Abrasion resistant solid oxide fuel cell electrode ink
View Patent ↗A method for forming a solid oxide fuel cell (SOFC) includes co-firing the anode and cathode electrode layers, which involves placing an unfired anode onto a surface during the cathode print cycle. To avoid damage to the electrolyte and cathode production cycle by the green anode ink, an abrasion resistant ink is used to print the anode electrode layer.
1. A method of making a solid oxide fuel cell (SOFC), comprising:
forming a first electrode on a first side of a planar solid oxide electrolyte using an abrasion resistant ink;
drying the first electrode;
forming a second electrode on a second side of the solid oxide electrolyte prior to firing the first electrode;
drying the second electrode; and
firing the first and second electrodes during a single firing step;
wherein the abrasion resistant ink comprises:
around 60-80 wt. % of a composite powder, wherein the composite powder comprises a metal phase and a ceramic phase;
around 1-10 wt. % of a binder, wherein the binder comprises a polymer or polymer precursor;
zero to less than 2 wt. % of a dispersant;
zero to less than 1 wt. % of a plasticizer; and
wherein the ink contains 5-35% wt. % organic solvent which comprises etidronic acid.
2. A method of making a solid oxide fuel cell (SOFC), comprising:
forming a first electrode on a first side of a planar solid oxide electrolyte using an abrasion resistant ink;
drying the first electrode;
forming a second electrode on a second side of the solid oxide electrolyte prior to firing the first electrode;
drying the second electrode; and
firing the first and second electrodes during a single firing step,
wherein the abrasion resistant ink comprises:
around 60-80 wt. % of a composite powder, wherein the composite powder comprises a metal phase and a ceramic phase;
around 1-10 wt. % of a binder, wherein the binder comprises a polymer or polymer precursor;
around 5-35% wt. % of an organic solvent;
zero to less than2 wt. % of a dispersant; and
zero to less than 1 wt. % of a plasticizer;
the ceramic phase in the composite powder comprises samaria-doped ceria (SDC);
the metal phase in the composite powder comprises nickel oxide;
the binder comprises a derivative of methacrylic acid;
the solvent comprises etidronic acid;
the ink contains greater than zero wt. % of the dispersant, wherein the dispersant comprises a polyester/polyamine co-polymer; and
the ink contains greater than zero wt. % of the plasticizer, wherein the plasticizer comprises butyl benzyl phthalate (BBP).
3. The method of claim 2 , wherein the binder comprises an acrylic polymer, ethyl cellulose, polyvinyl alcohol, or polyvinyl butyral.
4. A method of making a solid oxide fuel cell (SOFC), comprising:
forming a first electrode on a first side of a planar solid oxide electrolyte using an abrasion resistant ink;
drying the first electrode;
forming a second electrode on a second side of the solid oxide electrolyte prior to firing the first electrode;
drying the second electrode;
firing the first and second electrodes during a single firing step; and
forming a top coat over the first electrode, wherein the top coat comprises a lacquer layer that comprises etidronic acid and a derivative of methacrylic acid.