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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16 Citations (Scopus)

Abstract

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
Volume144
Issue number10
DOIs
Publication statusPublished - 1997 Oct

Fingerprint

ascorbic acid
Ascorbic acid
hydrogen peroxide
Hydrogen peroxide
Hydrogen Peroxide
Ascorbic Acid
clays
Clay
Iron
iron
Electrodes
acids
electrodes
Oxygen
Ruthenium
oxygen
ruthenium
Rate constants
electron transfer
plots

ASJC Scopus subject areas

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

Cite this

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abstract = "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.",
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AU - Shyu, Suh Ching

AU - Wang, Chong Mou

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N2 - 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.

AB - 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.

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