Resumo

DING, K.  e  WANG, Q.. Comparison of Admittance Plots for Glass Carbon (GC) and Edge Plane Pyrolytie Graphite (EPPG) Electrodes in Three Typical Kinds of Electrolytes. Port. Electrochim. Acta [online]. 2007, vol.25, n.4, pp.401-407. ISSN 0872-1904.

Electrochemical response of glass carbon (GC) and edge plane pyrolytic graphite (EPPG) electrodes was investigated using electrochemical impedance spectroscopy (EIS) method in three kinds of electrolytes, i.e., 0.1 M Na₂SO₄ (aqueous solution), 0.1 M tetraethylammonium perchlorate (TEAP) (acetonitrile solution) and pure room temperature ionic liquids (RTILs) of 1-ethyl-3-methylimidazolium tetrafluorobroate (EMIBF4). The marked difference in the admittance plots was exhibited by the GC electrode, suggesting that the double layer occurring on GC electrode differed from each other when immersed in different electrolytes, indirectly proving the meso-porosity structure of GC electrode. While for EPPG electrode, similar results were obtained in these three selected electrolytes, which were interpreted by the "defects" in EPPG electrode.

Palavras-chave : glass carbon electrode; edge plane pyrolytic graph (EPPG) electrode; room temperature ionic liquids (RTILs); admittance plot.

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