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Oscillatory instabilities during formic acid oxidation on Pt(100), Pt(110) and Pt(111) under potentiostatic control. I. Experimental
The experimental characterization of the current/outer potential (I/U) behavior during the electrochemical CO oxidation on Pt(100), Pt(110) and Pt(111) is used as the first step towards a thorough inv...
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Mean field calculation of polymer segment depletion and depletion induced demixing in ternary systems of globular proteins and flexible polymers in a common solvent
We present a new method for calculating the depletion of polymer segments and the depletion induced demixing in solutions of flexible polymers and small globular proteins. The proteins are modelled as...

Oscillatory instabilities during formic acid oxidation on Pt(100), Pt(110) and Pt(111) under potentiostatic control. II. Model calculations

J. Chem. Phys. 107, 991 (1997); doi:10.1063/1.474451

Issue Date: 15 July 1997

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P. Strasser, M. Eiswirth, and G. Ertl
Fritz-Haber-Institut der Max-Planck-Gesellschaft, Faradayweg 4-6, D-14195 Berlin, Germany
A kinetic model is developed for the electrocatalytic oxidation of formic acid on Pt under potentiostatic control. The model development proceeds stepwise via a simple model of the electrocatalytic CO oxidation. The full model consists of four coupled, nonlinear ordinary differential equations. The scanned and stationary current/outer potential (I/U) behavior, stationary current oscillations, two-parameter bifurcation diagrams and stirring effects are simulated using realistic model parameters. The numerical findings are found to be consistent with the experimental results given by Strasser et al. The model reproduces period-1 as well as mixed-mode oscillations. Furthermore, a mechanistic analysis of the model was performed: two suboscillators are identified whose characteristics allow a plausible interpretation of the observed dynamics. After a classification of the suboscillators into previously described categories, an attempt is made to identify the minimal mechanistic requirements for electrochemical current oscillations. ©1997 American Institute of Physics.
History: Received 16 December 1996; accepted 8 April 1997
Permalink: http://link.aip.org/link/?JCPSA6/107/991/1
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KEYWORDS and PACS

Keywords
PACS
  • 82.65.Jv
    Physical Chemistry Surface and interface chemistry Heterogeneous catalysis at surfaces
  • 81.65.Mq
    Materials science Surface treatments Oxidation
  • 82.65.My
    Physical Chemistry Surface and interface chemistry Chemisorption
  • 68.45.-v
    Surfaces and interfaces; thin films and whiskers (Structure and nonelectronic properties) Solidfluid interfaces
  • 82.40.Bj
    Physical Chemistry Chemical kinetics and reactions: special regimes and techniques Oscillations, chaos, and bifurcations in homogeneous nonequilibrium reactors
  • 82.45.+z
    Physical Chemistry Electrochemistry and electrophoresis
  • YEAR: 1996-97

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PUBLICATION DATA

ISSN:
0021-9606 (print)   1089-7690 (online)
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REFERENCES (37)
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