MOF-derived Carbon Supported Metal Catalyst For The Electrochemical Reduction Of CO₂

Since the industrial revolution,the concentration of carbon dioxide（CO₂）in the atmosphere has risen sharply,causing serious greenhouse effect.Therefore,reducing the concentration of carbon dioxide in the atmosphere has become a research hotspot of global environment and energy.Electrocatalytic CO₂ reduction（CO₂RR）is one of the most promising technologies for carbon neutralization at present.However,due to the high chemical inertia of linear CO₂ molecules and the competitive hydrogen evolution reaction（HER）,it is still very challenging to achieve the stable conversion of CO₂ with high activity and high selectivity on the catalyst surface.Carbon supported transition metal catalysts have attracted much attention in recent years because of their unique catalytic performance.Metal-organic framework compound（MOF）derived carbon materials have large specific surface area and abundant nitrogen heteroatoms,which can effectively anchor metal atoms.（1）Ni-MOF precursors were synthesized by introducing 2-methylimidazole as a competitive ligand at room temperature.Small Ni nanoparticles（about 19.4 nm）with narrow size distribution confined to nitrogen-doped carbon were successfully constructed by a simple one-step calcination method.Because of the protective nitrogen doping graphitized carbon shell and in 13 to 21 nm within the narrow range of tiny nickel nanoparticles,uniform distribution of nitrogen doped carbon load nickel nanoparticles catalyst（Ni NPs@N-C）under 1.0 V,the efficiency of CO generated by the Faraday（FE）is as high as 96.8%,and the catalyst still has excellent stability within 24 hours.（2）the introduction of Sn and Cu ions for double metal source,under the condition of hydrothermal synthesis Cn Sn double metal doped UIO-66 as the precursor,using Zr ions and organic ligands and Sn Cu ions separation to avoid aggregation in the process of high temperature carbonization,thus successfully constructed the metal ions,uniform distribution of carbon load Cu Sn bimetallic nanoparticles catalyst（Cu Sn@C）,based on the synergy of Cu and Sn bimetallic active sites,Cu Sn@C under 1.1 V,the efficiency of CO generated by the Faraday（FE）is as high as 75%,The current density is 2.7 m A cm^-2.