Reversible solid oxide fuel cell stack and method for preparing same

摘要

A reversible SOFC monolithic stack is provided which comprises: 1) a first component which comprises at least one porous metal containing layer (1) with a combined electrolyte and sealing layer on the porous metal containing layer (1); wherein the at least one porous metal containing layer (1) hosts an electrode; 2) a second component comprising at least one porous metal containing layer (1) with a combined interconnect and sealing layer on the porous metal containing layer; wherein the at least one porous metal containing layers hosts an electrode. Further provided is a method for preparing a reversible solid oxide fuel cell stack. The obtained solid oxide fuel cell stack has improved mechanical stability and high electrical performance, while the process for obtaining same is cost effective.

主权项

1. A method for preparing a reversible monolithic solid oxide fuel cell stack, comprising the steps of:
(a) providing a first component which comprises at least three porous metal containing layers, each layer having a different porosity than the other two layers, wherein the three porous metal containing layers form a porous, graded structure, and wherein the porosity of the first porous metal containing layer is from 20 to 70%, the porosity of the second porous metal containing layer is from 30 to 70%, and the porosity of the third porous metal containing layer is from 30 to 80%; (b) applying an electrolyte layer on at least one porous metal containing layer of the first component; (c) providing a second component comprising at least three porous metal containing layers, each layer having a different porosity than the other two layers, wherein the three porous metal containing layers form a porous, graded structure, and wherein the porosity of the first porous metal containing layer is from 20 to 70%, the porosity of the second porous metal containing layer is from 30 to 70%, and the porosity of the third porous metal containing layer is from 30 to 80%; (d) applying an interconnect layer on the at least three porous metal containing layers of the second component; (e) stacking at least two of said first component and said second component in an alternate order such that the electrolyte layer of the first component contacts the surface of the second component being opposite to the surface of the second component which is covered with the interconnect layer, wherein the at least two of said first component and second component are in an unsintered state; (f) sintering the stack; and (g) forming anodes and cathodes from the most dense of the at least three porous metal containing layers of the first and second components by impregnating the layers with electrode material, wherein the at least three porous metal containing layers of the first and second component comprise a Fe1-x-yCrxMay alloy, wherein Ma is Ni, Ti, Ce, Mn, Mo, W, Co, La, Y or Al, and doped ceria or doped zirconia, and wherein the method comprises a single sintering step.