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首页> 外文期刊>Electrochimica Acta >Qualitative Electrochemical Impedance Spectroscopy study of ion transport into sub-nanometer carbon pores in Electrochemical Double Layer Capacitor electrodes
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Qualitative Electrochemical Impedance Spectroscopy study of ion transport into sub-nanometer carbon pores in Electrochemical Double Layer Capacitor electrodes

机译：离子迁移到电化学双层电容器电极中亚纳米碳孔中的定性电化学阻抗谱研究

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摘要

Ion adsorption onto high surface area microporous Carbide Derived Carbons (CDCs) with pore sizes in the sub-nanometer range was studied by means of the Electrochemical Impedance Spectroscopy (EIS) technique in two electrolytes, Tetraethylammonium Tetrafluoroborate (NEt_4BF_4) in Acetonitrile (AN) and in Propylene Carbonate (PC). Polarization at two bias voltages (0.5 V/Ref and -1 V/Ref) for EIS measurements enabled comparing the capacitive behaviors resulting from anions and cations adsorption, respectively, it was confirmed that the effective size of NEt_4~+ is bigger than the one of BF_4~-. Higher transport limitation was then observed for cations and was exalted in PC-based electrolyte. Although slow ion transport kinetics, it was found that the low frequency vertical line observed on the Nyquist plots was preserved meaning that carbon electrodes were fully charged. This study confirmed the importance of choosing an electrode carbon pore size adapted to the effective ion size. Finally, the best performances would be got in 1.5 M NEt_4BF_4 AN-based electrolyte with a 0.76 nm pore size negative electrode and a 0.68 nm pore size positive electrode.
机译：通过电化学阻抗谱（EIS）技术研究了两种电解质在乙腈（AN）和乙腈中的四氟硼酸四乙铵四氟硼酸酯（NEt_4BF_4）上的离子吸附在孔径为亚纳米级的高表面积微孔碳化物衍生碳（CDC）上的过程。在碳酸丙烯酯（PC）中。进行EIS测量时，在两个偏置电压（0.5 V / Ref和-1 V / Ref）下的极化能够分别比较由阴离子和阳离子吸附引起的电容行为，已证实NEt_4〜+的有效尺寸大于一个BF_4〜-。然后观察到阳离子具有更高的传输限制，并且在基于PC的电解质中被提高。尽管离子传输动力学较慢，但发现保留了在奈奎斯特图中观察到的低频垂直线，这意味着碳电极已充满电。这项研究证实了选择适合于有效离子尺寸的电极碳孔径的重要性。最后，在具有0.76 nm孔径负极和0.68 nm孔径正极的1.5 M NEt_4BF_4 AN基电解质中，将获得最佳性能。

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