Prepared by pulsed electrodeposition Ti-based the lead composite electrode material and performance
|School||Kunming University of Science and Technology|
|Keywords||Pulsed electrodeposition The composite electrode of Pb-WC-PANI Titanium-based Anode material Lead Performance|
Present in the zinc electrowinning industry the most widely used anode material is lead-based alloy anode, but a high oxygen evolution potential of such electrode exists, high cell voltage and low current efficiency and the mechanical strength is low. Based on the above problems, the present thesis titanium metal matrix, the tartrate - tungsten carbide (WC) - polyaniline (PANI) in the bath system, prepared by the method of pulse electrodeposition a new kind of Ti / Pb-WC -PANI composite electrode. The study prepared by pulsed electrodeposition process of Ti / Pb-WC-PANI composite electrode were investigated by examining the pulse electric deposition process conditions and solid particles added amount of Ti / Pb-WC-PANI composite electrode performance, determine the best plating process, PANI: 15g / l, WC: 30g / l, pulse conduction time: 0.3ms, pulse cycle: 1.5ms, the average current density: 3 A DM-2, temperature: 25 ° C. Under this condition, the composite electrode kinetic parameters of the oxygen evolution: a = 0.844, b = 0.274, i0 = 8.32 × 10-4. By linear sweep voltammetry, cyclic voltammetry, Tafel curves and EIS electrochemical test, comparing the pulse Ti / Pb-WC-PANI composite electrode, DC Ti / Pb-WC-PANI composite electrode lead-silver alloy pure lead electrode oxygen evolution potential, electric catalytic activity, corrosion resistance and electrical conductivity obtained pulse Ti / Pb-WC-PANI composite electrode performance are better than the other three anode materials. Electrode surface morphology, composition and phase composition characterized by means of SEM, XRD and infrared spectroscopy. SEM analysis showed that pure lead electrodes crystalline granular pores and pores between the grains, the unit cell prominent, uneven surface; DC Ti / Pb-WC-PANI composite electrode non-porous, combined with close between the crystals obvious edge interface; Ti / Pb-WC-PANI composite electrode crystals under pulsed conditions showed a polyhedron massive, crystal compact and uniform, did not find a clear crystal boundary. The infrared spectroscopic analysis showed that compared with the polyaniline infrared absorption spectrum, Ti / Pb-WC-PANI composite electrode appears polyaniline has characteristic peaks in the composite electrode of PANI exist. XRD analysis showed that the composite electrode in addition to metallic lead WC, and plating plated crystalline structure. Diffraction peaks appear in the XRD pattern of each of the composite electrode is not polyaniline. Two composite coating and compared to the diffraction peaks of pure lead plating, Ti / Pb-WC-PANT diffraction peak intensity of the composite electrode has been significantly weakened; pulse weaker than the intensity of diffraction peaks of the Ti / Pb-WC-PANI composite electrode under DC conditions The obtained Ti / Pb-WC-PANT composite electrode diffraction peak intensity. Finally, this study also tested the composite electrode material obtained under the optimum conditions in the application of the zinc electrowinning cell voltage, current efficiency and enhanced life, to draw each of the application were superior to the conventional lead-based alloy electrode.