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Fuel cells

  • US 9,136,554 B2
  • Filed: 07/19/2007
  • Issued: 09/15/2015
  • Est. Priority Date: 07/19/2006
  • Status: Expired due to Fees
First Claim
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1. A redox fuel cell comprising:

  • an anode region comprising an anode and a cathode region comprising a cathode, said regions being separated by an ion selective polymer electrolyte membrane;

    a fuel passage through which fuel is supplied to the anode region of the cell;

    an oxidant inlet that supplies an oxidant to the cathode region of the cell;

    an electrical circuit between the anode and the cathode; and

    a catholyte solution comprising at least one non-volatile catholyte component flowing in fluid communication with the cathode, the catholyte solution comprising a redox mediator and a separate redox catalyst, wherein the redox mediator is at least partially reduced at the cathode in operation of the cell, and at least partially regenerated by reaction with the oxidant after such reduction at the cathode;

    wherein the catholyte solution comprises a complexed multidentate N-donor ligand as the redox catalyst.

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