Preparation Of Bimetallic Catalysts And Their Application In Carbon Dioxide Electroreductio

Carbon dioxide electroreduction,which can convert carbon dioxide into other valuable fuels or chemicals using electrical energy at room temperature and pressure,has received great attention.Among them,the reaction process of HCOOH and CO are simpler than other products,and they are easier to realize industrialization.Therefore,the design of catalysts for this reaction has become the focus of research at this stage.At present,improving catalyst performance by designing bimetallic catalysts has become one of the most effective ways to modify catalysts for carbon dioxide electroreduction.In addition,the bimetallic electronic structure can also be adjusted by other methods,such as doping or adjusting the ratio of bimetals,etc.,to further improve the synergy between metals and metals and increase the selectivity to products.Based on this,different bimetallic catalysts were designed in this paper to improve the selectivity of catalysts by utilizing the synergistic effect between their metals,as follows.NiCo LDH structure doped with La element was successfully covered on the copper hydroxide nanoarray by a simple and easy-to-operate electrodeposition method to form a nanoarray catalyst with a core-shell structure,which increased the active sites and doped at the same time La element adjusted the electronic structure of NiCo LDH and improved the selectivity and stability of the product CO（FE=64%）.In order to further improve the selectivity of the catalyst to CO,CuAg bimetallic supported CeO₂ catalyst was prepared by a simple impregnation method.Compared with the single metal Cu and Ag,the synergistic effect of the CuAg alloy greatly improved the electroreduction of carbon dioxide to carbon monoxide.The catalytic activity and selectivity（FE=84%）,and the stability of the catalyst can be maintained for at least 15 h.In addition,in order to take advantage of the superiority of the above catalyst carrier CeO₂,different contents of Bi Sn bimetallic supported CeO₂ catalysts were synthesized by impregnation method.When the ratio of Bi to Sn is 1:3,it makes the faradaic efficiency of the catalyst for HCOOH as high as 86%,and the stability can be maintained for at least 12 h.