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 (H_opd)-terminated Pt electrodeposition. On a more appropriate catalyst support for proton-exchange membrane fuel cells (PEMFCs), namely, the native oxide on metallic titanium (TiO_x/Ti), the synthesis is disrupted by preadsorption of the monolayer-limiting agent. The role of auxiliary NaCl during H_opd-terminated Pt electrodeposition (chloride-assisted H_opd termination) on TiO_x/Ti is investigated and discloses effects similar to CO observed previously.

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“近似” Pt单层是具有高质量活性的氧还原反应（ORR）催化剂的理想形态。通过单层限制的CO或过电位沉积的氢（H _opd）端接的Pt电沉积，可以可靠地在金上合成此类结构。在用于质子交换膜燃料电池（PEMFC）的更合适的催化剂载体上，即金属钛上的天然氧化物（TiO _x / Ti），通过单层限制剂的预吸附破坏了合成。研究了辅助NaCl在TiO _x / Ti上以H _opd终止的Pt电沉积（氯化物辅助的H _opd终止）过程中的作用，并揭示了与先前观察到的CO相似的作用。

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