调节氧化镉-炭黑界面高效电催化CO2还原生成CO

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CO₂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.

Efficient Electrocatalytic CO2 Reduction to CO by Tuning CdO-Carbon Black Interface

Highly efficient electrochemical CO₂ 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.