Abstract
An “approximate” Pt monolayer is a desirable morphology for oxygen reduction reaction (ORR) catalysts with high mass activity. Such structures can, reliably, be synthesized on gold by monolayer-limited CO- or over-potential deposited hydrogen (Hopd)-terminated Pt electrodeposition. On a more appropriate catalyst support for proton-exchange membrane fuel cells (PEMFCs), namely, the native oxide on metallic titanium (TiOx/Ti), the synthesis is disrupted by preadsorption of the monolayer-limiting agent. The role of auxiliary NaCl during Hopd-terminated Pt electrodeposition (chloride-assisted Hopd termination) on TiOx/Ti is investigated and discloses effects similar to CO observed previously.
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Proch, S., Yoshino, S., Kitazumi, K. et al. Over-Potential Deposited Hydrogen (Hopd) as Terminating Agent for Platinum and Gold Electro(co)Deposition. Electrocatalysis 10, 591–603 (2019). https://doi.org/10.1007/s12678-019-00551-4
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DOI: https://doi.org/10.1007/s12678-019-00551-4