HydrogenOxygen PEMFC

1
Hydrogen/Oxygen PEMFC
L. Carrette et al., Fuel Cells, 2001, 1, 5
2
Anode vs. Cathode Overpotentials
L. Carrette et al., Fuel Cells, 2001, 1, 5
3
Oxygen reduction reaction

• Carbon supported Pt most common cathode for the
  oxygen reduction reaction (ORR)
• ½O2 2e- ? O2-
• Problems include the cost, availability and its
  sensitivity to organics (CO poisoning)
• Oxidizes above 1 V, lowering activity
• Goal to make a more robust, cheaper cathode

1. Sepa, D.B., Damjanovic, A. J. OM. Bockris.
Electrochim. Acta 12, 746 (1967).
4
Restrictions

• Must be able to do what the Pt cathode can
• Conduct electricity
• Stable in acidic solution (Nafion membrane)
• Catalytic to the ORR
• Goals
• Cheaper than platinum
• Resilient to air
• High ORR activity

5
Previous Studies

• Studies by Bockris
• Na0.6WO3

1. Sepa, D.B., Damjanovic, A. J. OM. Bockris.
Electrochim. Acta 12, 746 (1967).
6
What will we focus on?

• Perovskites
• ABO3 AIBVO3, AIIBIVO3, AIIIBIIIO3
• Bronzes such as MxWO3
• Related to the perovskites
• (x lt 1)