▎ 摘　　要

NOVELTY - Preparing graphene/carbon nanotube-supported monodisperse metal atom composite catalyst involves coating electrochemical exfoliated graphene paste on a conductive support and placing in a porous insulating polymer bag as an anode, and the cathode is a pure conductive support and electrode is obtained. The electrode is electrolyzed in an electrolytic cell containing a metal source, then after the electrolysis, the solid is separated and washed, then graphene loaded with monodisperse metal atoms, and the electrolyte is recovered and used. USE - Method for preparing graphene/carbon nanotube-supported monodisperse metal atom composite catalyst for electrocatalytic reduction of carbon dioxide, and is coated on gas diffusion electrode as working electrode, saturated potassium bicarbonate in 0.1 M carbon dioxide solution for electrolysis, used in platinum sheet to electrode, saturated calomel and reference electrode, constant potential scanning, and gas phase chromatography detection for generating gas product (all claimed). ADVANTAGE - The method enables to prepare graphene/carbon nanotube-supported monodisperse metal atom composite catalyst, which has high efficiency and good material stability, improves the Faraday efficiency of the electro-catalytic reduction of carbon dioxide, high selectivity of product, effectively reduces the electro-catalytic carbon dioxide reduction needed for over-potential. DETAILED DESCRIPTION - Preparing graphene/carbon nanotube-supported monodisperse metal atom composite catalyst involves coating electrochemical exfoliated graphene paste on a conductive support and placing in a porous insulating polymer bag as an anode, and the cathode is a pure conductive support and electrode is obtained. The electrode is electrolyzed in an electrolytic cell containing a metal source, then after the electrolysis, the solid is separated and washed, then graphene loaded with monodisperse metal atoms, and the electrolyte is recovered and used. The monodisperse metal atom/graphene solid obtained is mixed with the heteroatom source material and metal source, then subjecting the mixture to a high-temperature inert atmosphere for heat treatment. The heat-treated graphene/carbon nanotubes support monodisperse metal atoms are washed with acid to remove the unstable atoms and obtaining graphene/carbon nanotube-supported monodisperse metal atom-composite catalyst as desired product.