Design criteria for stable Pt/C fuel cell catalysts

• Josef C. Meier,
• Carolina Galeano,
• Ioannis Katsounaros,
• Jonathon Witte,
• Hans J. Bongard,
• Angel A. Topalov,
• Claudio Baldizzone,
• Stefano Mezzavilla,
• Ferdi Schüth and
• Karl J. J. Mayrhofer

Beilstein J. Nanotechnol. 2014, 5, 44–67, doi:10.3762/bjnano.5.5

• , 40237 Düsseldorf, Germany Department of Heterogeneous Catalysis, Max-Planck-Institut für Kohlenforschung, Kaiser-Wilhelm-Platz 1, 45470 Mülheim an der Ruhr, Germany 10.3762/bjnano.5.5 Abstract Platinum and Pt alloy nanoparticles supported on carbon are the state of the art electrocatalysts in proton

• environmental conditions, for instance in moisturized air, were also reported [50],[61][62][63]. Aiming for a visualization of the degradation processes that electrocatalysts undergo under electrochemical conditions, our group has developed an electron microscopic method to study identical locations of

• confirmed in sulfuric acid (see Table 1 and Figure S2 in Supporting Information File 1). Macroscopic stability investigation While cathode electrocatalysts are rather stable under constant fuel cell operating conditions for hundreds or even thousands of hours, they can degrade rapidly if subjected to more

Some reflections on the understanding of the oxygen reduction reaction at Pt(111)

• Ana M. Gómez-Marín,
• Ruben Rizo and
• Juan M. Feliu

Beilstein J. Nanotechnol. 2013, 4, 956–967, doi:10.3762/bjnano.4.108

• electrocatalysts for fuel-cell cathodes is only possible through a cooperative approach between theory and experiments. Keywords: hydrogen peroxide oxidation; hydrogen peroxide reduction; oxygen reduction; Pt(111); stepped surfaces; Introduction Nowadays, the oxygen reduction reaction (ORR) is arguably one of

• step (RDS) on Pt, which would be an essential step toward an optimized design of new ORR electrocatalysts [15]. Results and Discussion Ideally, the surface structure and composition of a catalyst remain unchanged over the whole potential range in which a probe reaction is scrutinized. However, as can

• ][54]. Surface sensitive reactions Since early works [55][56], it has been known that there are volcano type responses when the ORR current densities, at a chosen potential, are plotted for different electrocatalysts as a function of either the adsorption bond strength, ΔGads, of the Oads, OHads and