| 摘要 |
An electrolyte layer ( 121 ) and a hydrogen-permeable metal layer ( 122 ) are fitted in a fitting portion ( 131 ) of a low thermal expansion member ( 130 ), and a cathode electrode ( 110 ) is provided on the electrolyte layer ( 121 ). Gas separators ( 100, 150 ) are provided such that a low thermal expansion member ( 130 ) is held between the gas separators ( 100, 150 ). Since the low thermal expansion member ( 130 ) is made of metal which has a thermal expansion coefficient lower than that of the hydrogen-permeable metal layer ( 122 ), thermal expansion of the hydrogen-permeable metal layer ( 122 ) can be suppressed. Accordingly, it is possible to reduce shear stress applied to an interface between the electrolyte layer ( 121 ) and the hydrogen-permeable metal layer ( 122 ) due to the thermal expansion. It is possible to suppress separation of the electrolyte layer ( 121 ) from the hydrogen-permeable metal layer ( 122 ) and occurrence of a crack in the electrolyte layer ( 121 ).
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