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Ruthenium/rhodium modified gold electrodes for the amperometric detection of hydrogen peroxide at low potentials

Dirk Janasek1, Walter Vastarella, Uwe Spohn

  • 1Institute of Biotechnology, Martin-Luther-University Halle-Wittenberg, Kurt-Mothes-Strasse 3, Germany.

Analytical and Bioanalytical Chemistry
|December 11, 2002
PubMed

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Membrane electrodes, also known as p-ion electrodes, use membranes that selectively interact with free analyte ions, generating a potential difference across the membrane. The resulting membrane potential, known as the asymmetry potential, is not zero even when analyte concentrations on both sides of the membrane are equal. The membrane's response is typically not selective to a single analyte but proportional to the concentration of all ions in the sample solution capable of interacting at the...
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For electrode reversibility to be maintained, all the reactants and products involved in the half-reaction must be present at the electrode. There are several types of reversible electrodes (half-cells).In metal-metal-ion electrodes, a metal balances electrochemically with a solution of its own ions. Examples are Cu2+|Cu and Zn2+|Zn. Metals that react with the solvent, like group 1 and most group 2 metals, which react with water, and zinc, which reacts with aqueous acidic solutions, cannot be...