Mixed metal oxide electrode

They are made by coating a substrate, such as pure titanium plate or expanded mesh, with several kinds of metal oxides.

The other metal oxide is typically titanium dioxide which does not conduct or catalyze the reaction, but is cheaper and prevents corrosion of the interior.

The loading or amount of precious metal on the substrate (that is, other than the titanium) can be in the order of around 10 to 12 grams per square metre.

[1] Applications include use as anodes in electrolytic cells for producing free chlorine from saltwater in swimming pools, in electrowinning of metals, in printed circuit board manufacture, electrotinning and zinc electro-galvanising of steel, as anodes for cathodic protection of buried or submerged structures.

Henri Bernard Beer registered his patent on mixed metal oxide electrodes in 1965.