Platinum redispersion on metal oxides in low temperature fuel cells

Vladimir Tripkovic, Isotta Cerri, Tetsuo Nagami, Thomas Bligaard, Jan Rossmeisl

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

We have analyzed the aptitude of several metal oxide supports (TiO2, SnO2, NbO2, ZrO2, SiO2, Ta2O5 and Nb2O5) to redisperse platinum under electrochemical conditions pertinent to the Proton Exchange Membrane Fuel Cell (PEMFC) cathode. The redispersion on oxide supports in air has been studied in detail; however, due to different operating conditions it is not straightforward to link the chemical and the electrochemical environment. The largest differences reflect in (1) the oxidation state of the surface (the oxygen species coverage), (2) temperature and (3) the possibility of platinum dissolution at high potentials and the interference of redispersion with normal working potential of the PEMFC cathode. We have calculated the PtOx (x = 0, 1, 2) adsorption energies on different metal oxides' surface terminations as well as inside the metal oxides' bulk, and we have concluded that NbO2 might be a good support for platinum redispersion at PEMFC cathodes.

Original languageEnglish
JournalPhysical Chemistry Chemical Physics
Volume15
Issue number9
Pages (from-to)3279-3285
ISSN1463-9076
DOIs
Publication statusPublished - 2013

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