▎ 摘　　要

The sheet-on-sheet reduced graphene oxide (RGO)/CuxO-CeO2 catalysts were synthesized by a facile hydrothermal procedure and systematically characterized by X-ray powder diffraction, scanning electron microscopy, transmission electron microscopy, hydrogen temperature-programmed reduction, X-ray photoelectron spectroscopy and N2 adsorption desorption techniques. It is found that there is a large amount of reduced copper species in the RGO/CuxO-CeO2 catalysts, and the addition of RGO was beneficial for the dispersion of particles and the improvement of textural properties. The spherical nanoparticles of copper species can be served as spacers to prevent the stacking of RGO. Copper and cerium species are homogenously distributed on the surface of RGO sheets. The introduction of RGO improves the formation of high Ce3+ concentration and oxygen vacancies. Therefore, the RGO/CuxO-CeO2 catalysts show higher catalytic activity than the CuO-CeO2 catalyst at low temperature (below 135 degrees C). Moreover, good resistance to H2O and CO2 of the RGO/CuxO-CeO2 may be from for the formation of hydroxyl groups by dissociative adsorption of H2O on the surface of RGO, which can improve the WGS reaction and the decomposition of carbonates. (C) 2017 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.