Abstract: The invention relates to an oxide material of general formula (I) A2?x?yA?XA?yM1?z M?Z04+?, wherein A and A? are independently a metal cation of a group formed by lanthanides and/or alkalis and/or alkaline earths, A? is a cationic gap, i.e. a cation vacancy A and/or A?, M and M? are independently a metal of a group formed by transition metals such as 0<y<0.30, preferably 0<y=0.20; 0<?<0.25, preferably 0<?<0.10; 0=x=1; and 0=z=1. An air electrode containing said material and an electric power producing device in the form of a fuel cell provided with at least one electrochemical cell comprising said electrode are also disclosed.

Abstract: The invention relates to a method for water electrolysis consisting in using an electrode containing at least one type of oxide material of general formula A2?x?yA?xA?yM1?zM?zO4+?, wherein A is a lanthanide and/or alkaline and/or alkaline earth metal cation, A? is at least one lanthanide and/or alkaline and/or alkaline earth metal cation, A? is a cation gap, M is a transition metal element, M? is at least one type of transition metal element, wherein said metal is such that 0<y<0.30, preferably 0<y?0.20; ?0 1??<0 25, preferably 0??<0.

Abstract: Method of preparing a metal oxide layer on a substrate, in which the following successive steps are carried out: a) a metal oxide powder is dispersed in a liquid medium comprising a dispersion solvent and a dispersant, the said liquid medium containing neither plasticizer nor binder, by means of which a suspension A of the said metal oxide powder in the said liquid medium is obtained; b) a solution of at least one polymer in a solvent is added to the said suspension A, by means of which a suspension B is obtained; c) suspension B is deposited on the substrate by a dip coating method, by means of which a green layer is obtained; d) the green layer obtained in step c) is dried; and e) the dried layer obtained in step d) is calcined.