Oxidation-stabilised polymer electrolyte membrane for fuel cells
AssigneeDaimler AG
InventorsFlorian Finsterwalder, Thomas Soczka-Guth, Manuel Christian Schaloske
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Abstract
Polymer electrolyte membrane (PEM) made from perfluorosulfonic acid polymers, displaying proton conductivity at least in the presence of water, adequate for operation in a fuel cell, comprising at least one oxidation protection agent and additives. The PEM is an acid/base polymer blend which forms acidic and basic domains, the basic polymer being formed by polybenzimidazole (PBI) and the at least one oxidation protection agent being formed by manganese oxide.
Claims15
A polymer electrolyte membrane (PEM) which exhibits a proton conductivity at least in the presence of water, the proton conductivity being sufficient for the operation in a fuel cell, comprising:
- at least one oxidation protection agent,
- additives, and
- a blend of an acid polymer and a base polymer which blend forms acidic and basic domains,
- wherein the basic polymer is polybenzimidazole (PBI), the acid polymer is perfluorosulfonic acid polymer and the at least one oxidation protection agent is manganese oxide,
- wherein the perfluorosulfonic acid polymer forms a proton conductive matrix phase,
- wherein manganese oxide is embedded in the basic domains formed by the polybenzimidazole,
- wherein the membrane contains water in an amount of 1-10 mol water per mol sulfonic acid groups, and
- wherein polybenzimidazole (PBI) comprises 0.5 to 8 weight % of the PEM.
A polymer electrolyte membrane (PEM) which exhibits a proton conductivity at least in the presence of water, the proton conductivity being sufficient for the operation in a fuel cell, comprising:
- at least one oxidation protection agent,
- additives, and
- a blend of an acid polymer and a base polymer which blend forms acidic and basic domains,
- wherein the basic polymer is polybenzimidazole (PBI), the acid polymer is perfluorosulfonic acid polymer,
- wherein polybenzimidazole (PBI) comprises 0.5 to 8 weight % of the PEM,
- wherein the at least one oxidation protection agent is manganese oxide, and
- wherein the ratio of MnO2 to PBI is in the region of 0.1 to 1 in weight %.
A polymer electrolyte membrane (PEM) which exhibits a proton conductivity at least in the presence of water, the proton conductivity being sufficient for the operation in a fuel cell, comprising:
- at least one oxidation protection agent,
- additives, and
- a blend of an acid polymer and a base polymer which blend forms acidic and basic domains,
- wherein the basic polymer is polybenzimidazole (PBI), the acid polymer is perfluorosulfonic acid polymer and the at least one oxidation protection agent is manganese oxide,
- wherein polybenzimidazole (PBI) comprises 0.5 to 8 weight % of the PEM, and
- wherein the MnO2 is primarily bound in the basic domains of the acid/base polymer blend.
Dependencies are inferred from the claim text.