title: Improvement of cathode performance on Pt-CeO(x) by optimization of electrochemical pretreatment condition for PEFC application.
abstract: Pt-CeO(x)/C electrocatalysts for the improvement of oxygen reduction reaction (ORR) activity on cathode were prepared by a combined process of precipitation and co-impregnation methods. The Pt-CeO(x)/C electrocatalysts pretreated by the optimized electrochemical conditioning process showed high ORR activity as compared with homemade Pt/C electrocatalyst. Also, it showed high stability in the cyclic voltammetry (CV) test up to 1000 cycles into 0.5 M H(2)SO(4) aqueous solution. On the basis of the data of cyclic voltammogram of 30 cyclic sweeps, X-ray photoelectron spectroscopy, electron energy loss spectroscopy, high resolution transmission electron microscope image, and selected area electron diffraction analysis, it is concluded that the Pt-CeO(x) heterointerface involving the defect cluster formed by using optimized electrochemical pretreatment conditions on Pt in Pt-CeO(x)/C electro-catalyst contributes to the promotion of ORR activity and retention of its stability in long CV tests up to 1000 cycles.
authors.affiliation: Graduate School of Chemical Sciences and Engineering, Hokkaido University, Kita13, Nishi8, Kita-ku, Sapporo, Hokkaido 060-8628 Japan.
authors.forename: Keisuke
authors.initials: K
authors.lastname: Fugane
authors.forename: Toshiyuki
authors.initials: T
authors.lastname: Mori
authors.forename: Ding Rong
authors.initials: DR
authors.lastname: Ou
authors.forename: Pengfei
authors.initials: P
authors.lastname: Yan
authors.forename: Fei
authors.initials: F
authors.lastname: Ye
authors.forename: Hideki
authors.initials: H
authors.lastname: Yoshikawa
authors.forename: John
authors.initials: J
authors.lastname: Drennan