Penot Corentin, Maniam Kranthi Kumar, Paul Shiladitya
Materials Innovation Centre, School of Engineering, University of Leicester, Leicester LE1 7RH, UK.
Materials Performance and Integrity Technology Group, TWI, Cambridge CB21 6AL, UK.
Materials (Basel). 2024 Apr 16;17(8):1825. doi: 10.3390/ma17081825.
This study explores the stability of electrodeposited copper catalysts utilized in electrochemical CO reduction (ECR) across various amine media. The focus is on understanding the influence of different amine types, corrosion ramifications, and the efficacy of pulse ECR methodologies. Employing a suite of electrochemical techniques including potentiodynamic polarization, linear resistance polarization, cyclic voltammetry, and chronopotentiometry, the investigation reveals useful insights. The findings show that among the tested amines, CO-rich monoethanolamine (MEA) exhibits the highest corrosion rate. However, in most cases, the rates remain within tolerable limits for ECR operations. Primary amines, notably monoethanolamine (MEA), show enhanced compatibility with ECR processes, attributable to their resistance against carbonate salt precipitation and sustained stability over extended durations. Conversely, tertiary amines such as methyldiethanolamine (MDEA) present challenges due to the formation of carbonate salts during ECR, impeding their effective utilization. This study highlights the effectiveness of pulse ECR strategies in stabilizing ECR. A noticeable shift in cathodic potential and reduced deposit formation on the catalyst surface through periodic oxidation underscores the efficacy of such strategies. These findings offer insights for optimizing ECR in amine media, thereby providing promising pathways for advancements in CO emission reduction technologies.
本研究探讨了用于电化学CO还原（ECR）的电沉积铜催化剂在各种胺介质中的稳定性。重点在于了解不同胺类型的影响、腐蚀后果以及脉冲ECR方法的效果。采用一系列电化学技术，包括动电位极化、线性电阻极化、循环伏安法和计时电位法，该研究揭示了有用的见解。研究结果表明，在所测试的胺中，富含CO的单乙醇胺（MEA）表现出最高的腐蚀速率。然而，在大多数情况下，这些速率对于ECR操作而言仍在可容忍的范围内。伯胺，尤其是单乙醇胺（MEA），与ECR过程表现出更强的兼容性，这归因于它们对碳酸盐沉淀的抗性以及在较长时间内的持续稳定性。相反，叔胺如甲基二乙醇胺（MDEA）由于在ECR过程中形成碳酸盐而带来挑战，阻碍了它们的有效利用。本研究突出了脉冲ECR策略在稳定ECR方面的有效性。通过周期性氧化，阴极电位的显著变化以及催化剂表面沉积物形成的减少突出了此类策略的有效性。这些发现为优化胺介质中的ECR提供了见解，从而为CO减排技术的进步提供了有前景的途径。
