[ Instrument network instrument R & D ] Because of nearly 100% metal atom utilization and outstanding advantages such as high activity and high selectivity, monoatomic catalysts have shown important research value and broad potential in the fields of homogeneous catalysis and heterogeneous catalysis. Application prospects. Among them, the Fe-NC catalyst material dispersed in the atomic state is a kind of non-precious metal catalyst with potential to replace platinum / carbon (Pt / C) due to its excellent catalytic performance of Oxygen Reduction Reaction (ORR). However, the methods reported at this stage for the preparation of Fe monoatomic catalysts are mainly: the use of macromolecules or compounds rich in nitrogen and complexing organic functional groups of iron salts to complex high-purity iron salts, followed by pyrolysis and acid washing to obtain different loadings , Fe monoatomic catalysts with different properties. However, the macromolecules or compounds that can be used today often have complex preparation processes, high costs, and many have certain toxicity, which severely limits the development of Fe monoatomic catalysts and further practical production applications.
In response to the above-mentioned scientific problems, recently, the Energy Materials and Nanocatalysis Research Group led by Liang Hanyu, a researcher at the Qingdao Institute of Bioenergy and Process Research, Chinese Academy of Sciences, has developed a low-cost, simple and environmentally friendly Fe single-atom catalyst preparation strategy suitable for scale-up production. This strategy uses renewable biomass fungus with iron-rich and super-absorbent properties as carbon, nitrogen, and iron sources, without the need for any additional artificial addition of Fe salts, and only uses its own capillary adsorption to adsorb nitrogen-containing solutions for effective nitrogen content enhancement , You can get a high-efficiency Fe monoatomic catalyst (Fe-ISA / NC) with Fe-N4 as the active center.
The catalyst carbon matrix obtained in the study is rich in micro and mesopores, and has a specific surface area of ​​more than 1100 m2 g-1, more than many artificially synthesized porous carbon matrices. Among them, the nitrogen content exceeds 3 at.% And is mainly pyrrole nitrogen, which forms a rich Fe-N4 active center and exhibits excellent ORR catalytic performance. The ORR half-wave potential in the 0.1 M KOH electrolyte reached 0.89 V (vs. RHE vs. reversible hydrogen electrode), which was significantly better than the commercial precious metal Pt / C catalyst. At the same time, the ORR half-wave potential of the catalyst in 0.1 M HClO4 electrolyte also reached 0.78 V vs. RHE, showing better catalytic performance than most transition metal catalysts. Related research results have been published in the international journal Carbon (2020, 157, 614-621. DOI: 10.1016 / j.carbon.2019.10.054).
The research results have played an important role in improving the catalytic performance of Fe monoatomic catalyst materials, reducing the cost of preparation, and promoting the practical application. At the same time, the use of renewable biomass as a raw material has been demonstrated without any metal addition. Feasibility of derivatization to prepare highly efficient non-noble metal monoatomic catalysts.
The above research was supported by the Qingdao Energy Institute's Research and Innovation Fund and the two fusion funds.
Related publications and patent links:
1. Xilong Wang, Jian Du, Qinghua Zhang, Lin Gu, Lijuan Cao, Han-PuLiang, * In situ synthesis of sustainable highly efficient single iron atoms anchored on nitrogen doped carbon derived from renewable biomass, Carbon, 2020, 157, 614- 621.
2. An efficient electrochemical reduction catalyst for biomass carbon and its preparation method and application, China, invention patent, authorized patent number 8.
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