Journal ArticleDOI
Structural effects in electrocatalysis
TLDR
In this paper, a study of the oxidation kinetics of HCOOH, CH3OH and CH2O on single crystal platinum electrodes with (100), (110) and (111) orientations is presented.Abstract:
Studies of chemical reactions on well-defined surfaces provide fundamental data on surface reactivity and guidelines for the understanding and design of catalytic materials but few such studies have been done in electrocatalysis. We report here a study of the oxidation kinetics of HCOOH, CH3OH and CH2O on single crystal platinum electrodes with (100), (110) and (111) orientations. Pronounced dependence of the kinetics of these reactions on the crystallographic orientation of the surface has been found. The potential regions where reactions take place, the peaks of voltammetry curves, and the magnitude of currents at the peaks are different for each plane. These differences are explained on the basis of adsorption of a strongly bound intermediate, which shows a pronounced dependence on the symmetry of the single crystal planes. This intermediate completely blocks the Pt (100) surface; the smallest adsorption is at the (111) plane. On activation, the (100) surface shows the highest activity. These results suggest that electrocatalytic reactions exhibit structural sensitivity. They also provide guidelines for designing catalysts for the oxidation of small organic molecules to be used in electrochemical energy conversion.read more
Citations
More filters
Journal ArticleDOI
Platinum Metal Catalysts of High-Index Surfaces: From Single-Crystal Planes to Electrochemically Shape-Controlled Nanoparticles
TL;DR: The Natural Science Foundation of China as discussed by the authors [20673091, 20433060, 20503023, 20873113, 20833005], Mnistry of Science and Technology of China [2009CB220102, 2007DFA40890]
Journal ArticleDOI
Tuning reaction rates by lateral strain in a palladium monolayer.
Journal ArticleDOI
Structural effects in electrocatalysis: oxygen reduction on platinum low index single-crystal surfaces in perchloric acid solutions
TL;DR: Oxygen reduction was found to be sensitive to the crystallographic orientation of the platinum electrode surface as discussed by the authors, and a special cleaning procedure has been developed to remove impurities from the surface prior to the oxygen reduction measurements.
Journal ArticleDOI
Surface Structure Effects in Platinum/Ruthenium Methanol Oxidation Electrocatalysis
TL;DR: In this paper, the catalytic activity of low-index platinum single-crystal faces, Pt(111), Pt(100), and Pt(110), and polycrystalline platinum toward methanol electrooxidation was enhanced by controlled amounts of electrodeposited ruthenium.
Journal ArticleDOI
Shape-dependent electrocatalysis: methanol and formic acid electrooxidation on preferentially oriented Pt nanoparticles
José Solla-Gullón,Francisco J. Vidal-Iglesias,Ana López-Cudero,E. Garnier,E. Garnier,Juan M. Feliu,Antonio Aldaz +6 more
TL;DR: The results pointed out that the surface structure of the electrodes plays an important role on the reactivity of both oxidation processes, and thus the electrocatalytic properties strongly depend on thesurface structure/shape of the nanoparticles, in particular on the presence of sites with (111) symmetry.
References
More filters
Journal ArticleDOI
Preparation of monocrystalline Pt microelectrodes and electrochemical study of the plane surfaces cut in the direction of the {111} and {110} planes
Journal ArticleDOI
The oxidation of formic acid at noble metal electrodes
Andrew Capon,Roger Parsons +1 more
TL;DR: In this article, the dual path mechanism for HCOOH oxidation has been verified and the ability of Pt, Rh, Ir and Au to adsorb reaction intermediates in varying degrees has been demonstrated.
Journal ArticleDOI
Hydrogen Adsorption on Platinum Single Crystal Electrodes I . Isotherms and Heats of Adsorption
Journal ArticleDOI
Binding states of CO on single crystal planes of Pt
R.W McCabe,Lanny D. Schmidt +1 more
TL;DR: In this paper, flash desorption mass spectrometry and Auger electron spectroscopy were used to compare the binding states, Desorption and adsorption kinetics, and adsorbate densities on the (111, (100), (110, (110), (211), and (210) crystal planes of clean Pt.
Related Papers (5)
The oxidation of small organic molecules: A survey of recent fuel cell related research
R. Parsons,T. VanderNoot +1 more
The oxidation of formic acid at noble metal electrodes Part III. Intermediates and mechanism on platinum electrodes
Andrew Capon,Roger Parsons +1 more