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Re Fuel Cells (Chapter 3 (FC Degradtion (Catalyst (Failure mode…

- - - - Failure mode
        
        Mechanical
        
        mechanical pressure
        
        Thermal
        
        Chemical
    - - Failure mode
        
        Conductivity loss
        
        dehydration
        
        Reformatting tolerance
        
        destroy of platinum
        
        Activation loss
        
        CO poisoing
      - Fenton test
    - - OH attacks
      - loss
        
        loss PTFE
        
        carbon
        
        decrease conductivity
    - - Failure mode
        
        deform
        
        Mechanical stress
        
        Conductivity loss
        
        Contact wear
    - - Thermal stress
  - - - Good
        
        increase Diffusion
        
        Force O2 & H2 into contect
        
        Ohmic Range decreased Resistance
        
        Polarztion graph
        
        Increase Reaction rates
      - Bad
        
        Stress seal
    - - Resistance decrease
      - Mass transfer
      - limited to 100C
        
        Starvation O2
    - - area use
      - mass enter
    - - pure oxygen will riase the efficiency
  - - - voltage
        
        formula
        
        do not take fuel losses
      - Energy
        
        save power consumtion
  - - - in between ohmic & concearation
    - - 1.23
    - - Ohmic
      - Conceartation
      - Activitytion
    - - Activation
      - Ohmic
    - - there resistance
- - - - best efficieny
      - charge carrier
        
        H+
      - electrolyate
        
        Nafion / PFSA
      - catalyst
        
        Ptuiltmum
    - - charge carrier
        
        H+
      - catalyst
        
        Ptuiltmum
      - electrolyate
        
        Nafion / PFSA
      - Disadvanatage
        
        slow start up
        
        require high temp
        
        low power desitly
    - - charge carrier
    - - charge carrier
    - - Advantage
        
        Cheap
        
        plainfully
      - Disadvantage
        
        only available use in low CO2 area
        
        easy poisen
      - charge carrier
        
        OH-
      - electrolyate
        
        Aqueous
      - catalyst
        
        Ptuiltmum
    - - Different
        
        Sluggish reaction
        
        High surface area
      - advantage
        
        clean vapor
        
        efficient coolant
      - fuel
        
        water
        
        Methanol
        
        Air
      - Disadvantage
        
        more Catalyst need
      - charge carrier
- - - - advantage
        
        very well dvelop
      - Disadvantage
        
        loss energy by feezing
        
        over time loss energy
    - - Advantage
        
        Reversible
        
        Highly safety
      - Disadvantage
        
        super heavy
    - - Advantage
        
        Very well develop
      - Disadvantage
        
        low volume
        
        Safety concerns
- - - - types metrails
        
        grpiths
        
        steeless
      - types
        
        strailet and perral
        
        serpent
    - - transfer electron
      - prevents H2/O2 contact
      - create pathway for electron
      - also the electrolyte
      - need to hydrated during operation
    - - create reaction
      - reaction is the moducle squsk out
      - make platinum
      - optimzie
        
        how
        
        wide surface area
        
        why
        
        is expansive
        
        prone to posien
    - - Anode
      - cathode
      - Membrane