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Charge Injection from Chronoamperometry of Platinum Electrodes for Bionic Devices

Journal Article


Abstract


  • The chronoamperometric response of platinum under biologically relevant conditions was investigated to understand how charge

    transfer across the electrode-tissue interface occurs during potential pulsing. Platinum behaves as a non-ideal electrode, passing

    capacitance and faradaic charge. The faradaic reactions are associated with oxide formation and removal, hydrogen and anion

    adsorption. The capacitance charge decayed within μs while the faradaic charge decay occurred over longer times. The total charge

    and the ratio of faradaic to capacitance charge was seen to vary with time, potential, electrode size, oxygen concentration, electrolyte

    and surface cleaning method. The charge transfer mechanisms result in an accumulation of charge during multiple potential pulses,

    mostly reductive charge under the conditions presented here. This modifies the composition of the electrode/solution interface. An

    accurate understanding of charge transfer at the electrode/tissue interface must subsequently be obtained under biologically relevant

    conditions (an artificial perilymph with low oxygen concentration for cochlear implants electrodes and artificial cerebrospinal fluid

    for neural implants) and with appropriate clinical electrodes.

Authors


  •   Harris, Alexander R. (external author)
  •   Newbold, Carrie (external author)
  •   Carter, Paul (external author)
  •   Cowan, Robert (external author)
  •   Wallace, Gordon G.

Publication Date


  • 2018

Citation


  • Harris, A. R., Newbold, C., Carter, P., Cowan, R. & Wallace, G. G. (2018). Charge Injection from Chronoamperometry of Platinum Electrodes for Bionic Devices. Journal Of The Electrochemical Society, 165 (12), G3033-G3041.

Scopus Eid


  • 2-s2.0-85067496485

Start Page


  • G3033

End Page


  • G3041

Volume


  • 165

Issue


  • 12

Place Of Publication


  • United States

Abstract


  • The chronoamperometric response of platinum under biologically relevant conditions was investigated to understand how charge

    transfer across the electrode-tissue interface occurs during potential pulsing. Platinum behaves as a non-ideal electrode, passing

    capacitance and faradaic charge. The faradaic reactions are associated with oxide formation and removal, hydrogen and anion

    adsorption. The capacitance charge decayed within μs while the faradaic charge decay occurred over longer times. The total charge

    and the ratio of faradaic to capacitance charge was seen to vary with time, potential, electrode size, oxygen concentration, electrolyte

    and surface cleaning method. The charge transfer mechanisms result in an accumulation of charge during multiple potential pulses,

    mostly reductive charge under the conditions presented here. This modifies the composition of the electrode/solution interface. An

    accurate understanding of charge transfer at the electrode/tissue interface must subsequently be obtained under biologically relevant

    conditions (an artificial perilymph with low oxygen concentration for cochlear implants electrodes and artificial cerebrospinal fluid

    for neural implants) and with appropriate clinical electrodes.

Authors


  •   Harris, Alexander R. (external author)
  •   Newbold, Carrie (external author)
  •   Carter, Paul (external author)
  •   Cowan, Robert (external author)
  •   Wallace, Gordon G.

Publication Date


  • 2018

Citation


  • Harris, A. R., Newbold, C., Carter, P., Cowan, R. & Wallace, G. G. (2018). Charge Injection from Chronoamperometry of Platinum Electrodes for Bionic Devices. Journal Of The Electrochemical Society, 165 (12), G3033-G3041.

Scopus Eid


  • 2-s2.0-85067496485

Start Page


  • G3033

End Page


  • G3041

Volume


  • 165

Issue


  • 12

Place Of Publication


  • United States