Back to results
US 11,569,512 B2Granted
High-performance membrane electrode unit and the use thereof in fuel cells
AssigneeBASF Fuel Cell GmbH
InventorsThomas Schmidt, Oemer Uensal, Mathias Weber, Isabel Kundler, Gordon Calundann, Jochen Baurmeister
Life of this patent
Estimating the term…
Abstract
The present invention relates to a membrane electrode unit comprising a polymer membrane doped with a mineral acid as well as two electrodes, characterized in that the polymer membrane comprises at least one polymer with at least one nitrogen atom and at least one electrode comprises a catalyst which is formed from at least one precious metal and at least one metal less precious according to the electrochemical series.
Claims17
A membrane electrode unit consisting essentially of
- A) at least one polymer membrane which consists essentially of at least one alkaline polyazole polymer with at least one nitrogen atom, the polymer membrane including at least one mineral acid which is phosphoric acid,
- B) at least two electrodes one which is a cathode and one is an anode,
- wherein
- i) the cathode side consists of a Pt/Ni catalyst the Pt/Ni catalyst being on a carbon support and
- ii) the catalyst on the anode side consists of a Pt catalyst on a carbon support,
- iii) the alkaline polyazole polymer is a polybenzimidazole,
- iv) said catalyst on the anode side is loaded with 0.6 to 1 g/m2 Pt based on the surface area of the polymer membrane,
- v) said polymer membrane has proton conductivity of at least 0.1 S/cm @ 120° C. and
- vi) the membrane electrode unit providing for a current density of at least 0.3 A/cm3 (cell voltage of 0.6) when air is used on the cathode side.
6 more elements
Dependencies are inferred from the claim text.