▎ 摘　　要

Porous reduced graphene oxide hydrogels (RGOH), especially as supports for immobilizing metallic nanocrystals have attracted great attention in advanced nanomaterials, which have broad applications in catalysis, sensing and electric/optical devices. Herein, uniform core-shell AuPd@Pd nanocrystals supported on three-dimensional (3D) porous N-doped RGOH (AuPd@Pd NCs/N-RGOH) are facilely prepared by combining hydrothermal treatment with wet-chemical co-reduction. Ethylenediamine (EDA) is used as the nitrogen source and assembly agent for N-RGOH under hydrothermal conditions, and also as the structure-director for AuPd@Pd NCs during the wet-chemical co-reduction process. The nanocomposites display enhanced catalytic activity and stability for methanol oxidation reaction (MOR) in comparison with Pd NPs/N-RGOH and commercial Pd-C catalysts, owing to the unique structure and abundant nitrogen of N-RGOH, along with the synergistic effects between N-RGOH and AuPd@Pd NCs. (C) 2016 Elsevier Ltd. All rights reserved.