Electrochemical oxygen reduction plays a key role in the fields of fuel cells, metal-air batteries, etc. The search for highly active, cost-effective, high-utilization and long-life non-precious metal ORR catalysts to replace precious metal Pt catalysts is a hot topic in this field. Research direction. Although non-noble metal monoatomic catalysts have high atomic utilization, high activity and selectivity, they tend to agglomerate and lose their activity during synthesis or catalysis. It is an urgent problem to overcome the difficulty of obtaining stable monodispersed catalysts by simple methods. .
Recently, the State Key Laboratory of Structural Chemistry at the Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences Cao Rong and Huang Yuanbiao's team used iron oxazine porphyrins as monomers, successfully passed ionothermal method, and obtained one-step synthesis of porous porphyrins covalently bonded to three Monoatomic Fe-N4 catalysts on oxazine framework materials. Under spheric microscopes, iron nanoparticles were not observed in the monoatomic catalyst, and the Fe atoms exhibited an atomic-level distribution; the extended X-ray absorption fine structure (EXAFS) showed that Four iron atoms are coordinated with four nitrogen atoms to form a stable Fe-N4 structure. Therefore, the ORR activity of this monoatomic catalyst is better than that of commercial platinum carbon catalyst (20% Pt/C) under acidic and basic conditions. Higher stability and better resistance to methanol poisoning. This study provides a new idea for the design and synthesis of highly efficient monoatomic non-precious metal catalysts, providing an important reference for the development of new high-efficiency electrocatalysts.
The relevant research results were published on the ACS Energy Letters. This research was supported by the national key R&D program, the National Natural Science Foundation of China, the Chinese Academy of Sciences' strategic pilot technology project, and the Chinese Academy of Sciences frontier scientific key research project.
