使用可再生电能驱动二氧化碳还原的反应具有条件绿色温和、反应可控的优点,其产物的组成与生成效率由催化剂的组分、结构决定.铜基催化剂可以将二氧化碳电还原为高附加值的多碳产物.然而,Cu+催化活性中心容易被还原,不稳定,导致产物选择性差和稳定性差.基于此,本文通过铈元素掺杂调控了 Cu2O的电子结构,提升了 Cu+的催化活性.铈元素掺杂的Cu2O催化剂具有10％以上的乙烯法拉第效率,其中-1.2 V vs HER时,Ce-Cu2O生成C2H4的法拉第效率可以达到17.8％;同时,Ce-Cu2O也展现出优异的循环稳定性,这为CO2电化学还原长期稳定运行提供了材料基础.
Preparation of Cerium Doped Cuprous Oxide and Its Performance in Electrocatalytic CO2 Reduction to Ethylene
The use of renewable electricity to drive carbon dioxide reduction reactions has the advantage of being environ-mentally friendly,mild,and controllable.The composition and yield of the product are determined by the components and structure of the catalyst.Copper-based catalysts can electrochemically reduce carbon dioxide into high-value multi-carbon products.However,the Cu+catalytic active center is easily reduced,unstable,leading to poor product selectivity and stabili-ty.Based on this,the electronic structure of Cu2O was modulated by cerium element doping,thereby enhancing the catalytic activity of Cu+.The Ce-doped Cu2O catalyst has a Faraday efficiency of over 10％for ethylene,with a Faraday efficiency of 17.8％for the production of C2H4 at-1.2 V vs HER for CeCu2O.Meanwhile,Ce-Cu2O also exhibits excellent cycling stabil-ity,which provides a material basis for the long-term stable operation of CO2 electrochemical reduction.
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