| 摘要 |
An electrochemical device is described which has an oxygen electrode which contains a pyrochlore type electrocatalyst material. This electrocatalystmaterial is one or more electrically conductive pyrochlore compounds selected from the compounds of the following formula: A2B2O7-y (1) wherein A is any of the known pyrochlore structure metal cations, B is a pyrochlore structure metal cation at least a major portion of which is selected from the group consisting of one or more of Ru, Rh, Ir, Os, Pt, Ru-Pb mixtures and Ir-Pb mixtures, and wherein 0 y 1.0. Desirably, A is a pyrochlore structure metal cation at least a major portion of which is selected from the group consisting of one or more of Pb, Bi and Tl. A preferred group of pyrochlore compounds which are included in the above formula are those having the following formula: Pb2¢M2-xPbx!O7-y (2) wherein M is selected from the group consisting of Ru and Ir, wherein 0 x 1.2 and 0 y 1.0. |
