Research on electrocatalytic reduction of CO2 to methanol by advantages assembly CuAl-LDHs and CNTs
Electrocatalysis of CO2 to methanol has important research value in the carbon peaking and carbon neutrality goals.In order to improve the conversion rate of CO2 and selectivity of methanol,this paper coordinated the construction of LDHs/CNTs hybrid with acid-alkaline CuAl-LDHs and carbon nanotube materials(CNTs)with excellent electrical conductivity,realizing the complementary advantages of the two materials,and improving their methanol production performance and electrical conductivity in both directions.The results show that compared with LDHs,the good disper-sion and abundant weak base sites of the two compounds are more conducive to the adsorption and rapid diffusion of CO2 molecules on the surface of the catalyst.Meanwhile,lattice oxygen with high mobility and monovalent copper species with high reduction potential form redox cycles on the catalyst surface,significantly reducing the mass transfer resistance and electron transfer difficulty.The results showed that CuAl-LDHs/5％CNTs had high selectivity and current density towards methanol at-0.6 V(for reversible hydrogen electrodes),up to 80.7％and-6.5 mA/cm2,providing reference value for the development of LDHs-based electrocatalysts with high CO2 conversion at low potential and high current density.
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