발간논문

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Vol.34, No.6, 787 ~ 794, 1996
Title
Research Paper - Physical Chemistry - : A study on the Electrochemical Redox Behaviors of Electrochemically Precipitated Nickel Hydroxides by EQCM (2)
황태섭Tai Sup Hwang, 김민석Min Seuk Kim, 김광범Kwang Bum Kim
Abstract
Electrochemical redox reactions of electrochemically precipitated nickel hydroxides were studied by using Electrochemical Quartz Crystal Microbalance and Cyclic Voltammetry. Cyclic voltamassograms showed the increase and decrease of mass of α-Ni(OH)₂ film during its oxidation and reduction, respectively. The mass change of α-Ni(OH)₂ film during redox reactions was explained by the intercalation/deintercalation of K^+ and H^+ and CO₃^(2-) ions. β-Ni(OH)₂ film, however, showed mass change behaviors completely opposite to those of α-Ni(OH)₂. Its mass change was explained by intercalation/deintercalation of H^+ ions. Phase transformaton of α-Ni(OH)₂ to βNi(OH)₂ proceeded through the formation of intermediate phases, which showed the cyclic voltammetric behavior of a single phase but behaved as a microscopic mixture of α-Ni(OH)₂ and β-Ni(OH)₂ in cyclic voltamassogram.
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