Diffusion, Adsorption and Electrode Kinetics of Electro-oxidatons on a Stationary Solid Electrode

BOZAL PALABIYIK B., KURBANOĞLU S., USLU B., ÖZKAN S. A., Zuman P.

ELECTROANALYSIS, cilt.28, sa.12, ss.2947-2955, 2016 (SCI-Expanded) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 28 Sayı: 12
  • Basım Tarihi: 2016
  • Doi Numarası: 10.1002/elan.201600372
  • Dergi Adı: ELECTROANALYSIS
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Sayfa Sayıları: ss.2947-2955
  • Anahtar Kelimeler: Adsorption, diffusion, electro-oxidation, solid electrode, unusual i-E curves, PARKINSONS-DISEASE, DOPED-DIAMOND, SCHIZOPHRENIA
  • Ankara Üniversitesi Adresli: Evet

Özet

The i-E oxidation curves, obtained using a boron doped diamond electrode, for studies of oxidations of two piperazine derivatives ARIP (I) and PIRI (II), resulted in a sharp increase of current in the range of the oxidation potentials. After reaching a value, depending on concentration of I or II, the current remains practically constant up to +1.6 V. Such limiting currents i(1) are a linear function of concentrations and depend on the v(1/2). Hence it is diffusion controlled, shifts of the oxidation potentials indicate, that the monoprotonated forms are oxidized. At more negative potentials a limiting current i(2) occurs, due to the oxidation of the diprotonated form. Current i(2) increases with decreasing pH in a shape of a part of a dissociation curve. Diffusion control reflects the large size of molecules I and II. The two-electron oxidations yield a C=N bond in the piperazine ring. It seems to be the first reported diffusion controlled oxidation curves obtained on a stationary solid electrode.