RESEARCH ARTICLE

New insight into effect of potential on degradation of Fe-N-C catalyst for ORR

  • Yanyan GAO 1 ,
  • Ming HOU , 2 ,
  • Manman QI 1 ,
  • Liang HE 1 ,
  • Haiping CHEN 1 ,
  • Wenzhe LUO 1 ,
  • Zhigang SHAO , 2
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  • 1. Fuel Cell System and Engineering Laboratory, Key Laboratory of Fuel Cells & Hybrid Power Sources, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China; University of Chinese Academy of Sciences, Beijing 100049, China
  • 2. Fuel Cell System and Engineering Laboratory, Key Laboratory of Fuel Cells & Hybrid Power Sources, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China

Received date: 09 Jul 2020

Accepted date: 11 Sep 2020

Published date: 15 Jun 2021

Copyright

2021 Higher Education Press

Abstract

In recent years, Fe-N-C catalyst is particularly attractive due to its high oxygen reduction reaction (ORR) activity and low cost for proton exchange membrane fuel cells (PEMFCs). However, the durability problems still pose challenge to the application of Fe-N-C catalyst. Although considerable work has been done to investigate the degradation mechanisms of Fe-N-C catalyst, most of them are simply focused on the active-site decay, the carbon oxidation, and the demetalation problems. In fact, the 2e pathway in the ORR process of Fe-N-C catalyst would result in the formation of H2O2, which is proved to be a key degradation source. In this paper, a new insight into the effect of potential on degradation of Fe-N-C catalyst was provided by quantifying the H2O2 intermediate. In this case, stability tests were conducted by the potential-static method in O2 saturated 0.1 mol/L HClO4. During the tests, H2O2 was quantified by rotating ring disk electrode (RRDE). The results show that compared with the loading voltage of 0.4 V, 0.8 V, and 1.0 V, the catalysts being kept at 0.6 V exhibit a highest H2O2 yield. It is found that it is the combined effect of electrochemical oxidation and chemical oxidation (by aggressive radicals like H2O2/radicals) that triggered the highest H2O2 release rate, with the latter as the major cause.

Cite this article

Yanyan GAO , Ming HOU , Manman QI , Liang HE , Haiping CHEN , Wenzhe LUO , Zhigang SHAO . New insight into effect of potential on degradation of Fe-N-C catalyst for ORR[J]. Frontiers in Energy, 2021 , 15(2) : 421 -430 . DOI: 10.1007/s11708-021-0727-2

Acknowledgments

The work was supported by the Thirteenth National Key Point Research and Invention Program (No. 016YFB0101302).

Electronic Supplementary Material

ƒSupplementary material is available in the online version of this article at https://doi.org/10.1007/s11708-021-0727-2 and is accessible for authorized users.
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