Patent ID: 11894566
Assignee: ROBERT BOSCH GMBH
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC H  Y | IPC H

Claim 10:
11. A fuel cell stack comprising:
a first end region having a first number of fuel cell units, the first end region connected to a first reactant inlet, the first reactant inlet connected to a first reactant source configured to provide a first reactant to the fuel cell stack, the first reactant source being a hydrogen source, at least one of the first number of fuel cell units being a first fuel cell unit including a membrane electrode assembly (MEA) with a first catalyst material on either or both an anode and a cathode of the first fuel cell unit, the first catalyst material including a first catalyst composition;
a second end region having a second number of fuel cell units, the second end region connected to a second reactant inlet, the second reactant inlet connected to a second reactant source configured to provide a second reactant to the fuel cell stack, the second reactant source being an oxygen source, at least one of the second number of fuel cell units being a second fuel cell unit including an MEA with a second catalyst material on either or both an anode and a cathode of the second fuel cell unit, the second catalyst material including a second catalyst composition; and
a middle region having a third number of fuel cell units, the middle region situated between the first and the second end region, at least one of the third number of fuel cell units being a third fuel cell unit including an MEA with a third catalyst material on either or both an anode and a cathode of the third fuel cell unit, the third catalyst material including a third catalyst composition, the first catalyst material includes a first catalyst crystal facet distribution having a first catalytic activity and a first durability, the second catalyst material has a second catalyst crystal facet distribution having a second catalytic activity and a second durability, the third catalyst material has a third catalyst crystal facet distribution having a third catalytic activity and a third durability, the second catalytic activity is higher than the first and third catalytic activities, and the first and third durabilities are higher than the second durability.