RT info:eu-repo/semantics/article
T1 Surface diffusion of poisoning species during CO and formic acid oxidation on PtAu surface. The key role of the active site.
A1 Pastor Tejera, Elena María
A1 Minudri, Daniela
A1 Tesio, Alvaro Y.
A1 Fungo, Florencia
A1 Palacios, Rodrigo E.
A1 Cappellari, Paula S.
A1 Planes, Gabriel A.
A2 Química
A2 Instituto Universitario de Materiales y Nanotecnología
CISEL - Ciencia de superficies y electrocatálisis
K1 Formic acid
K1 Pt/Au
K1 Electroless
K1 In-situ FTIR
AB A comparative study of the Pt and Pt/Au surface towards CO and formic acid oxidation was performed by conventional electrochemical techniques used in combination with an electrochemical flow cell (four-electrode configuration) and in-situ Fourier Transform Infrared Spectroscopy. With this purpose, a polycrystalline Pt electrode was modified by spontaneous deposition of gold atoms, achieving a gold surface coverage (θ) in the range of 0 ≤ θ ≤ 0.47. Formic acid and carbon monoxide electrooxidation on polycrystalline Pt and Au-modified Pt surfaces were studied by cyclic voltammetry, linear sweep voltammetry, chronoamperometry and in-situ FTIR techniques. The electrochemical and in-situ FTIR evidence collected for CO and FA oxidation on Pt/Au support the idea of a strongly modified Pt surface. At the Pt/Au electrode, Au operates as a barrier between surface domains, and the main observable result is the uncoupling of the catalytic activity. The free (fast) surface diffusion of reactants at a low potential, which leads to characterize Ptpc as a “homogeneous surface” towards CO and FA oxidation, is not possible when Au is present.
SN 0378-7753
YR 2021
FD 2021
LK http://riull.ull.es/xmlui/handle/915/42012
UL http://riull.ull.es/xmlui/handle/915/42012
LA en
DS Repositorio institucional de la Universidad de La Laguna
RD 13-nov-2025