Preparation of oxygen
evolving electrodes
with long service life under extreme conditions
François Cardarelli*, Pierre Taxil, André Savall,
Christos Comninellis, Georgia Manoli and Olivier Leclerc
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 22 g.m-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.
Journal
of Applied Electrochemistry
Volume 28, Number 3, March 1998, Pages 245-250 [Full
text PDF file (584 KB)]
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Keywords: maths,
physics,
mechanics, quantum
mechanics,
relativity, electricity,
electrostatic, electromagnetism,
magnetism, thermodynamics, acoustics,
optics,
chemistry,
general chemistry, inorganic chemistry, organic chemistry, analytical
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surface chemistry,
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materials engineering, materials science, materials data, properties of
materials
properties, aqueous electrolytes, electrolysis, electrodics, electrode
kinetics, corrosion science, electrodeposition, electrowinning,
electrorefining, electrocatalysis,
electrodes,
inert anode, dimensionally stable anodes (DSA®), chlorine
evolution, ruthenium
dioxide (RuO2),
DSA-Cl2,
DSA-RuO2,
oxygen evolution, iridium dioxide (IrO2),
DSA-O2,
DSA-IrO2,
mixed metal oxides (MMO), activated
titanium anodes, oxide coated titanium
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