Electrochemical characterization of gold stepped surfaces modified with Pd

Langmuir : the ACS Journal of Surfaces and Colloids
Fernando Hernandez, Helmut Baltruschat

Abstract

Three different single crystals, Au(111), Au(332), and Au(331), were used as the substrate for palladium deposition in the underpotential deposition (UPD) regime. The Au(111) single crystal was used for control experiments to compare the behavior of the vicinal surfaces. Cyclic voltammetry in 0.1 M sulfuric acid solution, as well as electrochemical impedance spectroscopy (EIS) were used to study the hydrogen adsorption on the Pd thin films. Our results suggest that the voltammetric peaks at approximately 0.3 V versus the reversible hydrogen electrode (RHE) are related to the adsorption of hydrogen at large palladium terraces, and that at least two adjacent Pd rows are needed in order for the adsorption to take place. Further cycling to more positive potentials leads to the oxidation and slow dissolution of the Pd film. The behavior of the oxidation cycles is explained in terms of a higher stability of Pd at the steps.

References

Sep 14, 2002·Faraday Discussions·J MeierU Stimming
Oct 18, 2003·Chemphyschem : a European Journal of Chemical Physics and Physical Chemistry·Michael Nielinger, Helmut Baltruschat
Jun 30, 2005·Langmuir : the ACS Journal of Surfaces and Colloids·Nagahiro HoshiYoshio Hori

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Citations

Oct 31, 2012·Physical Chemistry Chemical Physics : PCCP·Juan A Santana, Notker Rösch
Jan 13, 2011·Chemphyschem : a European Journal of Chemical Physics and Physical Chemistry·Helmut Baltruschat, Siegfried Ernst
Apr 17, 2010·Chemphyschem : a European Journal of Chemical Physics and Physical Chemistry·Holger WolfschmidtUlrich Stimming
Aug 5, 2010·Materials·Holger WolfschmidtUlrich Stimming
Sep 17, 2008·Journal of Physics. Condensed Matter : an Institute of Physics Journal·Holger WolfschmidtUlrich Stimming
Jun 29, 2021·The Journal of Physical Chemistry. C, Nanomaterials and Interfaces·Juan A Santana, Joshua Meléndez-Rivera
Jun 29, 2021·Surface Science·Gabriel A Vázquez-LizardiJuan A Santana
Sep 22, 2020·The Journal of Physical Chemistry. C, Nanomaterials and Interfaces·Juan A SantanaNotker Rösch

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