▎ 摘　　要

Design and synthesis of oxygen reduction reaction (ORR) catalysts with both high activity and durability is a challenging task for the novel energy systems. Here we report a very promising ORR catalyst composed of strongly coupled platinum nanotubes and nitrogen-doped graphene (Pt NTs/NG), which was synthesized by in-situ galvanic replacement reaction. The newly developed catalyst shows ultrahigh activity and durability towards ORR in acidic medium. X-ray photoelectron spectroscopy, high-resolution transmission electron microscopy together with electrochemical analyses indicated that the greatly enhanced performance is due to the strong interaction between platinum and nitrogen-doped graphene support. This hybrid catalyst system is of great potential for application in proton exchange membrane fuel cell. (C) 2015 Published by Elsevier Ltd.