1-丁基-3-甲基咪唑氯盐离子液体中副反应电沉积锌的机理  

Electrodeposition Mechanism of Zn^(2+) Ion in 1-Butyl-3-Methylimidazolium Chloride Ionic Liquid

作　　者：杨慧敏[1] 刘宪[1] 代红艳[1] 张力[1] 梁镇海[1] 

机构地区：[1]太原理工大学化学化工学院,山西太原030024

出　　处：《材料保护》2015年第1期9-13,6,共5页Materials Protection

摘　　要：利用在离子液体中电合成Zn4O13C24H12(MOF-5)时的副反应沉积Zn2+,形成锌层,目前国内外尚无报道。应用循环伏安、交流阻抗、极化曲线等方法研究了在离子液体1-丁基-3-甲基咪唑氯盐体系中Zn2+的阴极电沉积过程、沉积机理。结果表明:Zn2+的沉积机理是一个不可逆的反应,且在一定范围内,其还原峰电流与扫描速度的平方根v1/2成明显的线性关系,该反应属于扩散控制;离子液体与有机配体的协同作用促进了反应电极上的电子转移;用极化曲线和电化学理论推导式计算出的该反应的阴、阳极表观传递系数、反应级数均为1,反应历程有3步,第2步为控制步骤。Cyclic voltammetry,alternating current impedance spectrometry,and polarization curve measurement were applied to investigate the cathodic electrodeposition process and mechanism of Zn^(2+) in 1-butyl-3-methylimidazolium chloride ionic liquid.Furthermore,the cathode and anode apparent transfer coefficients as well as the reaction orders were derived in association with relevant electrochemical theory.Results indicated that the deposition of Zn^(2+) in the ionic liquid was an irreversible process,and the reduction peak current was linearly proportional to v^(1/2)(the scan rate) within a certain range,which indicated that the deposition reaction of Zn^(2+) was controlled by the diffusion process.Moreover,the ionic liquid synergistically functioned with the organic complexing agent thereby accelerating the elctron transfer at the reaction anodes.The cathode and anode apparent transfer coefficients of the reaction and the reaction orders were all determined to be 1,and the deposition reaction of Zn^(2+) involved 3 steps,with the second step as the control one.

关 键 词：离子液体 1-丁基-3-甲基咪唑氯盐 Zn-2+阴极电沉积 电还原机理 

分 类 号：TQ153.15[化学工程—电化学工业]