Electrochemical CO₂ reduction driven by renewable electricity provides a promising strategy for the ambient synthesis of CO. While great efforts were being devoted to developing highly efficient catalysts for electrochemical CO₂ reduction reactions (CO₂RRs), electrode improvement is another important direction for the real-world application of CO₂ conversion. Toward a better understanding on the mechanism of the highly selective CO₂RR catalyst on the electrode, an in-situ, high-resolution, and high-speed microscale visualization techniques are applied to observe the generation and detachment of the CO₂RR products (CO and H₂) on the electrode coated with molecularly dispersed electrocatalyst of methoxy group functionalized nickel phthalocyanine (NiPc-OMe MDE). The catalyst exhibits superb selectivity towards CO formation with Faradic efficiency above 98% from −0.56 V to −0.77 V vs. RHE and approaches 100% at −0.65 V vs. RHE. The CO and H₂ bubbles are observed in CO₂ and Ar atmosphere, which provide direct evidence for the high selectivity of NiPc-OMe MDE. Additionally, the number of reaction regions and their gas production rate increase as the applied cathodic potential increases. The in-situ optical visualization method employed in the electrochemical test system contributes to better electrode design of the CO₂ electrolyzer to accelerate the transition from lab-scale investigation to industrialization.

由可再生电力驱动的电化学还原CO ₂提供了一种在环境中合成CO的有前途的策略。尽管人们致力于开发用于电化学还原CO _2的高效催化剂（CO ₂ RRs），但电极的改进是该领域的另一个重要方向。实际应用中的CO ₂转化。为了更好地了解电极上的高选择性CO ₂ RR催化剂的机理，采用原位，高分辨率和高速微尺度可视化技术观察CO ₂ RR产物的产生和分离（ CO和H ₂）涂在分子分散的甲氧基官能化的酞菁镍（NiPc-OMe MDE）电催化剂上的电极上。相对于RHE，该催化剂表现出对CO形成的极佳选择性，法拉第效率从-0.56 V至-0.77 V高于98％，而在-0.65 V vs. RHE时接近100％。在CO ₂和Ar气氛中观察到CO和H ₂气泡，这为NiPc-OMe MDE的高选择性提供了直接证据。另外，随着所施加的阴极电位的增加，反应区域的数量及其气体产生速率也增加。在原位在电化学测试系统有助于用于将CO的更好的电极设计的光学可视化方法₂ 电解槽，以加速从实验室规模的研究向工业化的过渡。