Experimental indications for the existence of different states of palladium(0) at the surface of carbon paste electrodes |
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| Institution: | 1. Department of Chemistry, University of Trás-os-Montes e Alto Douro, 5001-801 Vila Real, Portugal;2. CQ-VR, University of Trás-os-Montes e Alto Douro, 5001-801 Vila Real, Portugal;3. Department of Physics and CICECO - Aveiro Institute of Materials, University of Aveiro, 3810-193 Aveiro, Portugal;4. Department of Chemistry, University of Minho, Gualtar, 4710-057 Braga, Portugal;5. CICS – Health Sciences Research Center and Chemistry Department, University of Beira Interior, 6201-001 Covilhã, Portugal |
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| Abstract: | The deposition and dissolution of palladium(0) at non-modified carbon paste electrode (CPE) is studied in aqueous chloride solution. During the dissolution one or two Pd oxidation peaks are observed at + 0.1 V and about + 0.45 V vs. SCE, indicating the existence of different states of Pd0 at the CPE. In accordance with the experimental results it is assumed that a palladium monolayer is formed when low amounts of Pd are deposited and that multilayers are formed in the case of larger amounts of deposited palladium. The formation of a metal monolayers at CPE is described for the first time. |
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