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Characterization of carbon pastes as matrices in composite electrodes for use in electrochemical capacitors

O. Martinez-Alvarez, M. Miranda-Hernandez

Dpto. Materiales Solares, Centro de Investigación en Energía, Universidad Nacional Autónoma de México, Apartado Postal 34, Temixco, Mor. 62580, México.

ARTICLE, Carbon – Science and Technology 1 (2008) 30 – 38.    

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Full Text (OPEN ACCESS) : CST-11.pdf

Keywords: Electrochemical capacitor, carbon paste, composite electrode
Abstract: Carbon paste electrodes (CPEs) were prepared from carbon black powder with different binders (Silicon Oil or Nujol). Cyclic voltammetry, chronoamperometry and chronopotentiometry techniques and different electrolytes (1M HClO4 and 1M LiClO4) were used to characterize the capacitive response and evaluate the capacitance (F/cm2, F/g) of CPEs, with and without surface modification. The surface modification was carried out by applying a potential pulse (1.35 V vs. saturated calomel electrode, SCE) at a time of 300 s, where the growth of carbon-oxygen (C-O) species were induced on the surface of the electrode. The results show that modified electrodes enhanced the capacitance and the electrolytic system has an important influence in the stability and reactivity of electrodes. The modified electrodes shows an important pseudocapacitive behavior as result of a diffusion processes that involved an interfacial reaction between the C-O species formed during the electrochemical surface treatment and the protons present in the electrolyte.



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