Impedance Characterization and Modeling of Electrodes for Biomedical Applications

A low electrode-electrolyte impedance interface is critical in the design of electrodes for biomedical applications. To design low-impedance interfaces a complete understanding of the physical processes contributing to the impedance is required. In this work a model describing these physical processes is validated and extended to quantify the effect of organic coatings and incubation time. Electrochemical impedance spectroscopy has been used to electrically characterize the interface for various electrode materials: platinum, platinum black, and titanium nitride; and varying electrode sizes: 1 cm2, and 900 microm2. An equivalent circuit model comprising an interface capacitance, shunted by a charge transfer…

• TA
  Texas A and M University
• BW
  Branco Weiss Fellowship – Society in Science
• EK
  Eberhard Karls Universität Tübingen
• ET
  Eidgenössische Technische Hochschule Zürich