摘要
以氯化胆碱和乙二醇混合液为低共熔溶剂,不使用其他添加剂,电化学沉积无枝晶Zn/Au合金。在不同的Zn(Ⅱ)浓度下,采用恒电位电沉积法在相对较低的Zn电沉积过电位下进行电沉积。通过循环伏安法(CV)和计时安培法(CA)揭示Zn电沉积的电化学机理。采用扫描电子显微镜和X射线衍射分析(XRD)对沉积层的形貌和结构进行表征,并用能谱仪对沉积层进行元素分析。CV结果表明,Zn的电沉积始于Zn欠电位沉积区,并一直持续到Zn过电位沉积(OPD)区。随着Zn(Ⅱ)浓度的增加,Zn/Zn(Ⅱ)电偶的沉积电位向更高的正值偏移。CA分析表明,在Zn的OPD区开始三维渐进形核,随后形成三维生长。形貌分析表明,电沉积始于致密Zn岛的形成,随后形成无枝晶Zn/Au合金。XRD分析表明,其物相为金属Zn、立方AuZn3和Au Zn金属间化合物。
The electrochemical deposition of zinc/gold dendrite-free alloys was achieved from deep eutectic solvents based on a mixture of choline chloride and ethylene glycol,without using any additives.Potentiostatic electrodeposition was carried out at relatively low Zn electrodeposition overpotential at different Zn(II)concentrations.Insight into the electrochemical mechanism of the Zn electrodeposition was revealed by cyclic voltammetry(CV)and chronoamperometry(CA).The morphology and structure of the obtained electrodeposits were characterized by scanning electron microscopy(SEM)and X-ray diffraction(XRD),while the elemental analysis was determined by energy dispersive spectroscopy(EDS)technique.The CV results showed that Zn electrodeposition commences with zinc underpotential deposition(UPD)and proceeds through the zinc overpotential deposition(OPD)region.The deposition potential of the Zn/Zn(II)couple shifts towards more positive value with increased Zn(II)concentration.CA analysis demonstrated that in the zinc OPD region,3D progressive nucleation starts,followed by 3D growth of depositing zinc.Morphological analysis revealed that electrodeposition commences with the formation of compact Zn islands and proceeds through dendrite-free zinc/gold alloys formed.A formation of several intermetallics,namely cubic AuZn3 and AuZn along with metallic zinc were identified by XRD analysis.
作者
Vesna S.CVETKOVIĆ
Nebojša D.NIKOLIĆ
Tanja S.BARUDŽIJA
Silvana B.DIMITRIJEVIĆ
Jovan N.JOVIĆEVIĆ
Vesna SCVETKOVIĆ;Nebojša DNIKOLIĆ;Tanja SBARUDŽIJA;Silvana BDIMITRIJEVIĆ;Jovan NJOVIĆEVIĆ(Department of Electrochemistry,Institute of Chemistry,Technology and Metallurgy,University of Belgrade,Njegoševa 12,11000 Belgrade,Serbia;Institute for Nuclear Sciences Vinča,University of Belgrade,P.O.Box 522,11001 Belgrade,Serbia;Mining and Metallurgy Institute,Zeleni bulevar 35,19210 Bor,Serbia)
基金
financially supported by the Ministry of Science,Technological Development and Innovation,Serbia(No:451-03-47/2023-01/200026)。
关键词
锌电沉积
低共熔溶剂
锌金合金
形貌
结构
zinc electrodeposition
deep eutectic solvent
zinc/gold alloys
morphology
structure
