High-temperature fuel cell with improved solid-electrolyte/electrode interface and method of producing the interface
AssigneeSiemens Aktiengesellschaft
InventorsWolfram Wersing, Ellen Ivers-Tiffee, Harald Landes, Ruth M anner, Christoph N olscher, Harald Schmidt, Manfred Schn oller
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Abstract
To improve stability and efficiency of a high-temperature solid-electrolyte fuel cell of planar multilayer design, it is proposed to increase the effective interface between the electrolyte layer and an electrode layer. This is achieved by a suitably treated surface of the electrolyte layer or by a porous and/or rough interlayer.
Claims14
A high-temperature solid-electrolyte fuel cell of planar multilayer design having ceramic films formed as gas-transport, electrode and electrolyte layers, comprising:
- an electrolyte layer embedded between first and second electrode layers and having an anode side and a cathode side;
- first and second electronically and ionically conducting interlayers having increased surface located between the electrolyte layer and first and second interlayers, respectively;
- the first interlayer on the anode side being selected from titanium-doped or niobium-doped zirconium oxide and niobium-doped or gadolinium-doped cerium oxide;
- and
- the second interlayer on the cathode side being approximately 1 to 3 .mu.m thick and composed of an ionically and electronically conducting cathode material.
A method of producing a multilayer structure composed of an electrolyte layer, the electrolyte layer having on each side thereof an electrode, which forms an anode layer and cathode layer, respectively, for a planar high-temperature solid-electrolyte fuel cell, comprising the steps of:
- applying a ceramic interlayer, which has an increased surface and which is composed of an ionically and electronically conducting material, to at least one smooth surface of the electrolyte layer;
- applying one of an anode layer and a cathode layer on top of the interlayer;
- jointly sintering the interlayer and the electrode layer;
- selecting an interlayer on the anode side from titanium-doped or niobium-doped zirconium oxide and niobium-doped or gadolinium-doped cerium oxide;
- and
- forming an interlayer on the cathode side from an ionically and electronically conducting cathode material.
A high-temperature solid-electrolyte fuel cell of planar multilayer design having ceramic films formed as gas-transport, electrode and electrolyte layers, comprising:
- an electrolyte layer is embedded between first and second electrode layers and having an anode side and a cathode side;
- at least one electronically and ionically conducting interlayer having increased surface and located between the electrolyte layer and at least one electrode layer of the first and second electrode layers, said interlayer having a peripheral join region that is separated from internal layer regions of said interlayer, the join region serving to receive solder.
Dependencies are inferred from the claim text.