In situ FTIR studies of coadsorption of CN(-) and CO on Pt(110) electrode surface
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The coadsorption of CN(-) and CO on Pt(1 1 0) electrode in acid solutions was investigated by using cyclic voltammetry and in situ FTIR spectroscopy. In comparison with individual adsorption of CO or CN-, the onset oxidation potential of CO (CO(ad)) coadsorbed with CN(-) is positively shifted ca. 100 mV, and its oxidation peak is postponed ca. 260 mV together with a significant decrease in current density. When the coadsorbed CO has been stripped completely, the CV recovers the feature of Pt(1 1 0)/CN(-) surface, which signifies that the coadsorption of CO does not affect the oxidation behavior of the coadsorbed CN(-) (CN(ad)(-)) comparison of CN(-) and CO adsorbed alone, the CN(ad)(-) band is blue shifted from 2090 to 2108 cm(-1) at 0.0 V, and the stark tuning rate is decreased dramatically from 53 to 4 cm(-1) V(-1); while the CO(ad) band is red shifted from 2075 to 2064 cm(-1) at 0.0 V, and the stark tuning rate is slightly decreased from 24 to 19 cm(-1) V(-1). The result revealed the strong interaction between CN(ad)(-) and CO(ad) at Pt(1 1 0) surface in the coadsorption system. (C) 2011 Elsevier B.V. All rights reserved.
CitationJOURNAL OF ELECTROANALYTICAL CHEMISTRY，2011,662（1）：137-142