4.8 Article

Molecular Degradation of Iron Phthalocyanine during the Oxygen Reduction Reaction in Acidic Media

期刊

ACS CATALYSIS
卷 -, 期 -, 页码 11097-11107

出版社

AMER CHEMICAL SOC
DOI: 10.1021/acscatal.2c03216

关键词

proton-exchange membrane fuel cells; oxygen reduction reaction; iron phthalocyanine; degradation mechanism; radical addition reaction

资金

  1. National Key Research and Development Program of China [2021YFA1501504]
  2. Natural Science Foundation of China [22179116, 22021001]
  3. Fundamental Research Funds for the Central Universities [20720220017]
  4. China Postdoctoral Science Foundation [2021M691876]
  5. Knut and Alice Wallenberg Foundation [WAF2017.0166]

向作者/读者索取更多资源

This study investigates the degradation mechanism of molecular iron phthalocyanine (FePc) during the acidic oxygen reduction reaction (ORR) and provides important insights for understanding the performance degradation of practical Fe/N/C catalysts.
Molecular iron phthalocyanine (FePc) possesses an FeN4 active site structure similar to practical pyrolyzed Fe/N/C catalysts for the acidic oxygen reduction reaction (ORR), making it an ideal model system to derive the degradation mechanism of such catalysts. However, the degradation mechanism of FePc during the acidic ORR has been largely unclear to date. Herein, five most likely degradation factors affecting FePc-based ORR activity are individually investigated and compared. The attack by free radicals is found to be the main reason for the instability of FePc. Assisted by the combination of several spectroscopic methods, we successfully identify the degradation products and then propose a full structural evolution of molecular FePc degradation. Finally, high similarity in the decay mechanism between molecular FePc and practical Fe/N/C catalysts was present. This study provides a clear picture of the currently missing degradation mechanism of molecular FePc during acidic ORR, which will assist future investigations on the performance degradation of practical Fe/N/C catalysts.

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