A SOLID OXIDE FUEL CELL

摘要

A solid oxide fuel cell ( 10 ) comprises an anode electrode ( 12 ), a cathode electrode ( 14 ) and an electrolyte ( 16 ) between the anode electrode ( 12 ) and the cathode electrode ( 14 ). A gaseous fuel is supplied to an anode chamber ( 18 ) partially defined by the anode electrode ( 12 ) and a gaseous oxidant is supplied to a cathode chamber ( 20 ) partially defined by the cathode electrode ( 14 ). The electrolyte ( 16 ) comprises a first dense non-porous layer ( 22 ), a second porous layer ( 24 ) on the first dense non-porous layer ( 22 ) and a third dense non-porous layer ( 26 ) on the second porous layer ( 24 ). The anode electrode ( 12 ) is arranged on the first dense non-porous layer ( 22 ) and the cathode electrode ( 14 ) is arranged on the third dense non-porous layer ( 26 ). The second porous layer ( 24 ) acts as a buffer between the first dense non-porous layer ( 22 ) and the third dense non-porous layer ( 26 ) to prevent defects propagating between the layers ( 22,26 ) and to prevent fuel and oxidant leaking through the electrolyte ( 16 ).