Infrared study of adsorbed species on electrodes: Adsorption of carbon monoxide on Pt,Rh and Au |
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Affiliation: | 1. College of Physics and Information Technology, Shaanxi Normal University, Xian 710062, Shaanxi, PR China;2. Department of Medical Engineering and Technology, Xinjiang Medical University, Urumqi 830011, Xinjiang, PR China;3. College of Physics and Mechanical and Electronic Engineering, Xian University of Arts and Science, Xian 710065, Shaanxi, PR China;1. Department of Chemistry and Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials, Fudan University, Shanghai 200438, China;2. State Key Laboratory for Mesoscopic Physics, Frontiers Science Center for Nano-optoelectronics, School of Physics, Peking University, Beijing 100871, China;3. School of Materials Science and Engineering, Nanyang Technological University, Singapore 639798, Singapore;1. School of Chemical Engineering, The University New South Wales Sydney, Kensington, NSW 2052, Australia;2. School of Chemistry and Molecular Biosciences, The University of Queensland, St. Lucia, QLD 4072, Australia;3. Illinois Materials Research Laboratory, The University of Illinois at Urbana-Champaign, Urbana, IL 61801, USA;4. School of Chemical and Biomolecular Engineering, The University of Sydney, Camperdown, NSW 2006, Australia |
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Abstract: | Infrared spectra of adsorbed species at the solid/aqueous electrolyte interface are reported, following the adsorption of CO on platinum, rhodium and gold electrodes using in situ electrochemically modulated IR spectroscopy. Similarities exist with the corresponding solid-gas interfaces, i.e:- (1)a linearly bonded species is formed absorbing near 2080 cm−1 on Pt, 2030 cm−1 on Rh and 2120 cm−1 on Au;
- (2)bridged bonded or multibonded CO species are also present and detected at 1860 cm−1 (Pt), 1900 cm−1 (Rh) and 1930 cm−1 (Au);
- (3)CO2 produced by CO oxidation is detected near 2360 cm−1 at potentials as low as 0.35 V (vs. SHE).
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