title: Mapping platinum species in polymer electrolyte fuel cells by spatially resolved XAFS techniques.
abstract: There is limited information on the mechanism for platinum oxidation and dissolution in Pt/C cathode catalyst layers of polymer electrolyte fuel cells (PEFCs) under the operating conditions though these issues should be uncovered for the development of next-generation PEFCs. Pt species in Pt/C cathode catalyst layers are mapped by a XAFS (X-ray absorption fine structure) method and by a quick-XAFS(QXAFS) method. Information on the site-preferential oxidation and leaching of Pt cathode nanoparticles around the cathode boundary and the micro-crack in degraded PEFCs is provided, which is relevant to the origin and mechanism of PEFC degradation.
authors.affiliation: Innovation Research Center for Fuel Cells, The University of Electro-Communications, Chofu, Tokyo 182-8585 (Japan).
authors.forename: Shinobu
authors.initials: S
authors.lastname: Takao
authors.forename: Oki
authors.initials: O
authors.lastname: Sekizawa
authors.forename: Shin-ichi
authors.initials: S
authors.lastname: Nagamatsu
authors.forename: Takuma
authors.initials: T
authors.lastname: Kaneko
authors.forename: Takashi
authors.initials: T
authors.lastname: Yamamoto
authors.forename: Gabor
authors.initials: G
authors.lastname: Samjeské
authors.forename: Kotaro
authors.initials: K
authors.lastname: Higashi
authors.forename: Kensaku
authors.initials: K
authors.lastname: Nagasawa
authors.forename: Takuya
authors.initials: T
authors.lastname: Tsuji
authors.forename: Motohiro
authors.initials: M
authors.lastname: Suzuki
authors.forename: Naomi
authors.initials: N
authors.lastname: Kawamura
authors.forename: Masaichiro
authors.initials: M
authors.lastname: Mizumaki
authors.forename: Tomoya
authors.initials: T
authors.lastname: Uruga
authors.forename: Yasuhiro
authors.initials: Y
authors.lastname: Iwasawa
keywords: X-ray absorption spectroscopy; catalysts; electrochemistry; fuel cells; platinum