GAS ELECTRODE, METHOD FOR MAKING THE SAME AND USES THEREOF

文件类型：PDF文档
文件大小：763K
Gas electrode comprises multiple layers (2, 3, 4) allowing the passage of reactive species through the electrode layers stacked on each other on a solid substrate (1) such as a solid electrolyte and comprising a first layer in contact with the solid substrate and a last layer having a free outer surface intended to be placed in contact with a gas, each of these layers are made up of mixed oxide. Gas electrode comprises multiple layers (2, 3, 4) allowing the passage of reactive species through the electrode layers stacked on each other on a solid substrate (1) such as a solid electrolyte and comprising a first layer in contact with the solid substrate and a last layer having a free outer surface intended to be placed in contact with a gas, each of these layers are made up of mixed oxide. The layers are constituted of a mixed oxide, comprising Ruddlesden-Popper phase and perovskites, of formula L n + 1 - xNi n - yM yO(3n+1+- s) (I). The microstructure of the first layer is different from the microstructure of the last layer. The porosity of different layers increases from the first layer of which the porosity is very low until the last layer of which the porosity is very high. The different layers stacked on each other form a network of solid material interconnected between the external free surface of the last layer and the solid substrate, having a total thickness greater than 1 mu m. L : rare earths element, preferably La, Pr, Nd, Sm, Eu, Er or Gd; Ni : nickel; M : transition metal, preferably Fe, Co or Mn; n : non-zero integer; and x, y, s : real numbers i.e. 0= x less than n+1, 0= y less than n and 0= s= 0.25. Independent claims are included for : (1) the preparation of the gas electrode by stacking the multiple layers on top of each other on the solid substrate i.e. the solid electrolyte, according to the given criteria; (2) electrochemical cell comprising the gas electrode; and (3) electrochemical fuel cell, comprising a solid electrolyte carrying a cathode made of the gas electrode.