US 9,812,727 B2
Charge transfer mediator based systems for electrocatalytic oxygen reduction
Shannon S. Stahl, Madison, WI (US); James B. Gerken, Madison, WI (US); and Colin W. Anson, Madison, WI (US)
Assigned to WISCONSIN ALUMNI RESEARCH FOUNDATION, Madison, WI (US)
Filed by Wisconsin Alumni Research Foundation, Madison, WI (US)
Filed on Jun. 8, 2017, as Appl. No. 15/617,181.
Application 15/617,181 is a continuation of application No. 14/657,531, filed on Mar. 13, 2015.
Claims priority of provisional application 61/953,342, filed on Mar. 14, 2014.
Prior Publication US 2017/0279148 A1, Sep. 28, 2017
Int. Cl. H01M 8/18 (2006.01); H01M 8/20 (2006.01); C25B 1/00 (2006.01); H01M 4/90 (2006.01); C25B 9/08 (2006.01)
CPC H01M 8/188 (2013.01) [C25B 1/00 (2013.01); C25B 9/08 (2013.01); H01M 4/9008 (2013.01); H01M 4/9041 (2013.01); H01M 8/20 (2013.01); Y02E 60/528 (2013.01)] 19 Claims
OG exemplary drawing
 
1. A fuel cell or electrosynthetic cell comprising:
(a) an anode half-cell containing an anode electrode, wherein in operation a fuel or precursor chemical is oxidized;
(b) a cathode half-cell comprising:
(i) an electrolyte solution comprising a redox mediator that is capable of transferring or accepting electrons and protons while undergoing reduction or oxidation;
(ii) a cathode electrode in contact with the electrolyte solution, where in operation the redox mediator is reduced; and
(iii) a heterogeneous redox catalyst in contact with the electrolyte solution, where in operation the redox mediator is oxidized, wherein the heterogeneous redox catalyst is not in direct contact with the cathode electrode;
(c) an inlet to facilitate the flow of O2 or air comprising O2 into the cathode half-cell, where in operation the O2 is reduced at the redox catalyst;
(d) a membrane separating the anode half-cell and the cathode half-cell; and
(e) an electrical circuit connecting the anode electrode and the cathode electrode.