Electrolyte-electrode assembly comprising an apatite-type oxide electrolyte and method for manufacturing the same
An electrolyte-electrode assembly (MEA) includes: an electrolyte; an anode side electrode and a cathode side electrode formed so as to sandwich the electrolyte via intermediate layers. The anode side electrode has a thickness set to 1 μm, for example. A method for manufacturing the electrolyte-electrode assembly, i.e., the MEA includes a step for forming the anode side electrode by sputtering.
1. An electrolyte-electrode joined assembly comprising an anode and a cathode with an electrolyte interposed therebetween, wherein
the electrolyte comprises an apatite-type oxide in the form of a monocrystal having a face or a direction in which an oxide ion is transferred, or in the form of a polycrystal oriented along a face or a direction in which an oxide ion is transferred, the face or the direction being parallel to the thickness direction,
the anode contains at least electron-conductive metal particles having a particle diameter of less than 50 nm, and oxide-ion-conductive oxide ceramic particles,
the content of the oxide ceramic particles is less than 75 vol %, and
the metal particles are in contact with each other continuously from one surface of the anode that faces the electrolyte to the other surface of the anode.
2. An electrolyte-electrode joined assembly according to claim 1 , wherein the anode has a thickness of less than 10 μm.
3. An electrolyte-electrode joined assembly according to claim 1 , wherein the metal particle is a particle containing one or more of Ni, Co, Pd, Ag, Pt, Zn, and Cu.
4. An electrolyte-electrode joined assembly according to claim 2 , wherein the oxide ceramic particle is a particle containing one or more of perovskite-type compounds, fluorite-type compounds, and apatite-type compounds.
5. An electrolyte-electrode joined assembly according to claim 1 , further comprising an intermediate layer having a thickness of less than 1 μm at least between the cathode and the electrolyte or between the anode and the electrolyte.