Publications in Scientific Journals:

O. Gamba Vasquez, H. Noei, J. Pavelec, R. Bliem, M. Schmid, U. Diebold, A. Stierle, G. Parkinson:
"Adsorption of formic acid on the Fe3O4(001) surface";
Journal of Physical Chemistry C, 119 (2015), 20459 - 20465.

English abstract:
The adsorption of formic acid (HCOOH) on the
Fe3O4(001) surface was studied using X-ray photoelectron
spectroscopy, infrared reflection absorption spectroscopy
(IRRAS), low-energy electron diffraction, and scanning tunneling
microscopy (STM). At room temperature, HCOOH dissociates
to form formate (HCOO−) and hydroxyl groups, facilitated by
the close proximity of undercoordinated Fe3+/O2− cation/anion
pairs at the Fe3O4(001) surface. Bidentate formate species are
observed in IRRAS, and their position on Fe−Fe bridge sites can
be inferred from STM data. At 70 K, HCOOH is adsorbed both
dissociatively and molecularly, suggesting two active sites for
dissociation. Our study also demonstrates that IRRAS is possible
on Fe3O4 single crystals with good sensitivity but that unusual
peak shapes occur because the substrate is midway between a perfect conductor and a perfect dielectric.

Created from the Publication Database of the Vienna University of Technology.