期刊
JOURNAL OF MATERIALS CHEMISTRY A
卷 8, 期 12, 页码 6076-6082出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/d0ta00073f
关键词
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资金
- National Natural Science Foundation of China [21673171]
- Programme of Introducing Talents of Discipline to Universities [B17034]
- National Natural Science Fund for Distinguished Young Scholars [51425204]
The exploration of efficient, stable, and inexpensive oxygen reduction reaction (ORR) electrocatalysts to replace Pt/C in fuel cells and metal-air batteries still remains an ongoing challenge. Herein, we report an efficient ORR electrocatalyst composed of single-atom FeNx and gamma-Fe2O3 nanoparticle co-functionalized hollow graphitic carbon nanofibers (FeNx/Fe2O3-CNFs). It is found that the FeNx species serve as the active sites, while the gamma-Fe2O3 nanocrystals function as a co-catalyst to boost the ORR catalytic activity. The obtained FeNx/Fe2O3-CNFs exhibit desirable ORR electrocatalytic activity with a 4-electron transfer pathway, a half-wave potential of 0.81 V approaching that of commercial Pt/C, low hydrogen peroxide yields (<6% at 0.2-0.7 V), long-term stability (87.14% after 30 000 s), and excellent methanol tolerance. The assembled Zn-air battery based on the FeNx/Fe2O3-CNFs has an open circuit voltage of 1.51 V and superior energy density of 920 W h kg(-1). This work highlights the significant contribution of the co-catalyst in electrocatalysis.
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