Acta Phys. -Chim. Sin. ›› 2002, Vol. 18 ›› Issue (02): 183-187.doi: 10.3866/PKU.WHXB20020219

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Performance of the Combined Electrode with Micro Holes Needling through the Insulating Film of Carbon Rod

Zhao Kai-Yuan;Wang Yu-Qing   

  1. Department of Chemistry, College of Sience and Technology of Suzhou, Suzhou 215009
  • Received:2001-07-17 Revised:2001-10-17 Published:2002-02-15
  • Contact: Zhao Kai-Yuan

Abstract: A microelectrode is combined with micro holes formed by needling through the insulating film of carbon rod. (see Fig.1). The cyclic voltammogram(see Fig.2) of this electrode determined in solution of K3Fe(CN)6/K4Fe(CN)6 are fully identical with the theoretical curves. The limiting diffusion current determined from step scanning volt-ammetry method is in good linear relation with the concentration of K4Fe(CN)6 solution(see Fig.5) and with the square of scanning rate.   The cyclic voltammetric curve of Cd2+ in solution with base electrolyte KCl is an irreversible process(see Fig.3). The current of reduce peak (at -0.98 V vs SCE), determined from step scanning voltammetric method at 800 mV•s-1 scanning rate, is in good linear relation with the concentration of Cd2+ at 2.55×10-5 mol•dm-3 to 1.28×10-4 mol•dm-3.

Key words: Combinaed micro plate electrode, Cyclic voltamogram, Step scanning voltammetric method, Micro hole, Cadmium