▎ 摘　　要

How to overcome the bottleneck of Pt-based catalysts is a research focus in the field of energy conversion, and the combination of metal oxide with Pt-based catalysts is a promising strategy to avoid platinum aggregation and introduce novel photosensitivity into traditional Pt catalysts by virtue of the photosensitivity of metal oxide semiconductors. In this work, Pt-MoOx/graphene (S) (simplified as Pt-MoOx/GN (S)) was synthesized by a solid-phase reaction with Na2MoO4 as the Mo precursor, in which Na2MoO4 was partially reduced to MoO2, leading to the formation of MoOx in the composite. The integration of MoOx with Pt results in the uniform dispersion of Pt nanoparticles. Electrochemical tests reveal that the catalytic activity of Pt-MoOx/GN (S) is comparable to that of commercial 30% PtRu/C-JM toward the oxygen reduction reaction via a 4-electron transfer process. In particular, Pt-MoOx/GN (S) displays a more positive reduction potential and stronger stability, which is ascribed to the synergies between MoOx and Pt. Owing to the introduction of photo-responsive MoOx species, Pt-MoOx/GN (S) also exhibits significantly higher mass activity under simulated sunlight illumination, which is 1.62 times as much as that without illumination. The result is in favor of converting solar energy into electric energy during a traditional electrocatalytic process.