Issue 36, 2010

Temperature effects on COadsorption/desorption at Pt film electrodes: an electrochemical in situ infrared spectroscopic study

Abstract

The effects of temperature, COad surface coverage, and electrode potential on the desorption of COad from Pt film electrodes in 0.5 M H2SO4 have been investigated by electrochemical in situ FTIR spectroscopy under an attenuated-total-reflection configuration (EC-FTIRS). The major findings are: (i) When θrel ≥ 0.53 (θCO is the relative COad coverage), COad desorption takes place at T > 40 °C (as confirmed by the decrease in both of the C–OL stretching frequency as well as the COad stripping charge), and when θrel is below 0.39, no COad desorption is observed at temperatures up to 70 °C; (ii) A slight increase in COad desorption rate with electrode potential from 0.1 to 0.3 V and fast adsorption/desorption equilibrium in solution saturated with CO are observed; (iii) From the temperature-dependent changes in COad surface coverage, the activation energies for COad desorption are determined to be in the range of 104 and 117 kJ mol−1, which increases with decreasing COad coverage.

Graphical abstract: Temperature effects on CO adsorption/desorption at Pt film electrodes: an electrochemical in situ infrared spectroscopic study

Article information

Article type
Paper
Submitted
08 Feb 2010
Accepted
18 May 2010
First published
26 Jul 2010

Phys. Chem. Chem. Phys., 2010,12, 10888-10895

Temperature effects on CO adsorption/desorption at Pt film electrodes: an electrochemical in situ infrared spectroscopic study

B. Geng, J. Cai, S. Liang, S. X. Liu, M. F. Li and Y. Chen, Phys. Chem. Chem. Phys., 2010, 12, 10888 DOI: 10.1039/C002665D

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