Electrochemical sensors including electrode systems with increased oxygen generation

  • US 7,108,778 B2
  • Filed: 07/21/2004
  • Issued: 09/19/2006
  • Est. Priority Date: 07/25/2003
  • Status: Active Grant
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First Claim
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1. An electrochemical sensor for determining a presence or a concentration of an analyte in a fluid, the sensor comprising:

  • a membrane system comprising an enzyme that reacts with the analyte;

    a first working electrode comprising a conductive material, wherein the first working electrode is configured to measure a product of the reaction of the enzyme with the analyte; and

    an auxiliary electrode comprising a conductive material, wherein the auxiliary electrode is configured to generate oxygen; and

    a counter electrode comprising a conductive material, wherein the counter electrode is configured to reduce oxygen so as to balance current being generated by the first working electrode,wherein the auxiliary electrode is located at a proximity to the counter electrode such that oxygen generated at the auxiliary electrode diffuses to the counter electrode to be reduced thereby.

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