Use of W, Mo, and V Substituted Heteropolyacids for CO Mitigation in PEMFCs

Citations Over TimeTop 21% of 2007 papers

Abstract

A selection of eighteen different heteropolyacids (HPAs) were adsorbed onto Pt-on-carbon catalysts and investigated for enhanced proton exchange membrane fuel cell (PEMFC) anode CO tolerance. Structures tested were Keggin, Wells–Dawson, and a "Wells–Dawson sandwich." Compositions were varied by replacing W or Mo addenda atoms with V atoms in the Keggin structures and W addenda atoms with Fe, Mn, Ni, Co, and Cu in the Wells–Dawson or Wells–Dawson sandwich structures. Of those tested, it was found that only Keggin-structured HPAs of composition where , 2, and 3 had significant activity toward CO oxidation. This performance increased with content. Using fuel poisoned with CO the addition of improved the current obtained at to 525 from in fuel cell polarization experiments. Anode polarization experiments showed a performance improvement of about with the addition of this same HPA. These HPAs were behaving as catalysts and were not simply improving the resistance of mass transport of the electrodes. Cyclic voltammetry demonstrated that HPAs exhibit reversible reductions and oxidations in the fuel cell electrode under PEMFC operating conditions. CO tolerance increases were only noticed for HPAs which were reduced and oxidized at low overpotentials.

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