Interconnected Hierarchically Porous Fe, N-Codoped Carbon Nanofibers as Efficient Oxygen Reduction Catalysts for Zn-Air Batteries
发表时间:2020-11-30 点击次数:
所属单位:材料科学与技术学院
发表刊物:ACS APPLIED MATERIALS & INTERFACES
关键字:electrospinning Fe N-codoped carbon nanofiber hierarchical structures oxygen reduction reaction Zn-air batteries
摘要:Developing porous carbon-based non-precious-metal catalysts for an oxygen reduction reaction (ORR) is a suitable approach to significantly reduce the costs of fuel cells or metal-air batteries. Herein, interconnected hierarchically porous carbon nanofibers simultaneously doped with nitrogen and iron (HP-Fe-N/CNFs) were fabricated by facile pyrolysis of polypyrrole-coated electrospun polystyrene/FeCI3 fibers. The obtained carbon nanofibers have a high specific surface area (569.6 m(2)/g) and large pore volume (1.00 cm(3)/g) as well as effective doping of N and Fe. Benefiting from the improved mass transfer and utilization of active sites attributed to interconnected hierarchical porous structures, HP-Fe-N/CNFs display excellent ORR catalytic activity in alkaline media, with a comparable onset potential and half-wave potential but superior selectivity, stability, and tolerance against methanol to commercial 30 wt % Pt/C. Particularly, when applied in an assembled Zn-air battery, HP-Fe-N/CNFs outperform 30 wt % Pt/C in power density and long-term stability, explicitly showing their promising practical application.
ISSN号:1944-8244
是否译文:否
发表时间:2017-05-17
合写作者:Zhao, Yingxuan,王岩,Zhu, Junjie,梁彦瑜
通讯作者:来庆学
发表时间:2017-05-17