[1] Univ South Carolina, Hydrogen & Fuel Cell Ctr, Dept Chem Engn, Columbia, SC 29208 USA
[2] Lawrence Berkeley Natl Lab, Electrochem Technol Grp, Berkeley, CA 94720 USA
[3] Univ South Carolina, Dept Mech Engn, Columbia, SC 29208 USA
[4] Argonne Natl Lab, Argonne Collaborat Ctr Energy Storage Sci, 9700 S Cass Ave, Argonne, IL 60439 USA