Abstract

Controlling the Pt(111)-OH_ad stability by means of noncovalent interactions with hydrated cations, it was possible to modify natural changes in the galvanostatic time-series collected during ethylene glycol electro-oxidation reaction. These modifications, also known as drift, include maximum potential in each oscillation cycle, oscillation patterns, and frequency changes. The phenomenon was investigated in a temperature range from 5 to 20 °C and allows us to infer about the sensitiveness of time-series in the presence of distinct alkaline cations. The stable OH_ad layer in the presence of Li⁺ induces lower drift in the time-series, resulting in a longer time-series with oscillatory behavior. On the other hand, once the OH_ad layer is less stable in the Na⁺ electrolyte, the formation of surface oxides from Pt-OH happens at lower potential than in the LiOH solution, resulting in fast changes of both the maximum potential and oscillation frequency and short time-series, i.e., the drift becoming higher. Finally, the conversion of Pt-OH onto Pt oxides is still easier in KOH solutions, producing short time-series and does not allow the oscillatory behavior.

Graphical abstract

中文翻译：

---

通过Pt（111）-OH ad稳定调节振荡时间序列的演化

摘要

控制的Pt（111）-OH_广告通过与水合的阳离子非共价相互作用的手段稳定性，这是可能的修改在乙二醇电氧化反应过程中收集的恒电流时间序列的自然变化。这些修改（也称为漂移）包括每个振荡周期中的最大电势，振荡模式和频率变化。在5至20°C的温度范围内对这种现象进行了研究，它使我们可以推断出在存在明显碱性阳离子的情况下时间序列的敏感性。Li ⁺存在下稳定的OH _ad层引起较低的漂移时间序列中的时间序列，导致具有振荡行为的时间序列更长。另一方面，一旦OH _ad层在Na ⁺电解质中的稳定性较差，则由Pt-OH形成的表面氧化物会以比LiOH溶液更低的电势发生，从而导致最大电势和振荡频率快速变化。时间序列短，即漂移变大。最后，在KOH溶液中，Pt-OH到Pt氧化物的转化仍然更容易，产生的时间序列短，并且没有振荡行为。