Electrode for hydrogen generation and process for preparation thereof
View Patent ↗An electrode for hydrogen generation can maintain a low hydrogen overvoltage for a long period of time even when electrolysis is conducted there not only with a low current density but also with a high current density. The electrode for hydrogen generation has a coating layer formed on a conductive base member by applying a material not containing any chlorine atom prepared by dissolving lanthanum carboxylate in a nitric acid solution of ruthenium nitrate and thermally decomposing the material in an oxygen-containing atmosphere.
1. An electrode for hydrogen generation comprising a coating layer on a conductive base member, said coating layer formed by thermally decomposing at temperature from 400° C. to 600° C. in an oxygen-containing atmosphere a material not containing any chlorine atom prepared by dissolving lanthanum carboxylate in a nitric acid solution of ruthenium nitrate.
2. The electrode for hydrogen generation according to claim 1 , wherein the Ru/La atom ratio of the material of the applied solution is between 30/70 and 90/10.
3. The electrode for hydrogen generation according to claim 1 , wherein the carboxylate is at least one selected from a group including lanthanum acetate, lanthanum formate and lanthanum oxalate.
4. The electrode for hydrogen generation according to claim 1 , wherein the applied material contains at least a platinum compound not containing any chlorine atom and the Pt/La atom ratio therein is equal to or greater than 0.005.
5. The electrode for hydrogen generation according to claim 4 , wherein the platinum compound is at least either dinitrodiammine platinum or hexahydroxo platinate.
6. An electrode for hydrogen generation having a coating layer containing atoms of ruthenium, lanthanum, oxygen and carbon, formed by thermally decomposing at temperature from 400° C. to 600° C. in an oxygen-containing atmosphere a material not containing any chlorine atom prepared by dissolving lanthanum carboxylate in a nitric acid solution of ruthenium nitrate and applied onto a conductive base member.