Characterization of iron-containing clay modified electrodes and their applications for the detection of hydrogen peroxide and ascorbic acid

Suh Ching Shyu, Chong Mou Wang

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Clays containing ruthenium purple (denoted clay/RP) were prepared and characterized by diffuse-reflectance ultraviolet-visible absorption spectroscopic and electrochemical methods. The characteristics of the clay-modified electrodes with or without RP were obtained and compared. The clay/RP electrodes displayed a remarkable ability for detection of hydrogen peroxide and ascorbate. When H2O2 or ascorbic acid was present, the current response was dramatically enhanced and tended to a limiting value, leading to a linear relationship with the bulk activity of the substrate. The rate constants (pseudo-first-order) were determined from Δi/io vs. v-1 plots and calculated to be 530 M-1 s-1 (pH 3.3) for H2O2, and 150 M-1 s-1 (pH 4) for ascorbic acid. Flow injection analysis showed that the detection limits for both substances were about 1 ppm at pH 5. Oxygen reduction causes little interference with the detection of H2O2, and this was tentatively ascribed to unfavorable electron transfer between oxygen and clay/RP particles.

Original languageEnglish
Pages (from-to)3419-3425
Number of pages7
JournalJournal of the Electrochemical Society
Issue number10
Publication statusPublished - 1997 Oct


ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Renewable Energy, Sustainability and the Environment
  • Surfaces, Coatings and Films
  • Electrochemistry
  • Materials Chemistry

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