Pb-PL/AgNPs复合阳极的制备及电化学性能  

Preparation and electrochemical properties of Pb-PL/AgNPs composite anode

作　　者：尹云龙 杨长江[1] 李灿 仇强 张利华[1,2] YIN Yunlong;YANG Changjiang;LI Can;QIU Qiang;ZHANG Lihua(Faculty of Metallurgical and Energy Engineering,Kunming University of Science and Technology,Kunming 650093,China;Key Laboratory of Unconventional Metallurgy,Ministry of Education,Kunming 650093,China)

机构地区：[1]昆明理工大学冶金与能源工程学院,昆明650093 [2]昆明理工大学非常规冶金教育部重点实验室,昆明650093

出　　处：《中国有色金属学报》2024年第11期3643-3656,共14页The Chinese Journal of Nonferrous Metals

基　　金：国家自然科学基金资助项目(52164040);昆明理工大学分析与测试基金资助项目(2022M20212202131,2023M20222202126)。

摘　　要：Pb-Ag阳极是锌电积中目前最常用的不溶性阳极,但其存在析氧电位高和耐腐蚀性差等问题。本文通过木质素磷酸化改性并在其表面负载纳米银颗粒,制备了磷酸化木质素/纳米银复合材料(PL/AgNPs),采用场发射扫描电子显微镜(FESEM)、傅立叶变换红外光谱法(FTIR)、X射线光电子能谱测试(XPS)、热重分析(TGA)对PL/AgNPs的微观形貌、结构组成、银含量进行分析。采用粉末冶金和机械合金化技术制备出Pb-PL/AgNPs复合阳极,在模拟锌电积条件下,采用循环伏安法(CV)、线性扫描伏安法(LSV)、电化学阻抗谱分析法(EIS)等对Pb-PL/AgNPs复合阳极的电化学性能和耐腐蚀性能进行分析。结果表明:Pb-0.5%PL/AgNPs复合阳极具有最佳的电化学和耐腐蚀性能,其银的用量较Pb-0.75%Ag阳极减少了96.7%。Pb-0.5%PL/AgNPs复合阳极的伏安电荷量为1.0611 C/cm^(2),分别是纯Pb阳极和Pb-Ag阳极的1.8倍和1.25倍;其析氧稳态电位为1.436 V,比纯Pb阳极和Pb-Ag阳极分别低194 mV和97 mV;其耐腐蚀性比纯Pb阳极和Pb-Ag阳极分别提升约86.8%和84%。At present,Pb-Ag anodes are the most commonly utilized insoluble anodes in zinc electrowinning.However,they exist problems such as high oxygen evolution potential and poor corrosion resistance.In this paper,PL/AgNPs were prepared by phosphorylation modification of lignin and loading silver nanoparticles on its surface.FESEM,FTIR,XPS,and TGA were used to analyze the micro-morphology,structural composition,and silver content of PL/AgNPs.The Pb-PL/AgNPs composite anodes were prepared using powder metallurgy and mechanical alloying techniques.The electrochemical properties and corrosion resistance of Pb-PL/AgNPs composite anodes were analyzed using CV,LSV,and EIS.The results show that Pb-0.5%PL/AgNPs composite anode has the best electrochemical and corrosion resistance properties,its dosage of silver is 96.7%less than that of Pb-0.75%Ag anode.The Pb-0.5%PL/AgNPs composite anode exhibits a voltammetric charge of 1.0611 C/cm^(2),which is 1.8 times as that of the pure Pb anode and 1.25 times as that of the Pb-Ag anode.Its oxygen evolution potential is 1.436 V,which is 194 mV and 97 mV lower than those of pure Pb anode Pb-Ag anode,respectively.Its corrosion resistance is improved by approximately 86.8%and 84%more than those of pure Pb anode and Pb-Ag anode,respectively.

关 键 词：铅基阳极 析氧反应 磷酸化木质素 纳米银颗粒 

分 类 号：TB333[一般工业技术—材料科学与工程]