Guo Zhongcheng

Preparation and Properties of Al/Pb-Ag-Co Composite Anode Material for Zinc Electrowinning

The Al/Pb-0.3wt%Ag-0.01wt%Co and Al/Pb-0.3wt%Ag composite anode materials were prepared by electrodeposition. The electrochemical properties of the composite anode in 50 g/L Zn2+ and 150 g/L H2SO4 solutions were investigated by anode polarization curves, cyclic voltammetry (CV) curves and Tafel curves. The surface structure was characterized by SEM and EDS. The results show that the cobalt addition can reduce the oxygen evolution potential and improve the corrosion resistance. Compared with cast Pb-0.3wt%Ag, the anodized layer of the Al/Pb-0.3wt%Ag and Al/Pb-0.3wt%Ag-0.01wt%Co are more dense, the grains are finer.

Fabrication and evaluation of polyaniline nanofibers via ethyl cellulose template

The template method for polymerization has high potential for synthesizing polymer nanotubes, nanofibers, and nanobelts because it controls the diameter and length of the material microstructure. In this study, polyaniline (PANI) nanofibers were successfully prepared with ethyl cellulose as the template. The chemical constituents and crystallinity of the PANI nanofiber samples were investigated by Fourier transform infrared spectroscopy and x-ray powder diffraction. Sample morphology was characterized by scanning and transmission electron microscopy. The size uniformity and electrical conductivity of the PANI nanofibers were also determined. The electrical conductivity of the PANI nanofibers reached up to 13.5 S cm−1 at a hydrochloric acid concentration of 1 mol L−1. The PANI nanoparticles had uniform size, and the PANI nanofibers were disordered. The mechanism of ethyl cellulose as a template for synthesizing PANI nanofibers was also analyzed. This study provides a simple method for synthesizing uniform conductive PANI nanofibers.