Influence of F-Doped β-PbO₂Conductive Ceramic Layer on the Anodic Behavior of 3D Al/Sn Rod Pb−0.75%Ag for Zinc Electrowinning

Abstract

In this study, a 3D Al/Sn rod Pb−0.75%Ag anode was prepared by continuous extrusion coating technique, and a conductive ceramic layer was formed by anodic oxidation in a fluoride-containing H 2 SO 4 solution. The phase composition and surface microstructure of the oxide layer were examined by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM) and energy dispersive spectrometer (EDS), indicating the presence of F-doped β-PbO 2 ceramic layer. The electrocatalytic characteristics and electrochemical stability of the anodes were explored by cyclic voltammetry, anodic polarization curves, electrochemical impedance spectroscopy (EIS) and the accelerated life test in the zinc electrolyte. It was found that the F-doped β-PbO 2 layer has good electrocatalytic activity and corrosion resistance. The fence-like 3D Al/Sn rod Pb−0.75%Ag/F-doped β-PbO 2 anode plate was continuously used in the zinc electrolyte for 15 days; in addition, it was found that compared to the traditional Pb-0.75%Ag anode plate, the ultimate tensile strength improved by about 31.45%, the average cell voltage decreased by 53 mV, and the output of zinc increased by 3.09%, confirming its feasibility in practical applications for zinc EW.

Effect of a Synthesized Pulsed Electrodeposited Ti/PbO2–RuO2 Nanocomposite on Zinc Electrowinning

“…As shown in Figure , the potential of the anode does not alter during the process (3 h) at 0.045 A cm –2 ; thus, the stability of the composite anodes is suitable during the zinc electrowinning process. Figure also shows that PbO 2 –RuO 2 composite anodes have excellent stability without fluctuations during 3 h in the zinc electrowinning process compared to previous investigation, which reported the anodes with good stability and fluctuations during approximately the same time. To confirm this result, 50 voltammetry cycles were carried out.…”

“…Figure b shows the single-loop equivalent circuit to model the OER, in which R s is the electrolyte resistance and R ct is the charge transfer resistance for the OER process. Other researchers reported the single-loop Nyquist plots, and this circuit was also observed for the OER on the PbO 2 and RuO 2 surface. ,− The impedance parameters along with the admittance Y 0 and power of the related CPE (semi capacitor), n , were obtained for pure micro PbO 2 , PbO 2 –RuO 2 microcomposite, and nano-mixed composite anode catalysts by fitting the analyzed data using ZView software. The fitted parameters are given in Table .…”

AuOx Surface Oxide Layer as a Hole-Transferring Cocatalyst for Water Oxidation over Au Nanoparticle-Decorated TiO2 Photocatalysts

“…The signal of Pb was observed, and the position of the peak was the same as that of the peak due to Au. XPS analysis of Au/TiO 2 (O 2 , 823) after the reaction revealed that the oxidation state of Pb is +4 as shown in Figure S12, indicating that the Pb species forming on Au particles is PbO 2 . The sample showed no diffraction peaks assignable to Pb species in an X-ray diffraction analysis, indicating that the thickness of the PbO 2 layer is very thin.…”

A Comparative Study of Lead Alloy Electrode and CF/β-PbO2 Electrode for Zinc Electrowinning

“…The auxiliary electrode is made of platinum plate. 13,14 The surface and interfacial morphology were observed using a XL30 ESEM (Philips, Holland). A four-probe method was used to test the resistivity.…”