▎ 摘　　要

Dense CuOx-CoOy nano-heterostructures were uniformly assembled on the surface of graphene via surfactant induced assembly and hydrolysis with the presence of PVP and NaBH4. As-prepared CuOx-CoOy- PVP/G composite exhibited excellent performance for selective oxidation of 5-HMF to FDCA in aqueous solution with NaClO as oxidant at 30 ?, which is comparable to noble metal catalysts. The outstanding performance can be attributed to fascinating synergetic contributions from the CuOx-CoOy heterostructure on graphene substrate, giving improved interfacial contact, increased active sites and accelerated electron transfer process to promote the catalytic reaction. This work provides a high-performing catalyst for oxidation of 5-HMF to FDCA, as well as an ideal design of metal-oxide heterostructures/graphene composite catalysts for more broad applications. (C) 2022 Elsevier Ltd. All rights reserved.