Polycrystalline metal oxides, proton-conducting solid electrolytes, electrolyte layers, and electrochemical devices

Abstract

This invention provides a material that possesses proton conductivity and has improved relative density. [Solution] Polycrystalline metal oxides have the general formula Ba i Sc j M1 k M2 l O 3-δ It is represented as follows: the atoms of M1 are composed of at least one of W (tungsten) and Mo (molybdenum), the atoms of M2 are composed of at least one of Cu (copper) and Ni (nickel), l / i > 0.01, and i + j + k + l = 2.

Claims

1. Polycrystalline metal oxide, The general formula is Ba i Sc j M1 k M2 l O 3-δ Represented as such, the atoms of M1 are composed of at least one of W (tungsten) and Mo (molybdenum), and the atoms of M2 are composed of at least one of Cu (copper) and Ni (nickel), satisfying the following formulas (1) and (2): A polycrystalline metal oxide characterized by the following features. l / i>0.01...(1) i+j+k+l=2...(2)

2. A polycrystalline metal oxide according to claim 1, The following equation (3) is satisfied: A polycrystalline metal oxide characterized by the following features. 0.01<l / i≦0.05...(3)

3. The polycrystalline metal oxide according to claim 2 The atoms in M2 are composed solely of Ni. A polycrystalline metal oxide characterized by the following features.

4. A proton-conducting solid electrolyte, A polycrystalline metal oxide according to any one of claims 1 to 3 is used in a fuel cell, a steam electrolytic cell, a sensor, an electrolyte, or an electrode. A proton-conducting solid electrolyte characterized by the following features.

5. It is an electrolyte layer, The polycrystalline metal oxide described in any one of claims 1 to 3 is included. An electrolyte layer characterized by the following features.

6. It is an electrochemical device, The electrolyte layer is provided according to claim 5, An electrochemical device characterized by the following features.

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