Sterilization and elimination of organic micro-impurities from drinkable water and water for surgery-medical use is of utmost importance. The traditional water processing, although quite effective for destruction of bacterial and fungine pollutants, as well as for organic/inorganic chemical impurities, may result relatively ineffective for the elimination of viral components and of residual organic substrates. A solution to these problems can be sought in advanced electrochemical technology, based on electric field and faradaic effects in specifically designed electrochemical cells, readily installed at the consumption sites. This approach has already found practical applications and its further development requires improvement of electrode materials, of the anodes in particular, and of cell engineering. The present brief report concerns the development of new anode materials based on RuO2-IrO2-SnO2 ternary mixtures, deposited on a Ti support. Simpler systems, based on RuO2-SnO2 or IrO2-SnO2, are less suitable either for the poor service life in the first case, or for the cost, in the second. An electrochemical study, aiming at the compositional optimization of RuO2-IrO2-SnO2 ternary mixtures, is therefore of interest. Electrodes have been preliminarily characterized by cyclic voltammetry, in order to obtain indication about their surface morphology and charge-storage capacity. By integration of the J/E(t) plots, voltammetric charges (anodic, qA; cathodic, qC) were obtained, allowing a detailed study of their dependence on the potential-scan-rate (s), important for the assessment of the mechanism of charging. From the total charge storage capacity, an electroactive site (ES) concentration as high as 3.10E17 ES/cm2 was found, at least one order of magnitude higher than for electrode materials prepared by different preparation procedures.

Preparation and characterization of RuO2-IrO2-SnO2 ternary mixtures for advanced electrochemical technology

VAZQUEZ GOMEZ, Lourdes;FERRO, Sergio;URGEGHE, Christian;DE BATTISTI, Achille
2004

Abstract

Sterilization and elimination of organic micro-impurities from drinkable water and water for surgery-medical use is of utmost importance. The traditional water processing, although quite effective for destruction of bacterial and fungine pollutants, as well as for organic/inorganic chemical impurities, may result relatively ineffective for the elimination of viral components and of residual organic substrates. A solution to these problems can be sought in advanced electrochemical technology, based on electric field and faradaic effects in specifically designed electrochemical cells, readily installed at the consumption sites. This approach has already found practical applications and its further development requires improvement of electrode materials, of the anodes in particular, and of cell engineering. The present brief report concerns the development of new anode materials based on RuO2-IrO2-SnO2 ternary mixtures, deposited on a Ti support. Simpler systems, based on RuO2-SnO2 or IrO2-SnO2, are less suitable either for the poor service life in the first case, or for the cost, in the second. An electrochemical study, aiming at the compositional optimization of RuO2-IrO2-SnO2 ternary mixtures, is therefore of interest. Electrodes have been preliminarily characterized by cyclic voltammetry, in order to obtain indication about their surface morphology and charge-storage capacity. By integration of the J/E(t) plots, voltammetric charges (anodic, qA; cathodic, qC) were obtained, allowing a detailed study of their dependence on the potential-scan-rate (s), important for the assessment of the mechanism of charging. From the total charge storage capacity, an electroactive site (ES) concentration as high as 3.10E17 ES/cm2 was found, at least one order of magnitude higher than for electrode materials prepared by different preparation procedures.
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11392/522050
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