Screen printing method for making an electrochemical cell electrode
First Claim
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1. A method for making an electrochemical cell electrode comprising the steps of:
- floccing a co-suspension of carbon particles and hydrophobic fluorocarbon polymer particles;
drying the floc so produced and reducing it to a powder;
resuspending the floc powder in an inking vehicle to form an ink;
screen printing the ink onto a porous substrate to form a layer;
drying the layer to remove the inking vehicle;
compacting the layer;
sintering the compacted layer; and
catalyzing the layer.
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Abstract
Fuel cell electrodes of uniform quality are made on a continuous basis using screen printing. A wet floc is first made by floccing a co-suspension of carbon and hydrophobic polymer. The floc is dried, reduced to a fine powder, and re-suspended in an inking vehicle. The ink is then screen printed onto a porous substrate and the inking vehicle is removed such as by heating. The layer is compacted, sintered, and then catalyzed such as with platinum.
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Citations
10 Claims
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1. A method for making an electrochemical cell electrode comprising the steps of:
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floccing a co-suspension of carbon particles and hydrophobic fluorocarbon polymer particles; drying the floc so produced and reducing it to a powder; resuspending the floc powder in an inking vehicle to form an ink; screen printing the ink onto a porous substrate to form a layer; drying the layer to remove the inking vehicle; compacting the layer; sintering the compacted layer; and catalyzing the layer. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A method for making an electrochemical call electrode using a powder made by floccing a co-suspension of carbon particles and hydrophobic fluorocarbon polymer particles, drying the floc so-produced and reducing it to a powder, comprising the steps of:
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suspending the floc powder in an inking vehicle to form an ink; screen printing the ink onto a porous substrate to form a layer; drying the layer to remove the inking vehicle;
compacting the layer;sintering the compacted layer; and
,catalyzing the layer. - View Dependent Claims (10)
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Specification