Nd(Ⅲ)离子在Ni基电极微区扫描电化学显微研究  

Scanning electrochemical microscopy study of Nd(Ⅲ)ions in microzone of Ni-based electrode

作　　者：解成 彭军军 王旭 廖春发[1,2] XIE Cheng;PENG Junjun;WANG Xu;LIAO Chunfa(Jiangxi Provincial Key Laboratory of High-Performance Steel and Iron Alloy Materials,Ganzhou 341000,China;School of Metallurgical Engineering,Jiangxi University of Science and Technology,Ganzhou 341000,China)

机构地区：[1]高性能钢铁合金材料江西省重点实验室,赣州341000 [2]江西理工大学冶金工程学院,赣州341000

出　　处：《江西冶金》2025年第2期147-152,共6页Jiangxi Metallurgy

基　　金：国家自然科学基金项目(52074134,52474328)。

摘　　要：探索Nd(Ⅲ)离子在活性电极表面原位还原机制对优化熔盐电解制备Pr-Nd合金工艺过程具有重要的理论和现实意义。本研究采用扫描电化学显微技术(SECM)与计时电流分析相结合的方法,通过产生-收集模式原位分析Nd(Ⅲ)离子在不同电位条件下Ni阴极基体微区的电流响应及形核规律。结果表明,随着施加在Ni阴极基体表面电位在-0.6~-1.0 V (vs.Ag/AgCl)范围内负移,表面活性位点逐渐增多且分布更均匀,电流峰强度最高值由低于0.003μA逐渐增大至0.004μA。水溶液体系中激活的Nd(Ⅲ)离子在Ni阴极表面的二维形核区域不断增大,三维形核活性位点也不断增加且均匀分布。Nd(Ⅲ)离子在Ni基电极表面的主要形核方式为瞬时形核,Nd(Ⅲ)离子扩散系数约为8.57×10^(-9)m^(2)/s。The clarification of the in situ reduction mechanism of Nd(Ⅲ)ions on the surface of reactive electrodes is of great theoretical and practical significance for the optimization of the process for preparing Pr-Nd alloys by molten salt electrolysis.In this work,electrochemical scanning microscopy(SECM)and chronoamperometry were used to analyze the current response and nucleation pattern of Nd(Ⅲ)ions in the microzone on the Ni cathode surface under different potentials in the generation-collection mode.The results showed that the surface potential applied to the Ni cathode substrate shifted negatively in the range of–0.6 V to–1.0 V(vs.Ag/AgCl),the surface active sites gradually increased and were more uniformly distributed,while the peak current value gradually increased from less than 0.003μA to 0.004μA.The two-dimensional band nucleation region of activated Nd(Ⅲ)ions on the surface of the Ni cathode in the aqueous system is expanding,meanwhile,the three-dimensional nucleation points are increasing and distributed uniformly.The main mode of nucleation for Nd(Ⅲ)ion reduction is transient nucleation,and the ion diffusion coefficient of Nd(Ⅲ)ion is about 8.57×10^(-9) m^(2)/s.

关 键 词：Nd(Ⅲ)离子 扫描电化学显微分析 计时电流法 产生-收集模式 扩散系数 

分 类 号：TF845[冶金工程—有色金属冶金]