Comparison of Admittance Plots for Glass Carbon (GC) and Edge Plane Pyrolytie Graphite (EPPG) Electrodes in Three Typical Kinds of Electrolytes

K. Ding^a,b * and Q. Wang^a

^a Chemistry College, Hebei Teacher’s University, Shijiazhuang 050016, P. R. China

^b Department of Electronic Chemistry, Interdisciplinary Graduate School of Science and Engineering, Tokyo Institute of Technology, Midori-ku, Yokohama 226-8502, Japan

Received 1^st September 2006; accepted 8^th November 2006

Abstract

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.

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* Corresponding author. E-mail address: dkeqiang@263.net