalysts, such as the complex of photocarriers and the lack of active sites Because of its unique geometry and electronic properties, two-dimensional materials are considered to be an ideal choice for the construction of high efficiency photocatalysts However, the oxygen evolution half reaction in the process of photodegradation of water is a complex process involving 4-electron transfer, which often has a high overpotential Most of the two-dimensional photodegradation catalysts (such as C3N4) studied at present can only drive the hydrogen evolution half reaction when sacrificial agent is added, or can realize the simultaneous decomposition of water into H2 and O2 with the help of cocatalyst Therefore, it is of great scientific significance to explore a new type of two-dimensional photocatalyst which can completely dissolve water without adding sacrificial agent and cocatalyst and has high efficiency of visible light absorption In cooperation with Professor Chen Zhongfang of the University of Puerto Rico, Professor Li Yafei's research group found that a kind of layered material pdseo3 synthesized in the experiment has very small peeling energy through density functional theory calculation, so it is easy to get pdseo3 single-layer material through mechanical or liquid-phase peeling The results show that the pdseo 3 monolayer has a band gap of 2.84 EV, and has a strong absorption capacity for visible and ultraviolet light In particular, the valence band and the conduction band of pdseo 3 monolayer materials contain the redox potential of water, and the photogenerated electrons and holes can provide enough driving force to make the two semi reactions of hydrogen evolution and oxygen evolution spontaneous at different active sites Therefore, pdseo 3 monolayer material can realize the total photocatalytic water removal without adding sacrificial agent and cocatalyst This work is expected to bring new ideas to the research field of two-dimensional photocatalyst This research work has been supported by the Excellent Youth Science Foundation of NSFC, Jiangsu outstanding youth fund and Jiangsu superior discipline The first author of this paper is Joman, a 2016 level doctoral student of the Chinese Academy of chemical sciences In 2014, Qiao man was admitted to the school of chemical science of Nanjing Normal University to pursue his master's degree, and in 2016, he became a doctor and continued to engage in theoretical research of low dimensional materials So far, 7 academic papers have been published in J am Chem SOC., angel Chem Int ed., small and other magazines as the first (including co first) author.
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