Anion re-adsorption and displacement at platinum single crystal electrodes in CO-containing solutions |
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| Institution: | 1. Instituto de Química de São Carlos, Universidade de São Paulo, CP 780, CEP 13560-970, São Carlos, SP, Brazil;2. Instituto de Electroquímica, Universidad de Alicante, Apdardo 99, E-03080 Alicante, Spain;1. Department of Applied Chemistry, School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, China;2. McNair Technology Company Limited, Dongguan City, Guangdong 523700, China;1. Department of Chemical Engineering and Materials Science, Yuan Ze University, Taoyuan 320, Taiwan;2. Materials and Electro-Optics Research Division, National Chung-Shan Institute of Science & Technology, Taoyuan 325, Taiwan |
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| Abstract: | Bulk CO oxidation experiments have been carried out in sulphuric and perchloric acid solutions on Pt(1 1 1) and Pt(1 1 0) electrodes under hanging meniscus rotating disk electrode (HMRDE) configuration. The comparison between the two different electrolytic media reveals an important influence of the anion in the oxidation kinetics. Once the adsorbed CO layer has been oxidized after the ignition peak, anions are re-adsorbed on the electrode surface and the presence of these anions affects the stationary currents measured at positive potentials. In the negative-going sweep, adsorbed anions are displaced from the surface when the CO oxidation rate is lower than the corresponding CO adsorption rate. The charge associated to this displacement has been measured at high scan rates and is in agreement with that expected from the CO displacement experiments performed at low potentials. |
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