调节氧化镉-炭黑界面高效电催化CO_(2)还原生成CO

Efficient Electrocatalytic CO_(2) Reduction to CO by Tuning CdO-Carbon Black Interface

通过调节氧化镉与炭黑之间的界面实现了高效电化学二氧化碳还原.不同氧化镉和炭黑含量的CdO/CB复合材料利用超声处理方法制备.采用X射线衍射、X射线光电子能谱和透射电子显微镜对所得复合材料进行表征,揭示了其结构组成和形貌.用H型电解池对CdO/CB复合材料电催化二氧化碳还原的性能进行测试发现,CdO质量分数为20%的CdO/CB可在−1.0 V(vs.RHE)电位下获得高达92.7%的总法拉第效率,而纯CdO在相同条件下的法拉第效率仅为69.5%.CO的法拉第效率最高可达87.4%.进一步的对比实验和动力学研究结果表明,CdO/CB具有更高的电催化CO_(2)还原性能源于复合材料中氧化镉与炭黑之间的界面和高接触面积.此外,CdO/CB可在至少10 h的二氧化碳电还原反应中保持稳定的CO法拉第效率.

Highly efficient electrochemical CO_(2) reduction(ECR)was realized by tuning the interface between CdO and carbon black(CB).CdO/CB composites with different amounts of CdO and CB were prepared simply through ultrasonication.The obtained CdO/CB was characterized by a series of techniques including XRD,XPS,and TEM to reveal its composition and morphology.The ECR performance of CdO/CB composites was tested in an H-type cell.An overall ECR faradaic efficiency(FE)as high as 92.7% was achieved at -1.0 V(versus reversible hydrogen electrode)over CdO/CB with 20%(mass fraction)of CdO,in stark contrast to 69.5% over bare CdO.The highest CO FE reached 87.4%.Further control experiments and kinetic studies suggested that the enhanced catalytic activity of CdO/CB was attributed to the large contact area and interface between CdO and CB.In addition,CdO/CB exhibited stable CO FE for at least 10 h of ECR reaction.The easily accessible CdO/CB composites with tunable interface provide a feasible avenue for efficient ECR over economic electrocatalysts.