Theoretical calculations and electrochemical investigation of additives in aqueous methanesulfonic acid for lead electrodeposition

被引:6
|
作者
Jiang, Jie [1 ]
Li, Yaqiang [1 ]
Zhang, Yuanhang [1 ]
Li, Ruopeng [1 ]
Peng, Xuesong [1 ]
Zhang, Jinqiu [1 ]
Yang, Peixia [1 ]
Wang, Guangzhao [2 ]
An, Maozhong [1 ]
机构
[1] Harbin Inst Technol, Sch Chem & Chem Engn, Harbin 150001, Peoples R China
[2] Yangtze Normal Univ, Sch Elect Informat Engn, Key Lab Extraordinary Bond Engn & Adv Mat Technol, Chongqing 408100, Peoples R China
基金
中国国家自然科学基金;
关键词
Pb electrodeposition; Methanesulfonic acid; Theoretical calculations; Thiourea; TOTAL-ENERGY CALCULATIONS; WAVE-FUNCTION; RECOVERY; BATTERY; WASTE; GREEN;
D O I
10.1016/j.colsurfa.2023.132312
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
The methanesulfonate system is gradually replacing the traditional highly polluting fluoride electroplating lead (Pb) system with its eco-friendly advantage, and searching for suitable additives is crucially important to obtain uniform Pb coatings in the methanesulfonate system. In this work, a potential additive of thiourea suitable for methanesulfonate-based Pb electroplating was screened based on the theoretical calculations and cyclic voltammetry tests, and the effect of thiourea in the Pb electrodeposition was investigated. Specifically, the adsorption-coordination mechanism was proposed to explain the effect of thiourea by calculating the Bader charge density difference of thiourea on Pb surface and its interaction with Pb2+. Meanwhile, the effects of thiourea on the electrochemical behavior of lead electrodeposition were investigated by cyclic voltammetry and chronoamperometry. The nucleation and growth of Pb follow 3D diffusion-controlled progressive nucleation at the low potential and high thiourea concentration but follow 3D diffusion-controlled instantaneous nucleation at the high overpotential. The appropriate concentration of thiourea could improve the surface morphology of lead coating and make the layer flat and dense. The influence of thiourea on the crystalline orientation and grain size of the coating was analyzed, which indicated that the increase of thiourea concentration favored the formation of the Pb (220) crystal plane and the decrease of grain size.
引用
收藏
页数:11
相关论文
共 50 条