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Study on the Electrochemical Behavior of Zinc Electrodes Embellished in Alkaline Media

Author: HanLianZuo
Tutor: ZhangShengTao
School: Chongqing University
Course: Physical and chemical
Keywords: Corrosion Inhibitor Zinc electrode Alkaline medium Electrochemical behavior
CLC: O646
Type: Master's thesis
Year: 2002
Downloads: 165
Quote: 0
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Abstract


Zinc has a charge-discharge reversibility good electrochemical equivalent small, the hydrogen potential higher anodic dissolution uniform and resource-rich, and has been widely applied in many areas. Especially zinc negative electrode material as a chemical power, has good electrical properties obtained widespread attention. However, due to the presence of the zinc electrode deformation, dendrite, corrosion and passivation performance to reduce the zinc electrode for secondary power, which is zinc batteries serious problems that exist in the application. Therefore, proper selection and to explore the effect of additives on the electrochemical behavior of zinc in alkaline medium and electrode performance, further broaden the choice of the zinc electrode corrosion inhibitor, improve battery performance has important theoretical significance and practical value. The paper application grazing incidence ellipsometry test technology combined with cyclic voltammetry, galvanostatic step, moving potentiodynamic polarization and electrochemical methods, site visits of Bi, La, Ce metal ions containing polyoxyethylene groups of non-ionic surfactants Tween 20, Tween 60, Tween 80 as electrolyte additive on the electrochemical behavior of zinc electrode; adsorption behavior of the surface of the zinc electrode of Twain Series inhibitor, corrosion behavior research, to explore its existence The corrosion mechanism; Twain series differences in non-polar groups of the inhibitor on the corrosion inhibition and inhibition mechanism. The experiments show that: Bi, La, Ce metal ions on the anodic dissolution of the zinc electrode has a certain role in promoting different cathode process, in which bismuth ions is more conducive to suppress the deformation of the zinc electrode in the cathodic deposition process and dendrite ; Twain Series inhibitor are mixed type inhibitor molecules adsorbed on the electrode surface Freundlich isotherm; suitable concentration of Tween Series inhibitor beneficial to inhibit the dendrites of the zinc electrode, deformation, improve zinc the cycle life of the electrode. Tween 20 Inhibition the role belongs geometric covering effect, the Tween 60 INHIBITION mainly for the negative catalytic effect of adsorbed particles. Spectroscopic ellipsometry experiments show Tween 80 molecules exist negative catalytic effect of corrosion inhibition at lower concentrations (lt; 10-3g · dm-3) mainly to cover the effect of adsorbed particles geometry, while Tween 80 added amount greater than 10-3g · dm-3, the corrosion inhibition mainly adsorbed particles negative catalytic effect. In addition, the experiments also showed that the structure of the non-polar group (carbon chain) the presence of its INHIBITION significantly affected, under the premise to meet the solubility needs, non-polar group is longer saturated carbon chain molecules may have better inhibition effect.

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CLC: > Mathematical sciences and chemical > Chemistry > Physical Chemistry ( theoretical chemistry ),chemical physics > Electrochemical,electrolytic,magnetic,chemical
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