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Keywords:

  • Alkaline Media;
  • Cathode;
  • Direct Methanol Fuel Cell;
  • Electrocatalyst;
  • Oxygen Reduction Reaction

Abstract

Carbon-encapsulated cobalt-tungsten carbides (CoWC@C) were synthesized by reduction and carbonization method and used as the electrocatalyst for oxygen reduction reaction (ORR) in direct methanol fuel cells. The as-prepared samples were characterized by transmission electron microscope, X-ray diffraction, and X-ray photoelectron spectroscopy. The results show that CoWC@C consists of outer layer carbon and internal Co3W3C, WC, and Co. The cyclic voltammetry results show that CoWC@C has high ORR activity, long-term durability, and good methanol-tolerant performance. It is revealed that the main active phase for ORR of CoWC@C is Co3W3C, and the outer layer carbon plays the role in improving the durability of the catalyst.