Patent ID: 6838205
Filing Date: 2005-01-04
Classification: C25B,H01M,Y02E

Abstract:
1. An electrode structure for use in a unitized hydrogen-oxygen regenerative fuel cell, the electrode structure comprising: an electrocatalyst layer comprising a mixture of at least one electrocatalyst active for the evolution of oxygen, at least one electrocatalyst active for the reduction of oxygen, and a binder, and a gas diffusion backing layer having hydrophobic and hydrophilic region on a continuous conductive matrix, wherein the gas diffusion backing layer is in intimate contact with the electrocatalyst layer, wherein the at least one electrocatalyst active for the evolution of oxygen is a solid solution of iridium oxide and ruthenium oxide, wherein the solid solution comprises between about 5 mol % and about 85 mol % ruthenium oxide with the remainder of the solid solution being iridium oxide.