The simultaneous anodic oxidation of Pb2+ and Co2+ in a sulphamate bath containing suspended Co3O4 (or NiCo2O4) particles has been studied as a method for preparing composite oxides in which the particles are dispersed in a matrix consisting of PbO2 and hydrous Co oxides, CoOx with x<2. The (PbO2+CoOx)+Co3O4 composites thus prepared are very rough and their Co concentration, expressed as XCo=NCo/(NCo+NPb), where N represents the number of atoms, approaches 0.5. As a result, they are more active catalysts in the oxygen evolution reaction than either PbO2+CoOx or PbO2+Co3O4 prepared in the past by our group. For samples prepared in the presence of particles, the potential required to evolve oxygen at a fixed current density varies roughly linearly with XCo, irrespective of the fact that Co is present as Co3O4 or CoOx.
Preparation of anodes for oxygen evolution by electrodeposition of composite Pb and Co oxides.
Cattarin S;Guerriero P;Musiani M
2001
Abstract
The simultaneous anodic oxidation of Pb2+ and Co2+ in a sulphamate bath containing suspended Co3O4 (or NiCo2O4) particles has been studied as a method for preparing composite oxides in which the particles are dispersed in a matrix consisting of PbO2 and hydrous Co oxides, CoOx with x<2. The (PbO2+CoOx)+Co3O4 composites thus prepared are very rough and their Co concentration, expressed as XCo=NCo/(NCo+NPb), where N represents the number of atoms, approaches 0.5. As a result, they are more active catalysts in the oxygen evolution reaction than either PbO2+CoOx or PbO2+Co3O4 prepared in the past by our group. For samples prepared in the presence of particles, the potential required to evolve oxygen at a fixed current density varies roughly linearly with XCo, irrespective of the fact that Co is present as Co3O4 or CoOx.File | Dimensione | Formato | |
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