High Catalytic Activity of Ru@CoSe2/C toward Oxygen Reduction Reaction

High electrocatalytic activity toward oxygen reduction reaction (ORR) of carbon supported Ru@CoSe₂ catalysts (Ru@CoSe₂/C) were prepared through a simple and facile two-step route. The CoSe₂ nanoparticles were first obtained by microwave method, and then followed by galvanic substitution of Ru on CoSe₂. The introduction of a small amount of Ru into CoSe₂ led to a core-satellite structure in which the disordered Ru nanoparticles were adsorbed on the CoSe₂ nanocrystallites. Compared with Ru₈₅Se₁₅/C^[1] and CoSe₂/C^[2], the Ru@CoSe₂/C exhibited higher ORR activity due to the enhanced Ru utilization through the interaction between Ru and CoSe₂. Accordingly, the half-wave potential of 0.548 V and the cathodic current density of 3.37 mA cm^-2 at 0.6 V were achieved for Ru@CoSe₂/C in an acidic solution.

[1]       Q. Zheng, X. Cheng, T. C. Jao, F. B. Weng, A. Su, Y. C. Chiang. Fuel cell performances at optimized Nafion and Ru₈₅Se₁₅ loadings in cathode catalyst layer. Journal of Power Sources 201 (2012) 151-158

[2]       H. Li, D. Gao, X. Cheng. Simple microwave preparation of high activity Se-rich CoSe₂/C for oxygen reduction reaction. Electrochimica Acta 138 (2014) 232-239