Kinetic studies of reduction of nitrate ions at Sn-modified Pt electrodes using a quartz crystal microbalance |
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Authors: | Keijiro Tada Katsuaki Shimazu |
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Institution: | Division of Material Science, Graduate School of Environmental Earth Science, Hokkaido University, Kita 10 Nishi 5, Sapporo 060-0810, Japan |
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Abstract: | An electrochemical quartz crystal microbalance (EQCM) was used to determine the surface coverage of adsorbed nitrate during the reduction of nitrate on Sn-modified Pt electrodes. The rate equation was derived as a function of the surface coverage of nitrate, the concentration of hydronium ion and the electrode potential for an electrode with a tin coverage of ca. 0.35, which showed the highest activity of the electrodes reported so far. N2 (30%) and were produced. From the Tafel slope at a constant surface coverage (?0.115 V decade?1) and the reaction orders (1.1 and 0.94 with respect to the surface coverage of the adsorbed nitrate and the concentration of hydronium ion, respectively), it is concluded that the rate-determining step is the reaction of the adsorbed nitrate with the hydronium ion and an electron. |
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Keywords: | Tin/platinum electrocatalyst Nitrate reduction Quartz crystal microbalance |
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