Catalysis

Kinetic Effects of Temperature on Fe-N-C Catalysts for 2e- and 4e-Oxygen Reduction Reactions

Authors

  • Jie Yang Institute of Coal Chemistry, Chinese Academy of Sciences ,
  • Junfen Li Institute of Coal Chemistry, Chinese Academy of Sciences ,
  • Ruimin Ding Institute of Coal Chemistry, Chinese Academy of Sicences ,
  • Chang Liu Institute of Coal Chemistry, Chinese Academy of Sciences ,
  • Xi Yin Institute of Coal Chemistry, Chinese Academy of Sciences

Abstract

Hydrogen peroxide (H2O2) formed via the two-electron oxygen reduction reaction (2e-ORR) on Fe-N-C catalysts at elevated temperatures can cause catalyst degradation in fuel cells. In this work, we studied the effects of temperature on the selectivity of Fe-N-C catalysts for the 2e- and 4e-ORRs in acidic electrolytes. The results showed that the H2O2 yield increased with increasing temperature, and prolonged high-temperature exposure under ORR polarization conditions led to catalyst degradation and higher H2O2 yield. These effects were further explained by means of a kinetic model describing the competitive reactions and the thermodynamics of the system.

Content

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Supplementary material

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Supporting Information
Supporting Information for manuscript entitled "Kinetic Effects of Temperature on Fe-N-C Catalysts for 2e- and 4e-Oxygen Reduction Reactions"