聚乙二醇对二氧化铅电沉积机理的影响

发布时间：2018-05-09 18:26

本文选题：PEG + PbO结构　；参考：《化学研究与应用》2017年12期

【摘要】：为研究有机添加剂聚乙二醇(PEG)对电沉积PbO_2的影响,在含有PEG的硝酸盐体系中,制备了Ti/PbO_2电极材料。利用XRD,SEM,研究了PbO_2电极材料的物相组成及镀层形貌;利用循环伏安法和计时电流法,结合Scharifker-Hill(SH)三维成核模型,研究了PEG对PbO_2电沉积行为及电结晶动力学过程的影响。结果表明:制备的镀层为β-PbO_2,PEG可改变晶面择优生长取向,但不改变晶型;PbO_2晶粒的长大遵循"广义电化学综合生长机理",PEG可细化PbO_2晶粒,消除镀层缺陷;PEG不仅提高了PbO_2在基体上的沉积量,而且加强了PbO_2自身的催化效果,促进其进一步沉积;PEG的加入提高了Pb~(2+)的扩散系数,有利于Pb~(2+)向电极界面的扩散;PEG使PbO_2电结晶由连续成核转变为瞬时成核,同时,也使二氧化铅形核速率加快,但其成核量却显著减少。
[Abstract]:In order to study the effect of polyethylene glycol (PEG), an organic additive, on electrodeposition of PbO_2, Ti/PbO_2 electrode materials were prepared in nitrate system containing PEG. The phase composition and coating morphology of PbO_2 electrode materials were studied by XRDX SEM, and the effects of PEG on the electrodeposition behavior and electrocrystallization kinetics of PbO_2 were studied by cyclic voltammetry and chronoamperometry, combined with the Scharifker-Hillsberg SH3 D nucleation model. The results show that 尾 -PbO _ 2PEG can change the preferred growth orientation of the crystal plane, but the grain growth of PbO _ 2 follows the "generalized electrochemical growth mechanism" to refine the PbO_2 grains. Removing the defects of PbO_2 not only increases the amount of PbO_2 deposited on the substrate, but also enhances the catalytic effect of PbO_2 itself, and promotes the addition of PbO_2 to further deposition of PbO_2 to increase the diffusion coefficient of Pb~(2. In favor of the diffusion of Pb~(2 to the electrode interface, the electrocrystallization of PbO_2 changed from continuous nucleation to instantaneous nucleation. At the same time, the nucleation rate of lead dioxide was accelerated, but the nucleation amount was significantly reduced.
【作者单位】：昆明冶金高等专科学校;昆明理工大学;
【基金】：国家自然科学基金项目(51464021)资助
【分类号】：O646

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