Nonthermal atmospheric pressure plasmas generated using noble gases act as gaseous electrodes capable of promoting electrochemical reactions when in contact with aqueous media. Despite overwhelming evidence in favor of the interfacial region between the plasma and solution being a reducing environment, the plasma-liquid interface has not been evaluated from an electrochemical perspective. Herein, we present an electrochemical method to measure the overpotential at the plasma-liquid interface of solutions containing organic redox couples. Negative overpotentials indicate that the interfacial region is a reducing environment, which is consistent with the results of colorimetric assays using redox indicators. The reaction rates are related to the magnitude of the overpotential, as expected from electrochemical kinetic models. The ability to characterize the overpotential of plasma-liquid interfaces adds to the plasma electrochemistry toolkit and contributes to efforts being made to...

中文翻译：

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等离子体-水界面的电化学表征

使用稀有气体产生的非热大气压等离子体充当气态电极，当与水介质接触时能够促进电化学反应。尽管有大量证据支持等离子体和溶液之间的界面区域是还原性环境，但尚未从电化学角度评估等离子体-液体界面。在这里，我们提出了一种电化学方法来测量包含有机氧化还原对的溶液在等离子体-液体界面的过电势。负超电势表明界面区域是还原性环境，这与使用氧化还原指示剂的比色测定结果一致。如电化学动力学模型所预期的，反应速率与过电势的大小有关。