Borate adsorption at Pt(111) in acidic medium |
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| Authors: | A. A. El-Shafei Akiko Aramata |
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| Affiliation: | (1) Department of Chemistry, Faculty of Science, El-Mansoura University, El-Mansoura, 35516, Egypt;(2) Catalysis Research Center, Hokkaido University, Sapporo, Japan;(3) Present address: 1-5-3 Hiragishi, Sapporo 062-0931, Japan |
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| Abstract: | The adsorption/desorption process of borate was studied at Pt(111) in acidic solution by cyclic voltammetry. A so-called butterfly wave in the cyclic voltammogram of Pt(111) in HClO4 shifted to negative direction upon the addition of boric acid with the disappearance of its sharp spikes. The shift in potential was found to be −57 mV with a tenfold increase of boric acid concentration. This illustrates that this anomalous wave is due to borate adsorption/desorption by a one-electron transfer process. The borate adsorption/desorption wave was observed to shift by −63 mV/pH. At pH>3, the anomalous wave splits forming two separate waves, depending on the pH and the scan rate. The appearance of two waves is assigned to the change in the adsorption mode of borate or the participation of OH in the adsorption process. |
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