锌电极在浓碱中振荡电溶解的表面物种和形貌研究  

Studies of surface species and morphology in the oscillatory electrodissolution of Zn electrodes in concentrated alkaline solutions

作　　者：陈欣[1] 郑菊芳[1] 

机构地区：[1]浙江师范大学物理化学研究所浙江省固体表面反应化学重点实验室,浙江金华321004

出　　处：《浙江师范大学学报（自然科学版）》2009年第2期199-202,共4页Journal of Zhejiang Normal University:Natural Sciences

基　　金：国家自然科学基金资助项目(20373063)

摘　　要：采用电化学循环伏安、恒电势技术详细考察了浓碱条件下金属锌的电化学行为,利用扫描电子显微镜(SEM)和X-射线能谱仪(EDS)分析了经电化学腐蚀后锌电极的表面形貌及组成.结果表明:在电化学循环伏安交叉环电势区,恒电势电流振荡条件下在电极表面可产生纳米锌氧化物阵列或薄膜;此外,电化学循环伏安反扫电流远大于正扫电流的主要原因是电极表面锌氧化物/氢氧化物钝化物种的生成与活性络合溶解,这也是电流振荡的主要原因.Techniques of cyclic voltammetry and potentiostatic control were applied to study the electrochemical behaviors of zinc in concentrated alkaline media. The surface morphology and composition of zinc electrodes subjecting electrochemical corrosion were characterized by scanning electron microscopy （ SEM ） and X- ray energy dispersive spectra （EDS） respectively. These experiments showed that nanoarrays or nanofilms of zinc （ hydr ） oxides could form under potentiostatic current oscillations in the potential region of crossing cycle appearing in the cyclic voltammograms. In addition, the lager current value for the backward scan than that for the forward scan in the cyclic voltammograms was mainly attributed to the formation and dissolution of passivating （hydr）oxides of zinc on the electrode surface, which also accounted for the current oscillations.

关 键 词：交叉环 电流振荡 纳米 锌氧化物 

分 类 号：O614.241[理学—无机化学]