Electrode for electrochemical processes and method for producing the same
A method of producing an electrode by applying a solution of a non-stoichiometric compound of the formula Sn(OH) 2+x Cl 2−x .nH 2 O followed by a thermal treatment and the electrodes produced by the said method.
1. A method for the manufacturing of an electrode, comprising applying a solution of a precursor for the pyrolytic formation of a tin-containing coating to a substrate of a valve metal, followed by the execution of a thermal treatment, wherein the precursor solution comprises a stannic hydroxychloride species selected from a non-stoichiometric compound expressed by the formula Sn(OH) 2+x Cl 2−x nH 2 O and a compound expressed by the formula SnO(H 2 O) n R 2−x Cl x′ R being an organic substituent.
2. The method of claim 1 wherein the Cl:Sn molar ratio is between 1 and 1.9.
3. The method of claim 1 wherein R is (CH 3 COO—).
4. The method of claim 1 further comprising a precursor of at least one noble metal.
5. The method of claim 4 wherein said precursor of at least one noble metal is a chlorinated precursor of iridium or ruthenium.
6. The method of claim 5 wherein said chlorinated precursor of iridium is H 2 IrCl 8 .
7. The method of claim 1 wherein the valve metal is titanium or titanium alloy with a ceramic pre-layer.
8. The method of claim 7 wherein the ceramic pre-layer comprises titanium dioxide.
9. The method of claim 1 wherein said application of the solution is effected in multiple coats, each followed by a thermal treatment.
10. The method of claim 1 wherein said thermal treatment is a pyrolysis at a temperature between 350 and 800° C., preceded by a drying at a temperature between 80 and 200° C.
11. The method of claim 1 wherein the metal is titanium or titanium alloy.
12. The method of claim 1 wherein said thermal treatment is a pyrolysis at a temperature between 350 and 800° C.