Surface Electrochemistry of CO on Reconstructed Gold Single Crystal Surfaces Studied by Infrared Reflection Absorption Spectroscopy and Rotating Disk Electrode

The electrooxidation of CO has been studied on reconstructed gold single-crystal surfaces by a combination of electrochemical (EC) and infrared reflection absorption spectroscopy (IRAS) measurements. Emphasis is placed on relating the vibrational properties of the CO adlayer to the voltammetric and other macroscopic electrochemical responses, including rotating disk electrode measurements of the catalytic activity. The IRAS data show that the C−O stretching frequencies are strongly dependent on the surface orientation and can be observed in the range 1940−1990 cm-1 for the 3-fold bridging, 2005−2070 cm-1 for the 2-fold bridging, and 2115−2140 for the terminal position. The most complex CO spectra are found for the Au(110)-(1 × 2) surface, i.e., a band near 1965 cm-1, with the second, weaker band shifted positively by about 45 cm-1 and, finally, a weak band near 2115 cm-1. While the C−O stretching frequencies for a CO adlayer adsorbed on Au(111)-(1 × 23) show νCO bands at 2029−2069 cm-1 and at 1944−1986 cm-1, on the Au(100)-"hex" surface a single CO band is observed at 2004−2029 cm-1. In the "argon-purged" solution, the terminal νco band on Au(110)-(1 × 2) and the 3-fold bridging band on the Au(111)-(1 × 23) disappear entirely. The IRAS/EC data show that the kinetics of CO oxidation are structure sensitive; i.e., the onset of CO oxidation increases in the order Au(110)-(1 × 2) ≥ Au(100)-"hex" > Au(111)-(1 × 23). Possible explanations for the structure sensitivity are discussed.      «

The electrooxidation of CO has been studied on reconstructed gold single-crystal surfaces by a combination of electrochemical (EC) and infrared reflection absorption spectroscopy (IRAS) measurements. Emphasis is placed on relating the vibrational properties of the CO adlayer to the voltammetric and other macroscopic electrochemical responses, including rotating disk electrode measurements of the catalytic activity. The IRAS data show that the C−O stretching frequencies are strongly dependent on...     »

Adsorbed substances (CO and reconstructed gold single crystal surfaces in electrochem. oxidn. study) Oxidation kinetics (electrochem. of CO on reconstructed gold single crystal surfaces in HClO4 soln. studied by IR reflection absorption spectroscopy and rotating disk electrode) IR spectra (in CO electrochem. oxidn. on reconstructed gold single crystal surfaces in HClO4 soln.) Oxidation (of CO on reconstructed gold single crystal surfaces in HClO4 soln. studied by IR reflection absorption spectroscopy and rotating disk electrode) Interfacial structure (reconstructed electrochem. oxidn. of CO on reconstructed gold single crystal surfaces in HClO4 soln. studied by IR reflection absorption spectroscopy and rotating disk electrode) surface electrochem carbon monoxide gold IR reflection absorption spectroscopy electrooxidn carbon monoxide reconstructed gold single crystal surface     «

Adsorbed substances (CO and reconstructed gold single crystal surfaces in electrochem. oxidn. study) Oxidation kinetics (electrochem. of CO on reconstructed gold single crystal surfaces in HClO4 soln. studied by IR reflection absorption spectroscopy and rotating disk electrode) IR spectra (in CO electrochem. oxidn. on reconstructed gold single crystal surfaces in HClO4 soln.) Oxidation (of CO on reconstructed gold single crystal surfaces in HClO4 soln. studied by IR reflection absorption spectro...     »

CAN 141:267290 72-2 Electrochemistry Materials Sciences Division, Lawrence Berkeley National Laboratory, University of California, Berkeley, CA, USA. Journal 0002-7863 7440-57-5 (Gold) Role: DEV (Device component use), PRP (Properties), USES (Uses) (electrochem. oxidn. of CO on reconstructed gold single crystal surfaces in HClO4 soln. studied by IR reflection absorption spectroscopy and rotating disk electrode); 7601-90-3 (Perchloric acid) Role: NUU (Other use, unclassified), PRP (Properties), USES (Uses) (electrochem. oxidn. of CO on reconstructed gold single crystal surfaces in HClO4 soln. studied by IR reflection absorption spectroscopy and rotating disk electrode); 630-08-0 (Carbon monoxide) Role: PRP (Properties), RCT (Reactant), RACT (Reactant or reagent) (electrochem. oxidn. of CO on reconstructed gold single crystal surfaces in HClO4 soln. studied by IR reflection absorption spectroscopy and rotating disk electrode); 124-38-9P (Carbon dioxide) Role: PNU (Preparation, unclassified), PRP (Properties), PREP (Preparation) (prodn. in CO electrochem. oxidn. on reconstructed gold single crystal surfaces in HClO4 soln.)     «

CAN 141:267290 72-2 Electrochemistry Materials Sciences Division, Lawrence Berkeley National Laboratory, University of California, Berkeley, CA, USA. Journal 0002-7863 7440-57-5 (Gold) Role: DEV (Device component use), PRP (Properties), USES (Uses) (electrochem. oxidn. of CO on reconstructed gold single crystal surfaces in HClO4 soln. studied by IR reflection absorption spectroscopy and rotating disk electrode); 7601-90-3 (Perchloric acid) Role: NUU (Other use, unclassified), PRP (Properties),...     »