Solid oxide fuel cell and method for producing electrolyte layer-anode assembly

Patent metadata

Field	Value
Publication number	US-10505196-B2
Application number	US-201615742939-A
Country	US
Kind code	B2
Filing date	Jul 15, 2016
Priority date	Jul 17, 2015
Publication date	Dec 10, 2019
Grant date	Dec 10, 2019

Abstract

In an SOFC, a solid electrolyte layer and an anode are integrated with each other to provide an electrolyte layer-anode assembly. The anode contains a nickel element and a first proton conductor. The first proton conductor is composed of a first perovskite oxide having proton conductivity. The first perovskite oxide has an AXO3-type crystal structure, the A-site containing Ba, the X-site containing Y and at least one selected from the group consisting of Zr and Ce. The nickel element is at least partially in the form of NiO. The anode has a porosity Pa of 10% or more by volume when INi/INiO≤0.1, where INi/INiO denotes a relative intensity ratio of the peak intensity INi of metallic Ni to the peak intensity INiO of the NiO in an XRD spectrum of the anode.

First claim

The invention claimed is:

1. A solid oxide fuel cell comprising a cell structure including a cathode, an anode, a protonically conductive solid electrolyte layer provided between the cathode and the anode, an oxidant channel to supply an oxidant to the cathode, and a fuel channel to supply a fuel to the anode,
wherein the solid electrolyte layer and the anode are integrated with each other to provide an electrolyte layer-anode assembly,
the anode contains a nickel element and a first proton conductor,
the first proton conductor is composed of a first perovskite oxide having proton conductivity,
the first perovskite oxide has an AXO 3 -type crystal structure, an A-site containing Ba, an X-site containing Y and at least one selected from the group consisting of Zr and Ce,
the nickel element is at least partially in the form of NiO,
the anode has a porosity P a of 10% or more by volume when I Ni /I NiO ≤0.1, where I Ni /I NiO denotes a relative intensity ratio of a peak intensity I Ni of metallic Ni to a peak intensity I NiO of the NiO in an X-ray diffraction spectrum of the anode, and
the solid electrolyte layer has a porosity P s of 0.5% or less by volume.

2. The solid oxide fuel cell according to claim 1 , wherein the porosity P a is 10% by volume to 25% by volume.

3. The solid oxide fuel cell according to claim 1 , wherein the solid electrolyte layer contains a second proton conductor,
the second proton conductor is composed of a second perovskite oxide having proton conductivity,
the second perovskite oxide has an AXO 3 -type crystal structure, an A-site containing Ba, an X-site containing Y and at least one selected from the group consisting of Zr and Ce.

4. The solid oxide fuel cell according to claim 1 , wherein the electrolyte layer-anode assembly further includes an intermediate layer provided between the solid electrolyte layer and the anode,
the intermediate layer contains a nickel element and a third proton conductor, and
the intermediate layer has a porosity P i lower than the porosity P a .

5. The solid oxide fuel cell according to claim 4 , wherein the porosity P i is 5% or less by volume.

6. The solid oxide fuel cell according to claim 4 , Wherein the third proton conductor is composed of a third perovskite oxide having proton conductivity, and
the third proton conductor has an AXO 3 -type crystal structure, an A-site containing Ba, an X-site containing Y and at least one selected from the group consisting of Zr and Ce.

Assignees

• Sumitomo Electric Industries

Inventors

• Mizuhara Naho
• Majima Masatoshi
• Tawarayama Hiromasa
• Hiraiwa Chihiro
• Higashino Takahiro
• Noda Yohei
• Miyamoto Kazunari

Classifications

• H01M2008/1293

  Fuel cells with solid oxide electrolytes · CPC title

• H01M8/1213

  characterised by the electrode/electrolyte combination or the supporting material · CPC title

• H01M8/1246

  the electrolyte consisting of oxides · CPC title

• H01M4/86

  Inert electrodes with catalytic activity, e.g. for fuel cells · CPC title

• H01M4/9033

  Complex oxides, optionally doped, of the type M1MeO3, M1 being an alkaline earth metal or a rare earth, Me being a metal, e.g. perovskites · CPC title