Granted Patent B2

US 8,685,580 · App. 12/143,041 · Granted Apr 1, 2014

Abstract

Claims (13)

1. A fuel cell comprising an electrolyte layer, a gas diffusion layer, and a microporous layer between said electrolyte layer and said gas diffusion layer, wherein said microporous layer comprises an electrolyte material having contained therein electrically conductive particles, an electrolyte stabilizing agent, and a hydrophobic agent, wherein said electrolyte stabilizing agent is present from 0.1 wt. % to 10 wt. % and said hydrophobic agent is present from 5 wt. % to 50 wt. %, based on the total weight of the microporous layer, and wherein said electrolyte stabilizing agent has an affinity for the electrolyte layer so that a metal ion of the electrolyte stabilizing agent migrates from said microporous layer to said electrolyte layer, wherein the electrolyte stabilizing agent comprises zinc phthalocyanine, copper phthalocyanine, iron phthalocyanine, or cobalt phthalocyanine, or an organometallic complex of Cu 2+ , Cu 1+ , Ce 3+ , Ce 4+ , Mn 2+ , Mn 3+ or Zn 2± .

2. A fuel cell as set forth in claim 1 , wherein said electrolyte layer is a proton conductive membrane.

3. A fuel cell as set forth in claim 1 , wherein said microporous layer comprises a carbon particle, a hydrophobic polymer and said electrolyte stabilizing agent.

4. A fuel cell as set forth in claim 1 further comprising an anode and a cathode, wherein said anode and cathode are disposed on opposite sides of said electrolyte layer and said microporous layer is in contact with at least one of said anode and cathode such that said metal ion provided by said electrolyte stabilizing agent is configured to migrate from said microporous layer to at least one of said anode and cathode, and to said electrolyte layer.

5. A fuel cell as set forth in claim 4 , wherein said metal ion provided by said electrolyte stabilizing agent is cerium ion.

6. A fuel cell as set forth in claim 4 , wherein said electrolyte layer comprises a perfluorinated sulfonic acid polymer electrolyte.

7. A fuel cell comprising an electrolyte layer, a gas diffusion layer, and a microporous layer between said electrolyte layer and said gas diffusion layer, wherein said microporous layer comprises an electrolyte material having contained therein electrically conductive particles, an electrolyte stabilizing agent, and a hydrophobic agent, wherein said electrolyte stabilizing agent is present from 0.1 wt. % to 10 wt. % and said hydrophobic agent is present from 5 wt. % to 50 wt. %, based on the total weight of the microporous layer, and wherein said electrolyte stabilizing agent provides a metal ion that migrates from said microporous layer to said electrolyte layer, wherein the electrolyte stabilizing agent comprises an alloy comprising at least one of Cu, Ni, Mn or Ce elements.

8. A process comprising: providing a plurality of fuel cell component layers including electrochemically active and electrochemically non-active layers, wherein said electrochemically active layers include an anode layer, a cathode layer, and an electrolyte membrane layer, and said electrochemically non-active layers include a gas diffusion layer and a microporous layer; combining an electrolyte stabilizing agent and a hydrophobic agent into a solution or dispersion; incorporating said solution or dispersion, in which said electrolyte stabilizing agent and said hydrophobic agent have been previously combined in at least one of said electrochemically non-active layers; and forming a fuel cell by stacking said electrochemically active and non-active layers together such that said electrolyte stabilizing agent provides a metal ion from a non-active layer to an active layer during operation of said fuel cell, wherein the electrolyte stabilizing agent comprises an alloy comprising at least one of Cu, Ni, Mn or Ce elements.

9. A fuel cell comprising an electrolyte layer, a gas diffusion layer, and a microporous layer between said electrolyte layer and said gas diffusion layer, wherein said microporous layer comprises an electrolyte material having contained therein electrically conductive particles, an electrolyte stabilizing agent, and a hydrophobic agent, wherein said electrolyte stabilizing agent is present from 0.1 wt. % to 10 wt. % and said hydrophobic agent is present from 5 wt. % to 50 wt. %, based on the total weight of the microporous layer, and wherein said electrolyte stabilizing agent has an affinity for the electrolyte layer so that a metal ion of the electrolyte stabilizing agent migrates from said microporous layer to said electrolyte layer, wherein the electrolyte stabilizing agent comprises zinc phthalocyanine, copper phthalocyanine, iron phthalocyanine, or cobalt phthalocyanine, or an organometallic complex of Cu 2+ , Cu 1+ , Ce 3+ , Ce 4+ , or Zn 2+ .

