COMPLEX ELECTROLYTE MEMBRANE FOR A FUEL CELL, METHOD FOR MANUFACTURING SAME, AND FUEL CELL INCLUDING SAME
First Claim
1. A composite electrolyte membrane for a fuel cell which comprises a polybenzimidazole-based polymer and a metal-grafted porous structure and is doped with phosphoric acid wherein the metal-grafted porous structure is present in an amount of 0.1 to 30% by weight, based on the weight of the polymer.
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Abstract
Disclosed is a composite electrolyte membrane for a fuel cell. The composite electrolyte membrane includes a polybenzimidazole-based polymer and a metal-grafted porous structure. The composite electrolyte membrane is doped with phosphoric acid. The metal-containing porous structure is present in an amount of 0.1 to 30% by weight, based on the weight of the polymer. The presence of the metal-containing porous structure allows the fuel cell electrolyte membrane to have excellent thermal properties and high proton conductivity.
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Citations
16 Claims
- 1. A composite electrolyte membrane for a fuel cell which comprises a polybenzimidazole-based polymer and a metal-grafted porous structure and is doped with phosphoric acid wherein the metal-grafted porous structure is present in an amount of 0.1 to 30% by weight, based on the weight of the polymer.
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6. A method for producing a composite electrolyte membrane for a fuel cell, comprising
forming a metal-grafted porous structure, mixing the metal-grafted porous structure with a solution of a polybenzimidazole-based polymer to form a composite membrane, and doping the composite membrane with phosphoric acid to impart ionic conductivity thereto.
Specification