Qingdao Energy Research Institute developed a new type of graphynyl non-metallic electrocatalyst high-efficiency application
Fuel cell is an important new energy device, and the latest development of metal-air battery is expected. However, the kinetic process of cathode oxygen reduction and cathode oxygen precipitation reactions in metal-air batteries is slow, requiring a large amount of precious metal catalysts, which greatly increases the cost of the battery and hinders the large-scale commercialization of metal-air batteries. The Carbon-based Materials and Energy Application Research Group of the Qingdao Institute of Bioenergy and Process Research, Chinese Academy of Sciences, has carried out a lot of work in the preparation of efficient and low-cost metal-air battery cathode catalysts. In the previous study, the research group has studied the effect of nitrogen doping type on the performance of electrocatalysts based on carbon materials (ACS Appl. Mater. Interfaces 2017, 9, 29744); prepared pyridine nitrogen selective doping Carbon-based catalyst (Nat. Commun. 2018, 9, 3376.); and transition metal-nitrogen co-doped catalyst (ChemSusChem 2019, 12, 173; Carbon 2019, 147, 9) The important role of pyridine nitrogen in improving the performance of carbon-based electrocatalysts was proved, and a series of low-cost, high-performance electrocatalyst materials were prepared.
Recently, based on the preliminary work, the members of the research group used the special chemical preparation method of the new carbon material graphyne to directly prepare pyridine graphyne materials containing only pyridine nitrogen without post-doping. X-ray photoelectron spectroscopy (XPS) and X-ray absorption spectroscopy (XAS) showed that the resulting catalyst contained only pyridine nitrogen. In electrochemical tests, pyridine graphene showed better oxygen reduction electrocatalytic performance than commercial carbon-supported platinum catalysts. Using it as a cathode of a zinc-air battery, its maximum power density is higher than that of a platinum-based zinc-air battery, and it has more excellent charge and discharge stability than a platinum-based battery, and has huge application potential. Density functional theory calculations show that the sp-hybridized carbon atom closest to the pyridine nitrogen is the best oxygen reduction reaction site. This work will provide new ideas for the design and synthesis of new non-metallic catalyst materials with specific reaction sites. Related work was published in the journal Applied Catalysis B: Environmental (Appl. Catal. B: Environ. 2020, 261, 118234).
The above work was supported by the National Natural Science Foundation of China, the frontier projects of the Chinese Academy of Sciences and the key deployment projects in the institute.
Figure: Synthesis method of pyridine graphyne, X-ray photoelectron spectroscopy, X-ray absorption spectrum, electrocatalytic performance and zinc-air battery performance characterization.
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