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Fluorescence detection of hydroxyl radical generated from oxygen reduction on Fe/N/C catalyst

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Abstract

Pyrolyzed Fe/N/C catalyst has been considered as the most promising candidate to replace Pt for oxygen reduction reaction (ORR) in fuel cells. However, poor stability of Fe/N/C catalyst, mainly attributed to the oxidation corrosion by aggressive •OH radical, severely hampers its applications. However, the exact mechanism for generation of •OH is unclear yet. Herein, we developed a fluorescent method to effectively detect •OH generated from ORR on Fe/N/C catalyst by using coumarin as a fluorescent probe. A great difference in potential dependence between •OH and H2O2 generated from the ORR was observed, which suggests that •OH is not generated from the decomposition of H2O2 as traditional viewpoint.

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Acknowledgements

This work was supported by the National Key Research and Development Program of China (2017YFA0206500), and the National Natural Science Foundation of China (21603103, 21875194, 21902125, 91645121).

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Authors and Affiliations

  1. State Key Laboratory of Physical Chemistry of Solid Surfaces, Innovation Center of Chemistry for Energy Materials, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen, 361005, China

    Li-Na Chen, Wen-Song Yu, Tao Wang, Zhi-Xin Chen, Tan Wang, Na Tian, Zhi-You Zhou & Shi-Gang Sun

  2. College of Materials Science & Engineering, Huaqiao University, Xiamen, 361021, China

    Xiao-Dong Yang

  3. Institute of Advanced Electrochemical Energy, School of Materials Science and Engineering, Xi’an University of Technology, Xi’an, 710048, China

    Hui-Juan Yang

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  1. Li-Na Chen
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  2. Wen-Song Yu
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  3. Tao Wang
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Correspondence to Zhi-You Zhou.

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Chen, LN., Yu, WS., Wang, T. et al. Fluorescence detection of hydroxyl radical generated from oxygen reduction on Fe/N/C catalyst. Sci. China Chem. 63, 198–202 (2020). https://doi.org/10.1007/s11426-019-9635-2

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  • DOI: https://doi.org/10.1007/s11426-019-9635-2

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