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Borate adsorption at Pt(111) in acidic medium

I. Specific adsorption

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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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Acknowledgement

A. A. El-Shafei is grateful to Japan Society of Promotion of Science (JSPS) for financial support during his stay at Catalysis Research Center, Hokkaido University, Sapporo Japan.

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  1. Akiko Aramata

    Present address: 1-5-3 Hiragishi, Sapporo, 062-0931, Japan

Authors and Affiliations

  1. Department of Chemistry, Faculty of Science, El-Mansoura University, El-Mansoura, 35516, Egypt

    A. A. El-Shafei

  2. Catalysis Research Center, Hokkaido University, Sapporo, Japan

    Akiko Aramata

Authors
  1. A. A. El-Shafei
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  2. Akiko Aramata
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Correspondence to A. A. El-Shafei.

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El-Shafei, A.A., Aramata, A. Borate adsorption at Pt(111) in acidic medium. J Solid State Electrochem 11, 430–433 (2007). https://doi.org/10.1007/s10008-006-0157-4

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  • DOI: https://doi.org/10.1007/s10008-006-0157-4

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