LAUSR

Abstract The oxygen reduction reaction (ORR), which progresses at the cathode during redox reactions, is essential in fuel cells and metal-air batteries, and requires effective electrocatalysts to overcome the high activation energy. Pt/C catalysts have shown the best catalytic activity because of the superior catalytic ability of Pt particles. However, it is still a challenge to develop efficient ORR catalysts containing Pt using solution processes at low temperatures. In this work, we report a new route for producing hybrids containing well-dispersed Pt nanoparticles with uniform size distribution on the surface of borane-reduced graphene oxide (BG) using a low-temperature solution process and their excellent electrocatalytic performances for ORR in basic media. The hybrids are produced by reaction between H 2 PtCl 6 ·6H 2 O and BG using a solution process. The Pt particles have uniform size-distribution with lateral dimensions of 10–15 nm and are well-dispersed on the surface of BG without agglomeration. The hybrids show excellent electrocatalytic activity, with onset and half-wave potentials of 0.99 and 0.84 V, respectively, which are comparable to those of Pt/C and previously reported Pt-based catalysts. The hybrids also exhibit excellent four-electron selectivity and superior kinetics.