Patent ID: 7150931
Filing Date: 2006-12-19
Classification: H01M,Y02E

Abstract:
1. A planar fuel cell stack including at least two planar solid oxide fuel cells each having a layer of solid oxide electrolyte, an anode layer on one side of the electrolyte layer and a cathode layer on the other side of the electrolyte layer, and a gas separator member between the at least two fuel cells, wherein the gas separator member has an anode side and a cathode side and comprises a layer consisting of copper or of copper-based alloy containing at least 50 wt % Cu, a layer of oxidation-resistant material on the cathode side of the copper or copper-based alloy layer and a protective layer on the anode side of the cooper or copper-based alloy layer to prevent Cu vapour escaping from the anode side of the gas separator member at the operating temperature of the stack, wherein the oxidation resistant material of the gas separator member comprises Al 2 O 3 applied to the layer of copper or copper-based alloy as an aluminium coating which is subsequently oxidised, and wherein the aluminium coating is at least partly diffused into a cathode-side surface portion of the layer of copper or copper-based alloy prior to being oxidised.