▎ 摘　　要

NOVELTY - in-situ preparing of ultra-small size precious metal non-precious metal alloys on carbon support comprises mixing and dispersing precious metal salt, non-precious metal salt and carbon support in reducing solvent to obtain carbon carrier dispersion liquid loaded with metal ions, using laser with a wavelength of 200-400 nm for irradiating the carbon carrier dispersion liquid loaded with metal ions by laser light, preparing ultra-small-sized precious metal-non-precious metal alloys with particle size < 2 nm in situ on the carbon support. USE - The method is useful for in-situ preparing of ultra-small size precious metal non-precious metal alloys on carbon support. ADVANTAGE - The method: does not need to add any other surfactant in the preparation process; avoids the generation of other impurity product, and large particle nano-alloy particle; is simple; has easy operation, and high efficiency; and is expected to exhibit different potential in electrical, optical, biological field.