期刊
APPLIED SURFACE SCIENCE
卷 639, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.apsusc.2023.158218
关键词
Fe-N-C; Multi-dimensional; Cross-linking structure; ORR; Zinc-air battery
A sol-gel approach was used to synthesize a Fe-Fe3N/3DNC composite material, which showed exceptional electrocatalytic activity in the oxygen reduction reaction (ORR) of a zinc-air battery. The surface structure optimization of the electrocatalyst was crucial for improving the battery performance.
Taking into consideration the sluggish kinetics of the oxygen reduction reaction (ORR) and the distinct three-phase environment of the electrode, it is crucial to optimize the surface structure of the electrocatalyst. This study employs a sol-gel approach to synthesize a Fe-Fe3N composite three-dimensional nitrogen-doped carbon framework (Fe-Fe3N/3DNC) and utilize it as the electrocatalyst for a zinc-air battery. The material possesses a multi-dimensional cross-linking frame structure comprised of one-dimensional and two-dimensional crosslinks, which effectively reduce the diffusion mean-free path of oxygen. Moreover, the iron-nitrogen site and nitrogen -rich carbon substrate both exhibit exceptional electrocatalytic activity for ORR. Consequently, a conventional liquid zinc-air battery utilizing this material as the air cathode catalyst exhibits a maximum power density of 242.8 mW cm-2, surpassing that of commercial Pt/C. Additionally, DFT calculations further confirm the crucial enhancing influence of Fe3N in the Fe-Fe3N/3DNC composite on ORR. This research provides valuable insights for the development of ORR electrocatalysts with outstanding efficiency.
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