Abstract
The behavior of porous titanium and electrodes based on it, which are activated with Pt, Au, RuO2, Co3O4, and MnO2, in 20-% LiCl solution (pH –0.4 to –0.5) is studied. On porous titanium in the potential ranges 0.1 < E< 0.5 and 0.5 < E< 1.1 V (NHE), the formation of titanium hydrides and passive oxide layers, respectively, is observed; the processes decay with time. In the ranges E< 0.1 and E> 1.1 V, the dissolved oxygen reduction and chlorine evolution, respectively, are observed on porous titanium at high overpotentials. On porous titanium activated with thin-layer Pt, Au, and RuO2coatings, the functional Evs. pH dependence, which is typical for these electrocatalysts, breaks down due to the conjugate reactions of titanium oxidation. On porous titanium activated with Co3O4and MnO2, at pH below unity, chlorine evolution is observed; its rate is limited by the chlorine mass transfer into the bulk solution. Under a gas-diffusion control, the chlorine evolution rate is determined by the diffusion of absorbed hydrogen chloride. The conditions of application of porous titanium as the support for catalytically active electrodes of electrochemical sensors in acidic chloride solutions are considered.
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Chviruk, V.P., Zaverach, E.M. & Linyucheva, O.V. Behavior of Porous Titanium and Catalytically Active Electrodes Based on It in Acidic Chloride Solutions. Russian Journal of Electrochemistry 37, 512–517 (2001). https://doi.org/10.1023/A:1016680221868
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DOI: https://doi.org/10.1023/A:1016680221868