In situ back-side illumination fluorescence XAFS (BI-FXAFS) studies on platinum nanoparticles deposited on a HOPG surface as a model fuel cell: a new approach to the Pt-HOPG electrode/electrolyte interface.
We measured the in situ polarization-dependent X-ray absorption fine structure of platinum nanoparticles (PtNPs) deposited on a flat highly oriented pyrolytic graphite (HOPG) substrate under electrochemical conditions using a back-side illumination method. In this method, the thin HOPG substrate with PtNPs deposited on one side was used as a window for incident and fluorescent X-rays, as well as an electrode. A bent crystal Laue analyzer (BCLA) was applied to the extraction of the Pt Lα fluorescent X-ray signals from strong scattered X-rays. Pt L3 edge XAFS spectra were observed for various electrode potentials and polarization directions.
Catalysis Research Center, Hokkaido University, Sapporo, Hokkaido 001-0021, Japan. askr@cat.hokudai.ac.jp.
Hiromitsu
H
Uehara
Yohei
Y
Uemura
Takafumi
T
Ogawa
Kentaro
K
Kono
Ryoichi
R
Ueno
Yasuhiro
Y
Niwa
Hiroaki
H
Nitani
Hitoshi
H
Abe
Satoru
S
Takakusagi
Masaharu
M
Nomura
Yasuhiro
Y
Iwasawa
Kiyotaka
K
Asakura