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    Home > Deng Dehui research team of collaborative innovation center of energy materials chemistry successfully realizes efficient decomposition of hydrogen sulfide for hydrogen production by Electrocatalysis

    Deng Dehui research team of collaborative innovation center of energy materials chemistry successfully realizes efficient decomposition of hydrogen sulfide for hydrogen production by Electrocatalysis

    • Last Update: 2020-02-14
    • Source: Internet
    • Author: User
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    Recently, Deng Dehui research team of I Chem successfully realized the efficient decomposition of hydrogen sulfide to prepare high-purity hydrogen, which provided a new idea for eliminating hydrogen sulfide pollutants and coupling to prepare green hydrogen energy The results were published in the Journal of energy & Environmental Science (DOI: 10.1039 / c9ee03231b) under the title of "highly efficient H 2 production from H 2 s via arbust graph energy encapsulated metal catalyst" Hydrogen sulfide is a toxic gas widely existing in petrochemical industry, but it is also a potential hydrogen production raw material At present, Claus method is used to treat hydrogen sulfide in industry, but only sulfur powder is recovered, and hydrogen component is discharged in the form of water vapor, which is not effectively utilized Electrocatalytic decomposition of hydrogen sulfide is a mild and efficient method, which can produce hydrogen through cathode and sulfur by anode, and realize the separation and recovery of hydrogen and sulfur powder at the same time However, in the catalysts reported at present, precious metals are expensive, transition metals and their oxides are easily poisoned or corroded by reaction medium and lose their activity, which greatly limits the development of this technology Therefore, it is urgent to develop a low-cost, active and corrosion-resistant catalytic material for high-efficiency electrocatalytic decomposition of hydrogen sulfide to produce hydrogen Based on the concept of armor catalysis first proposed by the research team in the early stage in the world (angelw Chem Int ed 2013, 52, 371; angelw Chem Int ed 2014, 53, 7023; energy energy SCI., 2014, 7, 1919; angelw Chem Int ed 2015, 54, 2100; nature nanotech 2016, 11, 218; energy energy SCI., 2016, 9, 123; adv mater In 2017, 29, 1606967; adv mater 2019, 31, 1901996), Deng Dehui team developed a new type of armor catalyst with graphene shell encapsulated cobalt nickel nanoparticles, which showed excellent catalytic activity and stability in the electrocatalytic hydrogen sulfide system The initial potential of the optimized catalyst is 1.24 V lower than that of electrolyzed water At the same voltage, the current density of Pt-C catalyst is twice as high as that of other noble metals, metal oxides and carbon materials This high activity did not decay in the stability test of 500 hours, indicating its excellent corrosion resistance At the same time, the Faraday efficiency of hydrogen production by the cathode is as high as 98%, which realizes the efficient preparation of hydrogen Further more, the team cooperated with Guan Jing, associate professor of Qingdao University of science and technology, and found that the excellent activity of the catalyst was due to the coordinated adjustment of the electronic structure of graphene shell by the nitrogen atoms on the metal core and graphene shell, thus promoting the efficient formation of polysulfides on the graphite surface In order to verify the reliability of the catalyst, the research team applied the catalyst to the demonstration experiment of removing hydrogen sulfide impurities (including 2% H2S) in industrial synthesis gas and coupling hydrogen production During the stability test for 1200 hours, the catalyst still maintained excellent stability, further confirming the huge potential of the catalyst in the field of hydrogen production by hydrogen sulfide decomposition In addition, there are a large number of sulfur ion pollutants in the wastewater discharged from paper mills and leather factories The armor catalyst is expected to provide a reference for the electrocatalytic removal of sulfur ion pollutants in this kind of wastewater Zhang Mo, a 2016 Ph.D student from the school of chemistry and chemical engineering of Xiamen University, and Guan Jing, an associate professor of Qingdao University of science and technology are the co first authors of this paper The research work was supported by the key R & D plan of the Ministry of science and technology of China, the National Natural Science Foundation of China, the key research project of cutting-edge science of the Chinese Academy of Sciences, the cooperation fund project of the Clean Energy Innovation Research Institute of the Chinese Academy of Sciences, and the energy material chemistry collaborative innovation center of the Ministry of Education (2011 · I Chem).
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