| Title |
Research Paper - Physical Chemistry - : A study on the Electrochemical Redox Behaviors of Electrochemically Precipitated Nickel Hydroxides by EQCM (2) |
| Authors |
황태섭(Tai Sup Hwang); 김민석(Min Seuk Kim); 김광범(Kwang 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. |