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Issue 36, 2010
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Temperature effects on CO adsorption/desorption at Pt film electrodes: an electrochemical in situ infrared spectroscopic study

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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

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Publication details

The article was received on 08 Feb 2010, accepted on 18 May 2010 and first published on 26 Jul 2010


Article type: Paper
DOI: 10.1039/C002665D
Citation: Phys. Chem. Chem. Phys., 2010,12, 10888-10895
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    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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