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.
作者
尹云龙
杨长江
李灿
仇强
张利华
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)
出处
《中国有色金属学报》
EI
CAS
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)。
关键词
铅基阳极
析氧反应
磷酸化木质素
纳米银颗粒
lead-based anode
oxygen evolution
phosphorylated lignin
nano silver particle
