Method of forming catalyst layer by single step infiltration
AssigneeU.S. Department of Energy
InventorsKirk Gerdes, Shiwoo Lee, Regis Dowd
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Abstract
Provided herein is a method for electrocatalyst infiltration of a porous substrate, of particular use for preparation of a cathode for a solid oxide fuel cell. The method generally comprises preparing an electrocatalyst infiltrate solution comprising an electrocatalyst, surfactant, chelating agent, and a solvent; pretreating a porous mixed ionic-electric conductive substrate; and applying the electrocatalyst infiltration solution to the porous mixed ionic-electric conductive substrate.
Claims24
A method of electrocatalyst infiltration of a porous substrate comprising
- preparing an electrocatalyst infiltration solution, where the electrocatalyst infiltration solution comprises:
- a solvent,
- an electrocatalyst, where the electrocatalyst is present in the concentration from about 0.2 M to about 1.0 M,
- a chelating agent, where the chelating agent is present in a concentration from about 1:0.2 to about 1:1 mol fraction electrocatalyst to chelating agent, and
- a surfactant, where the surfactant is present in a concentration from about 30% CMC to about 100% CMC;
- pretreating a porous substrate, where the temperature of the porous substrate is from about 10° C. to about 40° C.;
- and,
- applying the electrocatalyst infiltration solution to a porous substrate, where the porous substrate is mixed ionic-electronic conductive substrate, thereby forming a cathode.
A method of electrocatalyst infiltration of a porous substrate comprising:
- preparing an electrocatalyst infiltration solution, where the electrocatalyst infiltration solution comprises:
- a solvent,
- an electrocatalyst, where the electrocatalyst is a metal salt in the concentration from about 0.8 M to about 1.0 M,
- a chelating agent, where the chelating agent is present in a concentration from about 1:0.25 to about 1:0.35 mol fraction electrocatalyst to chelating agent, and
- a surfactant, where the surfactant is present in a concentration from about 80% CMC to about 100% CMC;
- pretreating a porous substrate, where the temperature of the porous substrate is from about 15° C. to about 30° C.;
- and,
- applying the electrocatalyst infiltration solution by ultrasonic atomization where the droplet size is in a range from about 10 microns to 30 microns, to a porous substrate, where the porous substrate is mixed ionic-electronic conductive substrate, thereby forming a solid oxide fuel cell cathode.
Dependencies are inferred from the claim text.