Hydrogen and anion adsorption at platinum single crystal electrodes in phosphate solutions over a wide range of pH

Shen Ye, Hideaki Kita, Akiko Aramata

研究成果: Article査読

54 被引用数 (Scopus)

抄録

The adsorption of hydrogen and anions at platinum single crystal, mainly Pt(111), electrodes in phosphate buffer solution was studied by electrochemical and in-situ FTIR measurements over a wide range of pH and potential. Phosphoric acid and its anions behaved essentially similarly to sulphuric acid, being different from perchloric acid. The weakly adsorbed hydrogen was not affected by the kind of anions and pH. Strongly adsorbed hydrogen on Pt(111) split into two parts at pH = ca. 5. These two parts united again at pH > 12, giving the same peak (P0,1) as observed in 0.1 M NaOH. A potential shift in the positive direction past the double layer region caused a change of the adsorbed PO43- to the protonated adsorbate, HPO42- at high pH and of the adsorbed HPO42- to H2 PO4- at neutral pH, respectively. Comparison of the electrochemical results with the in-situ FTIR results suggested the importance of adsorbed OH in the change of the adsorbed phosphate species. The effect of the surface structure was not significant for phosphate adsorption.

本文言語English
ページ(範囲)299-312
ページ数14
ジャーナルJournal of Electroanalytical Chemistry
333
1-2
DOI
出版ステータスPublished - 1992 7 25
外部発表はい

ASJC Scopus subject areas

  • 分析化学
  • 化学工学(全般)
  • 電気化学

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