10. A fuel cell comprising an electrolyte layer, a gas diffusion layer, and a microporous layer between said electrolyte layer and said gas diffusion layer, wherein said microporous layer comprises an electrolyte material having contained therein electrically conductive particles, an electrolyte stabilizing agent, and a hydrophobic agent, wherein said electrolyte stabilizing agent is present from 0.1 wt. % to 10 wt. % and said hydrophobic agent is present from 5 wt. % to 50 wt. %, based on the total weight of the microporous layer, and wherein said electrolyte stabilizing agent has an affinity for the electrolyte layer so that a metal ion of the electrolyte stabilizing agent migrates from said microporous layer to said electrolyte layer, wherein the electrolyte stabilizing agent comprises zinc phthalocyanine, copper phthalocyanine, iron phthalocyanine, or cobalt phthalocyanine, or an organometallic complex of Cu 2+ , Cu 1+ , Ce 3+ , or Zn 2+ .

11. A process comprising: providing a plurality of fuel cell component layers including electrochemically active and electrochemically non-active layers, wherein said electrochemically active layers include an anode layer, a cathode layer, and an electrolyte membrane layer, and said electrochemically non-active layers include a gas diffusion layer and a microporous layer; combining an electrolyte stabilizing agent and a hydrophobic agent into a solution or dispersion; applying said solution or dispersion to the microporous layer to form a treated microporous layer such that 0.1 wt. % to 10 wt. % of said electrolyte stabilizing agent and 5 wt. % to 50 wt. % of said hydrophobic agent based on the total weight of the treated microporous layer have been previously combined and incorporated in the treated microporous layer; and forming a fuel cell by stacking said electrochemically active layers, said gas diffusion layer and said treated microporous layer together such that said electrolyte stabilizing agent provides a metal ion from the treated microporous layer to an active layer during operation of said fuel cell, wherein the electrolyte stabilizing agent comprises zinc phthalocyanine, copper phthalocyanine, iron phthalocyanine, or cobalt phthalocyanine, or an organometallic complex of Cu 2+ , Cu 1+ , Ce 3+ , Ce 4+ , Mn 2+ , Mn 3+ or Zn 2+ .

12. A process comprising: providing a plurality of fuel cell component layers including electrochemically active and electrochemically non-active layers, wherein said electrochemically active layers include an anode layer, a cathode layer, and an electrolyte membrane layer, and said electrochemically non-active layers include a gas diffusion layer and a microporous layer; combining an electrolyte stabilizing agent and a hydrophobic agent into a solution or dispersion; applying said solution or dispersion to the microporous layer to form a treated microporous layer such that 0.1 wt. % to 10 wt. % of said electrolyte stabilizing agent and 5 wt. % to 50 wt. % of said hydrophobic agent based on the total weight of the treated microporous layer have been previously combined and incorporated in the treated microporous layer; and forming a fuel cell by stacking said electrochemically active layers, said gas diffusion layer and said treated microporous layer together such that said electrolyte stabilizing agent provides a metal ion from the treated microporous layer to an active layer during operation of said fuel cell, wherein the electrolyte stabilizing agent comprises zinc phthalocyanine, copper phthalocyanine, iron phthalocyanine, or cobalt phthalocyanine, or an organometallic complex of Cu 2+ , Cu 1+ , Ce 3+ , Ce 4+ , or Zn 2+ .

13. A process comprising: providing a plurality of fuel cell component layers including electrochemically active and electrochemically non-active layers, wherein said electrochemically active layers include an anode layer, a cathode layer, and an electrolyte membrane layer, and said electrochemically non-active layers include a gas diffusion layer and a microporous layer; combining an electrolyte stabilizing agent and a hydrophobic agent into a solution or dispersion; applying said solution or dispersion to the microporous layer to form a treated microporous layer such that 0.1 wt. % to 10 wt. % of said electrolyte stabilizing agent and 5 wt. % to 50 wt. % of said hydrophobic agent based on the total weight of the treated microporous layer have been previously combined and incorporated in the treated microporous layer ; and forming a fuel cell by stacking said electrochemically active layers, said gas diffusion layer and said treated microporous layer together such that said electrolyte stabilizing agent provides a metal ion from the treated microporous layer to an active layer during operation of said fuel cell, wherein the electrolyte stabilizing agent comprises zinc phthalocyanine, copper phthalocyanine, iron phthalocyanine, or cobalt phthalocyanine, or an organometallic complex of Cu 2+ , Cu 1+ , Ce 3+ , or Zn 2+ .

Assignments (12)