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Articles by Isao TANIGUCHI
Total Records ( 2 ) for Isao TANIGUCHI
  Zekerya DURSUN , Sami BEN AOUN and Isao TANIGUCHI
  Au(111) single crystal electrodes were modified by underpotential deposition (UPD) of Cd ad-atoms with different coverages, which were used for the electrocatalytic oxidation of glucose in alkaline media. The catalytic activity of the electrodes was dependent on how the Cd ad-atoms covered the surface. Under the presented experimental conditions the monolayer (ML) Cd ad-atom-covered Au(111) electrode had the best catalytic activity on D-glucose oxidation, in terms of both potential shifts and peak current increases, as compared to the 0.11, 0.5, and 2 ML covered and bare Au(111) electrodes. Double layer capacity measurements revealed that the shifts of the potential of zero charge (pzc) were dependent on the different surface coverages of the Cd ad-atom-modified Au(111) electrodes, which is in good agreement with cyclic voltammetric results, as the current flow was initiated for glucose oxidation after a slightly more positive potential of pzc in all Cd ad-atom-modified Au(111) and bare Au(111) electrodes.
  Zekerya DURSUN , Levent PELIT and Isao TANIGUCHI
  A single-crystal Au(111) electrode was used for the simultaneous determination of dopamine (DA) and ascorbic acid (AA) in a phosphate buffer solution at pH 6.9. The single-crystal Au(111) electrode displayed excellent electrocatalytic activity for DA and AA oxidation in comparison to a Au disk electrode. Although the anodic peaks of both reagents overlapped on the Au disk electrode, the anodic peak potentials of DA and AA in their mixture were well separated since the peak potential of AA was shifted to more negative values by cyclic and differential pulse voltammetry. The oxidation peak current increased linearly with the concentration of DA in the range of 5 x 10-6-5 x 10-4 mol/L in the presence of 5 x 10-4 mol/L AA. The detection limit of DA was 5 x 10-7 mol/L. The peak current also linearly increased with increasing AA concentration in the presence of 5 x 10-4 mol/L DA in the range of 1 x 10-6-5 x 10-4 mol/L. The detection limit of AA was 5 x 10-8 mol/L (s/n = 3). The single-crystal Au(111) electrode showed excellent electrocatalytic activity to both AA and DA, probably because hydrogen flame treatment made the single-crystal electrode surface a well-defined atomic structure.
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