CuO/ZnO复合电催化剂的制备及其还原CO_(2)制合成气

CuO/ZnO Composite Electrocatalyst:Preparation and Reduction of CO_(2) to Syngas

二氧化碳(CO_(2))还原制备合成气(CO和H2混合气),不仅可以实现碳循环降低温室效应,而且能缓解能源危机,而实现CO_(2)资源化利用的关键在于催化剂设计。本研究采用金属离子共沉淀法制备了CuO及CuO/ZnO复合氧化物纳米材料,通过调节催化剂组分,探究其在不同电势下电化学CO_(2)还原制备合成气的性能。结果表明:引入锌(Zn)物种可以减弱中间物CO_(2)•–在催化剂上的吸附强度,导致CO的法拉第效率(FE)降低,氢气FE增加,从而实现不同电势下合成气CO/H2在1/1~1/4范围内的可控调节。尤其是,当前驱液中铜和锌配比为1:2时,在–0.9 V(vs.RHE)的电势下,CO和H2总FE高达84%。

The reduction of carbon dioxide(CO_(2))to syngas(a mixture of CO and H2)can not only realize the carbon cycle and decrease the greenhouse effect but also alleviate the energy crisis.Design of catalyst is the key to realize CO_(2) resource utilization.Herein,CuO and CuO/ZnO composite were prepared by metal ion co-precipitation method,and their performance of electrochemical CO_(2) reduction to syngas under different potentials was investigated by adjusting the catalyst components.The results show that the introduction of zinc(Zn)species can decrease the adsorption intensity of intermediate CO_(2)•–on the catalyst,which leads to the decrease of Faraday efficiency(FE)of CO and the increase of FE of H2,thus achieving controllable regulation of CO/H2 in the range of 1/1–1/4 under different applied electrochemical potential.In particular,the total FE of syngas CO/H2 is up to 84%when the ratio of Cu to Zn in the precursor solution is 1:2.