Preparation and electrochemical properties of Pb-PL/AgNPs composite anode
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/cm2,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.
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