LOW-ENERGY ELECTRON-DIFFRACTION AND VOLTAMMETRY OF CARBON-MONOXIDE ELECTROSORBED ON PT(111)

被引:81
作者
ZURAWSKI, D [1 ]
WASBERG, M [1 ]
WIECKOWSKI, A [1 ]
机构
[1] UNIV ILLINOIS,SCH CHEM SCI,DEPT CHEM,URBANA,IL 61801
关键词
D O I
10.1021/j100368a064
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
The organization of carbon monoxide electrosorbed at various coverages on a Pt(111) single-crystal electrode has been studied by using ex situ characterization by low-energy electron diffraction. Two CO structures, (√3 × 3)rect and c(√3 × 5)rect, have been identified for saturation and partial coverage, respectively. A third structure, c(4 × 2), was observed after prolonged exposure of a saturation coverage of CO to the UHV environment. The packing density of electrosorbed CO attained at saturation coverage is higher than that observed in gas-phase research for CO adsorbed at room temperature; however, it is comparable with the maximum coverage attained for low-temperature gas-phase adsorption. The appearance of the c(√3 × 5)rect structure at all partial coverages of electrosorbed CO has been interpreted as being indicative of the formation of islands of this high-coverage structure in the electrochemical environment. Current-potential profiles obtained for partial coverages exhibit two distinguishable peaks which have been attributed to the oxidation of CO adsorbed in different sites within the adlattice. Through a correlation of the voltammetric results, the organizational information obtained from LEED measurements, and structures proposed by gas-phase researchers, the two current peaks have been assigned to CO adsorbed in c(4 × 2) domains and in high-density fault lines bordering these domains. © 1990 American Chemical Society.
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页码:2076 / 2082
页数:7
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