摘要 |
The present invention provides a material suitable for use in a solid oxide fuel cell, wherein the material is of an, optionally doped, double perovskit e oxide material having the general formula (I): (LnaXb) e (Z1cZ2d) fOg (I) wherein Ln is selected from Y, La and a Lanthanide series element, or a combination of these and X also represents an element occupying the A site o f a perovskite oxide and is selected from Sr, Ca and Ba, and Z1and Z2 represen t different elements occupying the B site of a perovskite oxide and are select ed from Cr, Mn, Mg and Fe, and wherein a has a value from 0 to 1, preferably, 0 .7 to 1.0, b has a value of from 1 to 0, preferably 0.3 to 0, and each of c and d has a value of from 0.25 to 0.75, provided that a + b has a value of 1, and c + d, has a value of 1, and wherein e has a value of from 0.8 to 1, wherein f has a value of from 0.8 to 1, and g has a value of from 2.5 to 3.2. Also provided are SOFCs having an electrode or functional layer of a material or containing a material of the invention, as well as mixed ionic/electronic conducting membranes suitable for use in a syngas reactor or oxygen separato r, comprising a layer of a double perovskite material of the invention, and a method of oxidising a fuel in an SOFC having an anode of a double perovskite materialof the invention. |