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

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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.

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Acknowledgements

The work was supported by the Thirteenth National Key Point Research and Invention Program (No. 2016YFB0101302).

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Authors and Affiliations

  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

    Yanyan Gao, Ming Hou, Manman Qi, Liang He, Haiping Chen, Wenzhe Luo & Zhigang Shao

  2. University of Chinese Academy of Sciences, Beijing, 100049, China

    Yanyan Gao, Manman Qi, Liang He, Haiping Chen & Wenzhe Luo

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  1. Yanyan Gao
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  2. Ming Hou
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Correspondence to Ming Hou or Zhigang Shao.

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Gao, Y., Hou, M., Qi, M. et al. New insight into effect of potential on degradation of Fe-N-C catalyst for ORR. Front. Energy 15, 421–430 (2021). https://doi.org/10.1007/s11708-021-0727-2

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