title: Oxygen reduction on silver low-index single-crystal surfaces in alkaline solution: rotating ring disk(Ag(hkl)) studies.
abstract: The rotating ring disk method is applied to investigate the oxygen reduction reaction on Ag single-crystal surfaces in alkaline solution over the temperature range 293-333 K. At all temperatures, the oxygen reduction reaction proceeds through the 4e- reaction pathway with a very small (approximately 0.5-2%) peroxide formation. At the same temperature and overpotentials, the kinetics of the ORR always increases in the order (100) < or = (111) < (110), indicating that the reaction is structure-sensitive. We present an interpretation of the structure sensitivity based on the supposition that it arises from (i) a potential-dependent adsorption of spectator hydroxyl ions and (ii) variations in activation energies, which are determined by the O2 adsorption on Ag single-crystal surfaces covered by adsorbed oxygenated species.
authors.affiliation: Materials Sciences Division, Lawrence Berkeley National Laboratory, University of California, Berkeley, California 94720, USA. bbblizanac@lbl.gov
authors.forename: B B
authors.initials: BB
authors.lastname: Blizanac
authors.forename: P N
authors.initials: PN
authors.lastname: Ross
authors.forename: N M
authors.initials: NM
authors.lastname: Marković