Abstract
Among the numerous base metals tested for DSA® type electrodes (e.g., titanium and its alloys, zirconium, niobium etc.), tantalum is a potentially excellent substrate owing to its good electrical conductivity and corrosion resistance, and the favourable dielectric properties of its oxide. Nevertheless, a DSA® type electrode fabricated on a tantalum substrate would be very expensive due to the high cost of the metal. To prepare an anode combining the excellent properties of tantalum at reasonable price, a new material has been developed in our laboratory. This consists of a common base metal (e.g., Cu) covered with a thin tantalum coating. This tantalum layer was obtained by molten salt electroplating in a LiF–NaF–K2TaF7 melt at 800°C. Thus, an anode of the type Metal/Ta/Ta2O5–IrO2 with a surface load of 22gm-2 IrO2, submitted to the severe test conditions used in this work, exhibits a standardized lifetime tenfold greater than one made with ASTM grade 4 titanium base metal. Thus, this type of electrode might be advantageously employed as an oxygen evolution anode in acidic solutions.
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References
S. Trasatti and G. Lodi, Oxygen and chlorine evolution at conductive metallic oxide anodes, in S. Trasatti (Ed.), ‘Electrode of Conductive Metallic Oxides’, Part. B, Elsevier, Amsterdam (1981), Chapter 10, pp. 521–626.
J. Rolewicz, Ch. Comninellis, E. Plattner and J. Hinden, Electrochim. Acta 33 (1988) 573–80.
S. Trasatti and G. Lodi, Properties of conductive transition metal oxides with rutile-type structure, in S. Trasatti (Ed.), ‘op cit.’ Part A, Chapter 7, pp. 301–58.
F. G. Fox, Corros. Prevent. Control 5 (1958) 44–8.
J. Rolewicz, Ch. Comninellis, E. Plattner and J. Hinden, Chimia 42 (1988) 75–9.
I. F. Danzig, R. M. Dempsey, and A. B. La Conti, Corrosion 27 (1971) 55–62.
F. Cardarelli, P. Taxil and A. Savall, Int. J. Refract. Metals & Hard Mater. 14 (1996) 365–81.
P. Taxil, PhD thesis, Toulouse, France (1986).
P. Taxil and J. Mahenc, J. Appl. Electrochem. 17 (1987) 261–9.
P. Taxil, J. Less Common Metals 113 (1985) 89–101.
Ch. Comninellis and G. P. Vercesi, J. Appl. Electrochem. 21 (1991) 335–45.
R. Mraz and J. Krysa, ibid. 24 (1994) 1262–6.
G. P. Vercesi, J. Rolewicz and Ch. Comninellis, Thermochim. Acta 176 (1991) 31–47.
Ch. Comninellis and G. P. Vercesi, J. Appl. Electrochem. 21 (1991) 136–42.
J. Krysa, L. Kule, R. Mraz and I. Roušar, ibid. 26 (1996) 999–1005.
Standard NACE TM–01-69, Mater. Prot. (May 1969), pp. 13-24.
American Society of Metals, ‘ASM Handbook of Metals’, Vol. 5, ‘Surface Engineering’, ASM Books, Metals Park, OH. (1994), p. 1056.
American Society for Testing and Materials (ASTM)-Society for Automotive Engineers (SAE), ‘Metals and Alloys in the Unified Numbering System’, 6th. edn, Society for Automotive Engineers, Warrendale (1993), pp. 235–69.
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Cardarelli, F., Taxil, P., Savall, A. et al. Preparation of oxygen evolving electrodes with long service life under extreme conditions. Journal of Applied Electrochemistry 28, 245–250 (1998). https://doi.org/10.1023/A:1003251329958
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DOI: https://doi.org/10.1023/A:1003251329958