Journal of the Serbian Chemical Society 2013 Volume 78, Issue 12, Pages: 1993-2005
https://doi.org/10.2298/JSC130927111A
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XPS and STEM study of the interface formation between ultra-thin Ru and Ir OER catalyst layers and perylene red support whiskers
Atanasoska Ljiljana L. (M Co., M Center, St. Paul, USA)
Cullen David A. (Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, USA)
Atanasoski Radoslav T. (M Co., M Center, St. Paul, USA)
The interface formation between nano-structured perylene red (PR) whiskers
and oxygen evolution reaction (OER) catalysts ruthenium and iridium has been
studied systematically by XPS and STEM. The OER catalyst over-layers with
thicknesses ranging from ~0.1 to ~50 nm were vapor deposited onto PR
ex-situ. STEM images demonstrate that, with increasing thickness, Ru and Ir
transform from amorphous clusters to crystalline nanoparticles, which
agglomerate with increased over-layer thickness. XPS data show a strong
interaction between Ru and PR. Ir also interacts with PR although not to the
extent seen for Ru. At low coverages, the entire Ru deposit is in the
reacted state while a small portion of the deposited Ir remains metallic. Ru
and Ir bonding occur at the PR carbonyl sites as evidenced by the
attenuation of carbonyl photoemission and the emergence of new peak assigned
to C-O single bond. The curve fitting analysis and the derived stoichiometry
indicates the formation of metallo-organic bonds. The co-existence of oxide
bonds is also apparent.
Keywords: fuel cell, catalyst, surface properties, deposition