Addressing the Use of Cu in PdCu Binary Alloy Catalysts for PEMFCs

Thank you for raising this important point about the use of Cu in PdCu alloy catalysts for PEMFCs. We understand your concern regarding the standard reduction potential of Cu, which falls within the operating window of the cell and can lead to Cu dissolution and redeposition within the membrane. However, it's crucial to recognize the well-established and significant role of PdCu alloys in electrocatalysis. Numerous studies have demonstrated their potential in diverse applications, including PEMFCs.

For example, Martinez-Casillas et al. (J. Power Sources 2011, 196, 4468-4474) have successfully prepared PdCu catalysts for PEMFCs. Zhang et al. (Int. J. Hydrogen Energy 2013, 38, 10029-10038) have utilized nanoporous PdCu alloys as methanol-resistant oxygen reduction reaction catalysts. Furthermore, Wu et al. (ACS Appl. Mater. Interfaces 2015, 7, 25906-25913) have investigated the influence of various factors, including size, composition, and surface properties, on the electrocatalytic activity of PdCu alloy nanoparticle catalysts.

These studies underscore the potential and significance of PdCu binary alloy catalysts in various electrocatalytic processes. Therefore, further research on the basis of this catalyst is crucial for understanding its specific benefits and limitations in the context of PEMFC applications. This research has the potential to advance the field and contribute to the development of more efficient and durable fuel cells.

While the standard reduction potential of Cu may raise concerns, the extensive research on PdCu alloys demonstrates their feasibility and relevance in electrocatalysis. We believe that further investigation into the PdCu catalyst is warranted and can provide valuable insights for improving PEMFC technology. Thank you for your comment, which has provided an opportunity to address this important aspect of our research.