Wednesday, 4 October 2017: 09:20
National Harbor 2 (Gaylord National Resort and Convention Center)
The CoSe2 nanoparticles were first prepared through microwave synthesis, and followed by chemical reduction of Ru on the CoSe2 surface. The transformation of orthorhombic to cubic CoSe2 phase took place upon the subsequent heat treatment at 400 ℃, which led to the formation of (RuxCoy)Se2/C nanoparticles. A small amount of Ru introduced into the CoSe2 significantly enhanced the activity of (RuxCoy)Se2/C toward oxygen reduction reaction, and high Ru utilization was achieved. The half-wave and open-circuit potentials were 0.68 V and 0.88V (vs. RHE), respectively, with the electron transfer number of 4.0 in 0.1 mol/L HClO4. The mass activity of the (RuxCoy)Se2/C catalyst reached 0.09 mA/mg Ru at 0.75 V, which is comparable to that of the commercial Pt/C catalyst (0.10 mA/mg Pt). Only 15 mV decrease in half-wave potential was observed after 1000 cycles in 0.1 mol/L HClO4, showing good stability.