Method for fabricating an array of electrode and electrolyte materials for use in solid oxide fuel cells
View Patent ↗The present invention provides high-throughput systems and methods for the fabrication and evaluation of electrode and electrolyte materials for solid oxide fuel cells. The present invention includes systems and methods for synthesizing and optimizing the performance of electrodes and electrode-electrolyte combinations and utilizes small-scale techniques to perform such optimization based on chemical composition and variable processing. Advantageously, rapid device performance systems and methods coupled with structural and surface systems and methods allow for an increased discovery rate of new materials for solid oxide fuel cells.
1. A method for the fabrication of an array of electrode or electrolyte materials suitable for use in a solid oxide fuel cell, the method comprising the steps of:
providing a non-sintered or partially-sintered substrate;
infiltrating a porous layer disposed on a substrate by delivering one or more materials to a plurality of regions of the substrate, wherein the one or more materials create a plurality of regions of differing chemical composition within the substrate, wherein the plurality of regions of differing chemical composition form the array; and
sintering the substrate.
2. The method of claim 1 , wherein the substrate comprises a substrate selected from the group consisting of a green ceramic and a green polymer.
3. The method of claim 1 , wherein using capillary forces to deliver the one or more materials to the plurality of regions of the substrate comprises using a vacuum-assisted draw to create a plurality of regions of discrete, homogenous chemical composition.
4. The method of claim 1 , further comprising distributing a chemical species into the substrate, wherein the chemical species alters a physical or chemical property of each of the plurality of regions of differing chemical composition when sintered.
5. The method of claim 4 , wherein distributing the chemical species into the substrate comprises distributing a chemical species selected from the group consisting of metal ions, metal cations, a combination of metal ions, and a combination of metal cations into the substrate.
6. The method of claim 4 , wherein the physical property of each of the plurality of regions of differing chemical composition altered by the chemical species comprises a physical property selected from the group consisting of electrical conductivity, ionic conductivity, pore size, and pore density.
7. The method of claim 1 , wherein the porous layer has a thickness between about 10 microns and about 1,000 microns.
8. The method of claim 1 , further comprising testing each of the plurality of regions of differing chemical composition for conductivity and catalytic activity in the presence of oxygen by monitoring overpotential at a plurality of predetermined temperatures using a multi-probe instrument.
9. The method of claim 8 , further comprising ranking the chemical composition and processing conditions of each of the plurality of regions of differing chemical composition in relation to their suitability for use in solid oxide fuel cells using the test results.
10. The method of claim 1 , further comprising adding a chemical agent to a predetermined region of differing chemical composition, wherein the chemical agent is operable for altering the microstructure of the predetermined region of differing chemical composition.
11. The method of claim 7 , wherein the porous layer comprises yttria-stabilized zirconia (“YSZ”).
12. The method of claim 1 , wherein the one or more materials are delivered to the porous layer via capillary forces.
13. The method of claim 1 , wherein the one or more materials are delivered to the porous layer via positive pressure.