Study On Preparation And Performance Of Copper-based Catalyst For Electrochemical Reduction Of Carbon Dioxide

Under the dual pressures of energy crisis and environmental issues,CO₂ resource utilization has become an effective way.Using electrical energy to convert carbon dioxide into fuels is an attractive solution but remains a grand challenge.In the field of electrochemical reduction of CO₂,due to the strong stability of CO₂ molecules,there are some issues such as high potential and low energy efficiency,designing and obtaining high-performance catalyst materials is the direction of the researchers’efforts.In order to solve the problems of low energy efficiency of CO₂ electrochemical reduction and difficult separation of reaction products,this paper optimized the design of copper-based electrode materials to enhance the catalytic activity and improve product selectivity of electrode materials and developed an easy-to-control and high-performance copper-based copper reduction catalyst.In this paper,a Cu-Ni nanocone array was successfully synthesized on a copper foil substrate by a simple potentiostatic electrodeposition method（denoted Ni-Cu）.Subsequently,the as-prepared Ni-Cu electrode material was doped with gold by in-situ reduction method（denoted Au-Ni-Cu）;and then the doping amount of gold elements was adjusted to obtain Au-Ni-Cu with different gold content,the selective control of C2 products by electrochemical reduction of CO₂ is achieved.Among them,under the electrode potential of-1.0V（vs relative to reversible hydrogen;RHE）,the faradaic efficiency of C₂H₅OH reaches up to about 30%at Au300-Ni-Cu,high selectivity to C₂H₅OH was achieved;while under the electrode potential of-1.1 V（vs RHE）,the faradaic efficiency of C₂H₄ reaches up to about 40%at Ni-Cu,high selectivity to C₂H₄ was achieved.In addition,these catalysts showed a stable CO₂electroreduction capability up to 24h and maintained a stable current density and product Faraday efficiency.The excellent electrocatalytic property of Au-Ni-Cu is attributed to the structure of nanocone array and the doping of gold.The raw materials of the catalyst are easily obtained and the preparation method is relatively simple,the design and optimization methods bring novel ideas and opportunities for achieving CO₂ reduction catalyst with high product selectivity and strong stability.