Preparation and Electrochemical Properties of Soot-Doped Lead-based Composite Anodes
A rapid and low-cost method was used to fabricate carbon nanomaterials-soot particles(CH),and lead/soot(Pb/CH)composite anode materials were prepared by powder metallurgy and mechanical alloying techniques.Oxygen evolution of lead-based anodes was improved due to high specific surface area and catalytic activity of carbon nanomaterials.CH was characterized by field emission scanning electron microscopy(FE-SEM),the Fourier infrared spectroscopy(FTIR),cyclic voltammetry curve(CV)and linear scanning voltammetry curve(LSV).Results show that CH exhibits a shape of many nanosized chains with abundant carbonyl and hydroxyl groups and serve as an excellent transfer carrier of electron and proton.The overpotential of composite anodes decreases with increasing the content of CH in lead/soot materials.The apparent exchange current density of the Pb/1.5wt％CH composite anode is increased by 3 and 2 orders of magnitude compared to that of the pure Pb and conventional Pb/0.75wt％Ag anodes,respectively.The oxygen evolving overpotential of Pb/1.5wt％CH composite anode is lower than that of the Pb/Ag anode and pure Pb anode by 20 and 133 mV,respectively,under the simulated zinc electrow inning conditions,showing excellent electrocatalytic activity of oxygen evolution.
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