Acta Phys. -Chim. Sin. ›› 2006, Vol. 22 ›› Issue (04): 502-506.doi: 10.3866/PKU.WHXB20060422

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Effect of SDS on the Electrochemical Oscillation of Nickel in HNO3/Cl-/H2O Solution

NI Wen-Bin;LIU Tian-Qing;GUO Rong   

  1. School of Chemistry and Chemical Engineering, Yangzhou University, Yangzhou 225002, P. R. China
  • Received:2005-09-09 Revised:2005-12-01 Published:2006-04-10
  • Contact: LIU, Tian-Qing

Abstract: The anionic surfactant SDS can control the current oscillation of nickel in 0.5 mol•L-1 HNO3/0.005 mol•L-1 Cl-/H2O system. During the current oscillation, differential capacitance and conductance oscillations are found at the nickel electrode. With the increase of SDS concentration, the amplitudes of the differential capacitance and conductance oscillations all decrease gradually. The functionary mechanism of SDS in the current oscillations and passivation processes is explained.

Key words: Electrochemical oscillation, Impedance, Nickel, HNO3, SDS