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    Home > Research team of Professor Shao Mingfei and Wei Min of Beijing University of Chemical Technology: two dimensional carbon nano array loading co single atom to achieve high active site utilization

    Research team of Professor Shao Mingfei and Wei Min of Beijing University of Chemical Technology: two dimensional carbon nano array loading co single atom to achieve high active site utilization

    • Last Update: 2019-11-12
    • Source: Internet
    • Author: User
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    The design of efficient catalyst is one of the effective ways to promote the development of clean energy conversion technology Monoatomic catalysts have attracted a lot of attention because of their advantages of 100% theoretical atom utilization, coordination unsaturation and uniform catalytic sites However, the electrode reaction takes place at the three-phase interface between catalyst and electrolyte, and only the exposed active sites can participate in the catalytic reaction However, in the process of traditional catalytic electrode assembly, the use of binder will lead to the stacking or agglomeration of catalyst materials, which will make the active sites of catalyst buried, and seriously reduce the utilization of active sites and catalytic activity At present, the utilization ratio of active sites of monoatomic catalysts is generally below 15% (the loading amount is ~ 2wt%), which is far lower than the theoretical value, which is contrary to the original intention of the design It can overcome the problems of traditional electrode assembly to construct self-supporting electrode materials directly on the collector fluid For the self-supporting electrode, the ordered nano array unit can improve the electrochemical specific surface area of the material, facilitate the diffusion and transmission of the electrolyte and the effective contact with the active site However, how to realize the "self-supporting" design of monoatomic catalysts is still a huge challenge Based on this, the research team of Professor Shao Mingfei and Professor Wei Min from Beijing University of Chemical Technology reported a self-supporting two-dimensional carbon nano chip array supported co single atom catalyst (SS co SAC), which achieved the utilization rate of ultra-high active sites Due to the unique nano array structure and high active site utilization, SS co sac has excellent oxygen catalytic performance and zinc air battery performance Furthermore, the active sites of the catalysts were quantitatively studied by in situ electrochemistry The results show that compared with the traditional powder material (~ 15.48% @ 2.3wt%), the array structure greatly promotes the contact between the electrolyte and the active site, thus improving the utilization ratio of the active site and the catalytic performance (~ 22.3% @ 2.3wt%) In this work, the single atom catalyst was "arrayed" to achieve ultra-high active site utilization and excellent electrochemical performance, providing a reference for the design and application of single atom catalyst with high active site utilization The results were published in adv funct Mater (adv funct Mater 2019, 1906477) Figure 1 "Array" single atom catalyst achieves ultra-high active site utilization rate (source: adv funct Mater.) the research results are supported by National Natural Science Foundation, Beijing Natural Science Foundation, national key R & D plan and basic research funds of Central University The first author of this paper is Xie Wenfu, a doctoral student in Beijing University of chemical technology, and the corresponding authors are professor Shao Mingfei and Professor Wei Min of Beijing University of chemical technology.
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