• 文献标题:   CoFe Nanoalloys Encapsulated in N-Doped Graphene Layers as a Pt-Free Multifunctional Robust Catalyst: Elucidating the Role of Co-Alloying and N-Doping
  • 文献类型:   Article
  • 作  者:   BARMAN BK, NANDA KK
  • 作者关键词:   nanoalloy, ndoped graphene, trifunctional robust catalyst, oxygen reduction reaction, hydrogen evolution reaction, 4np reduction
  • 出版物名称:   ACS SUSTAINABLE CHEMISTRY ENGINEERING
  • ISSN:   2168-0485
  • 通讯作者地址:   Indian Inst Sci
  • 被引频次:   8
  • DOI:   10.1021/acssuschemeng.8b01861
  • 出版年:   2018

▎ 摘  要

Pt is known to be a state-of-the-art catalyst for oxygen reduction reaction (ORR) and hydrogen evolution reaction (HER), while it can also be used for the hydrogenation of 4-nitrophenol (4-NP) to 4-aminophenol (4-AP). The quest is ongoing to find a suitable catalyst to circumvent the problems associated with the precious metal Pt. Here, we report a facile and green strategy to fabricate CoFe nanoalloys encapsulated in N-doped graphene layers (CoxFe1-x@N-G) by pyrolysis and their catalytic activity toward ORR, HER, and hydrogenation of 4-NP. Intensive studies have been carried out to elucidate the roles of alloying and N-doping. The catalytic activity is found to improve with increasing amounts of Co in the CoFe core and N-doping in the graphene layers. A similar onset potential with better current density as compared to the state-of-the-art Pt/C catalyst in alkaline medium has been achieved for CoxFe1-x@N-G toward ORR activity. These catalysts also show efficient and highly stable HER activity and are very efficient and magnetically separable in the hydrogenation of 4-NP to 4-AP. Overall, the non-precious-metal alloy nanostructures can be exploited as multifunctional catalysts in fuel cells, hydrogen storage systems, and wastewater treatment.