▎ 摘　　要

Monometallic Au and Pd, and bimetallic AuxPdy (x/y mole ratio Au/Pd: 3 : 1, 1 : 1 and 1 : 3) catalysts supported on reduced graphene oxide (rGO) have been synthesised by the sol-immobilization method. The structural characteristics, surface chemistry and binding energies of all catalysts were determined by X-ray diffraction (XRD), transmission electron microscopy (TEM) and scanning electron microscopy (SEM) connected with mapping energy dispersive (EDX) as well as Raman and X-ray photoelectron spectroscopy (XPS). The TEM observations revealed that Au, Pd and AuxPdy nanoparticles are uniformly distributed on the rGO nanosheet surface, and the average particle size is 3-7 nm, with several uneven agglomerated particles. The bimetallic AuxPdy/rGO catalyst exhibited a higher catalytic activity and selectivity than the monometallic Au/rGO and Pd/rGO catalysts in the generation of hydrogen from formic acid decomposition in water at 50 degrees C under analogous reaction conditions. The higher activity of the bimetallic catalyst is ascribed to the synergetic effect of Au-Pd nanostructures and the increased reaction sites evenly distributed on the rGO support. The reusability and the recovery test of the bimetallic AuxPdy/rGO catalyst for at least five times showed an insignificant loss of 7% of its initial activity.