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    Home > Research group of Zhang Haimin, Institute of solid state, Chinese Academy of Sciences has made progress in the application of nitrogen doped porous carbon derived from biomass to electrocatalytic nitrogen fixation

    Research group of Zhang Haimin, Institute of solid state, Chinese Academy of Sciences has made progress in the application of nitrogen doped porous carbon derived from biomass to electrocatalytic nitrogen fixation

    • Last Update: 2019-02-19
    • Source: Internet
    • Author: User
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    Recently, the research group of Zhang Haimin, Institute of solid physics, Chinese Academy of Sciences, has made new progress in the research of nitrogen fixation by porous carbon electrocatalysis with nitrogen doping derived from biomass This work shows that pyridine nitrogen plays an important role in electrocatalytic nitrogen fixation of nitrogen doped porous carbon derived from biomass and explores its nitrogen fixation mechanism The study was published in ACS energy letters (acsenergy letters 2019, 4, 377-383) Ammonia (NH 3) is the nitrogen source of artificial fertilizer and one of the most basic synthetic chemicals to maintain human life, which is closely related to the development of human and society As we all know, N2 in the atmosphere is inexhaustible and inexhaustible, but the chemical inertia of n ≡ n bond makes it difficult to convert N2 into NH3 In industry, NH3 is usually synthesized by iron-based catalysts under high temperature and pressure, which accounts for about 1.4% of the total energy consumption of human beings every year, and produces a large number of CO2 greenhouse gases Therefore, in order to find a new technology of synthesizing NH3 under mild conditions, researchers have done a lot of research However, the conversion of N2 to NH3 is still a difficult scientific and technological problem Up to now, precious metal, non precious metal and non-metallic carbon based materials have been widely developed and studied As an electrocatalyst, they show a great potential of electrocatalytic nitrogen fixation In comparison, the preparation process of metal free carbon based nitrogen fixing electrocatalyst is simple and low cost, which can be obtained from abundant biomass resources, and has become an ideal high-efficiency nitrogen fixing electrocatalyst material However, the electrocatalyst materials for biomass conversion usually contain natural doped nitrogen elements The influence of the content and type of these doped nitrogen elements in the process of electrocatalytic nitrogen fixation (NRR) and its nitrogen fixation mechanism need to be clarified and solved Therefore, the research group selected alfalfa as raw material, which is rich, cheap, renewable and contains natural nitrogen elements, and prepared nitrogen doped carbon materials with multi-stage pore structure by the method of activated pyrolysis assisted by calcium carbonate and potassium acetate (the main doping form of nitrogen is pyridine nitrogen), and carbon materials with different pyridine nitrogen content were obtained by adjusting the pyrolysis temperature The results show that pyridine nitrogen not only plays an important role in the reduction of N 2 to NH 3, but also contributes to the formation of part of NH 3 That is to say, the doped pyridine nitrogen forms NH 3 molecules through hydrogenation, and generates n vacancy on graphite carbon, and then adsorbs and activates n 2 molecules In this study, the above conclusions are further revealed and proved by theoretical calculation, synchrotron radiation and isotope labeling experiments The results show that the best electrocatalytic nitrogen fixation performance is obtained when the pyrolysis temperature is 500 ℃ At the same time, the prepared nitrogen doped carbon materials also have excellent performance of Orr and oer The output voltage of the metal zinc air battery constructed by the materials as cathode catalyst is about 1.35 v based on this, the metal zinc air battery and the nitrogen fixing system are integrated organically, and the high-efficiency nitrogen fixing application is realized by using the zinc air battery power supply (as shown in the figure below) This research work provides an important theoretical and experimental basis for the practical application of nitrogen fixation technology in the field of energy Figure: (A-D) nitrogen doped carbon material from alfalfa pyrolysis and its electron microscopic characterization and composition analysis; (E) electrocatalytic NH3 production performance and Faraday efficiency; (f) voltage time curve of zinc air battery constructed with nitrogen doped carbon material as cathode catalyst (source: ACS energy letters) this work was supported by NSFC, the 100 person program of Chinese Academy of Sciences and the international cooperation project of innovation research team of Chinese Academy of Sciences.
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