电化学2017，Vol.23Issue(1)：7-12,6.DOI:10.13208/j.electrochem.160318
玻碳电极表面因瓦合金的电化学成核机理
Electrochemical Nucleation of Invar Alloy on Glassy Carbon Electrode
摘要
Abstract
The linear sweep voltammetry,cyclic voltammetry and potential step methods were used to study the electrodeposition mechanism of Invar nickel-iron alloy (the mass fraction of nickel was 32～36％) on glassy carbon electrode surface in the weak acidic bath.The results demonstrate that the electrodeposition was a diffusion controlled irreversible electrode process in this system.The Scharifker-Hill (SH) theoritic model was employed to fitting the experimental data and the result shows that the codeposition of Invar alloy on glassy carbon electrode surface conformed the diffusion controlled three-dimensional instantaneous nucleation mechanism.The kinetic parameters were obtained by the Heerman-Tarallo (HT) theoretic model.When the step potential shifted from-1.11 V to-1.17 V,the active nucleation sites density (N0) increased from 0.72 x 105 cm-2 to 1.91 x 105 cm-2.The nucleation rate constant (A) raised from 40.35 s1 to 194.38 s-1 and the diffusion coefficient (D) was (7.67 ± 0.15) x 10-5 cm2·s-1,remaining basically constant.关键词
因瓦合金/电结晶/成核机理/循环伏安/电位阶跃Key words
invar alloy/electrocrystallization/nucleation mechanism/cyclic voltammetry/potential step分类
化学化工引用本文复制引用
黄先杰,闫慧,黄帅帅,杨防祖,田中群,周绍民..玻碳电极表面因瓦合金的电化学成核机理[J].电化学,2017,23(1):7-12,6.基金项目
国家自然科学基金项目(No.21621091)资助 （No.21621091）
