電気化学インピーダンス測定法を用いたスルファミン酸ニッケル電解液中における多結晶ニッケル表面の電気化学反応に関する研究

概要

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Electrochemical impedance spectroscopy measurements under a smal alternating current were performed to investigate the electrochemical reactions on poly-crystalline nickel surfaces in nickel sulfamate electrolyte. The Nyquist diagrams exhibit the absence of inductive loops for the frequency range from 50MHz to 100kHz. A condition for the existence of inductive loops derived in this study suggests that the electrocrystallization of Ni^<2+> ions may take place in the slow reaction step Ni^<2+>+e^-→Ni^+_<ads> and fast reaction step Ni^+_<ads>+e^-→Ni. In addition, the reaction impedances are found to have two exponents that slightly deviate from the values predicted by a homogeneous charge-transfer reaction model.
一般社団法人日本機械学会の論文
2004-02-25