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Electrochemistry Investigation on the Graphene/Electrolyte Interface

机译：石墨烯/电解质界面的电化学研究

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In this study, the graphene/electrolyte interface was investigated in detail by the electrochemical method. The total interface capacitance was calculated from the electrochemical impedance spectroscopy (EIS) results, and its responses to different concentrations and pHs were also investigated. The minimum point of the capacitance was found to shift to right (vs. Ag/AgCl) as the concentration increased, and to left with increasing pH. As a comparison, gold/electrolyte interface was investigated in the same way, but didn't show the similar behavior. To further explore the interface capacitance, proper models were proposed to fit the EIS results. Two constant-phase elements (CPE) were used in the graphene-electrolyte interface model to represent the double-layer capacitance (CPEdl) and the quantum capacitance (CPEq)(,) respectively. The CPEq exhibited its sensitivity to concentration and pH, while CPEdl did not. This study gives a new aspect to detect concentration and pH, and may provide a reference for the graphene-based supercapacitor research.
机译：在这项研究中，通过电化学方法详细研究了石墨烯/电解质的界面。从电化学阻抗谱（EIS）结果计算出总界面电容，并研究了其对不同浓度和pH的响应。发现电容的最小点随着浓度的增加而向右移动（相对于Ag / AgCl），而随着pH的增加向左移动。作为比较，以相同的方式研究了金/电解质界面，但未显示出相似的行为。为了进一步探索接口电容，提出了适合EIS结果的适当模型。在石墨烯-电解质界面模型中使用了两个恒定相元素（CPE）分别表示双层电容（CPEdl）和量子电容（CPEq）（，）。 CPEq表现出对浓度和pH的敏感性，而CPEd1没有。这项研究为检测浓度和pH值提供了一个新的方面，并可能为基于石墨烯的超级电容器研究提供参考。

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