| The gold and silver particles which the mass ratio of silver and silver were 2.1, 2.3 and 2.5 times respectively, were prepared by fire assay. After parting of gold, the fire assay cornets samples were named as Au2.1, Au2.3 and Au2.5. Scanning electron microscopy was used to observe the surface and cross section of the samples, the results showed that the structure of three samples is three-dimensional porous structure, in which the Au2.5 sample has the largest porosity and specific surface area. The electrocatalytic activity of methanol was tested by cyclic voltammetry, and it was found that the Au2.5 sample exhibits the best electrocatalytic performance of methanol because of its the lowest onset oxidation potential and the highest oxidation peak current density which is about 4 times that of other samples. |
