▎ 摘　　要

The oxygen reduction reaction (ORR) is one of the key fundamental reactions that occur at electrocatalytic cathode surfaces for fuel cell applications. Herein, we report the development of a series of nanocomposites of reduced graphene oxide (rGO) and PtRu nanoparticles with different atomic ratios of Pt/Ru deposited on titanium dioxide nanotubes (TiO2NTs) (termed as TiO2NT/rGO-PtRu) for the ORR. The TiO2NT/rGO-PtRu nanocomposites were prepared by using a facile one-step electrochemical deposition, and characterized through field-emission scanning electron microscopy, energy dispersive X-ray spectroscopy, X-ray diffraction, and X-ray photoelectron spectroscopy. Our experimental results have shown that the synthesized TiO2NT/rGO-PtRu nanocomposite with a Pt/Ru ratio of 64:36 exhibits the highest electrocatalytic activity toward the ORR with an onset potential of 0.58V (vs. RHE) and a high stability, which is promising for environmental and green energy applications.