Research And Preparation Of Low Oxygen Evolution Potential Electrode

Electrodeposition of cobalt as cobalt metal smelting processes mainstream,it will produce chlorine that constitute a great threat for the workshop environment and workers’ health in the production process. Green membrane metal electrowinning production technology is a new technology in the field of hydrometallurgy, the process has three core :(1) Ion-selective membrane(2) Electrodeposition anode(3) Pole film integrated device. The paper do a lot of attempt aiming to make anode of electrodeposition, modified electrochemical properties of existing anode and exploratory process for a new electrode preparation.Analysis the electrode comprising: AC impedance spectroscopy(EIA) analysis, Cyclic voltammetry(CV) analysis, Oxygen evolution polarization curve analysis, Chlorine evolution polarization curve analysis, Life testing experiment and so on.Modified type of the electrode comprising: joined lanthanum into coating solution of the stainless steel substrate lead dioxide electrodes to improve its surface morphology. Enhanced electrochemical properties such as the electrode substrate and coating adhesion, etc; The same for the lead dioxide electrode modification; Joined Cerium that has the effect of catalytically hardening in its plating solution. This modification makes the electrodes chlorine evolution potential and oxygen evolution potential of about 0.4 V while improving, while increasing the life cycle of the electrode.Titanium-based platinum group metal electrode is an electrode that have finished. Do electrochemical performance testing for electrode. AC impedance spectra show Rp values are generally small which can reflect adhesion of electrode substrate and coating. Cyclic voltammetry curves show the electrode surface charge capacity of the platinum group are larg. Chlorine evolution potential and oxygen evolution potential are low that facilitate cell voltage control. From the experimental point of view life, PGMs electrode has more than five years of life, this greatly reduces the cost of frequent replacement of electrodes.Ti /(Sn, Sb) /(Mn, Ce, La) is a modified electrode for traditional tin and antimony intermediate layer of titanium electrodes. Adding rare earth elements to change it`s electrochemical performance. AC impedance spectra show three electrode charge transfer resistance values are similar, there is no much difference between the electrode surface morphology. Cyclic voltammetry curves show three electrodes are no obvious oxidation peak. Polarization curves show three electrodes chlorine evolution potential and oxygen evolution potential reached more than 2.5 V. So it is not suitable as the anode material.Because of the superiority of titanium substrate electrode, In this experiment, Ti /(Sn, Sb) /(Ru, Pb) electrodes were produced, hope to change the way the metal crystal lattice type and coat framework by changing the sintering temperature and brushing brushing layer, thermally decomposed respectively at 300,400,500 ℃, each temperature gradient is divided into three different intermediate layer and the active layer brushing ratio. Experimental results show that the electrochemical performance of electrode at 400 ℃ 500 ℃ are preferably: Low-frequency region of AC impedance curve shows titanium substrate and coating adhesion strong; CV curve shows the higher proportion of the active layer, the lower oxidation peak potential, the more likely the oxygen evolution reaction; Such electrode polarization curve analysis shows that chlorine evolution potential and oxygen evolution potential has reached 1.2 V or less, extremely beneficial for cell voltage control; Life after the titanium-based platinum group metal electrode, suitable as anode material in production.