Electrochemical Properties of Platinum Electrodes in Vitro: Comparison of Six Different Surface Qualities

Platinum serves as electrode material since several decades because of its excellent corrosion resistance and acceptable phase boundary impedance and charge injection capacity. Here, we investigate how the electrochemical performance of platinum is improved by different methods of surface roughening. By using a small signal model, it was calculated that depending on the surface treatment - the effective electrode surface can be enlarged by a factor of 76. However, pulse tests indicate for the identical electrode treatment an increase in charge injection capacitance by a factor of only 11.

[1]  S.F. Cogan.  In vivo and In vitro Differences in the Charge-injection and Electrochemical Properties of Iridium Oxide Electrodes , 2006, 2006 International Conference of the IEEE Engineering in Medicine and Biology Society.

[2]  E. Schmidt,et al.  "Safe" charge-injection waveforms for iridium oxide (AIROF) microelectrodes , 2003, Annual International Conference of the IEEE Engineering in Medicine and Biology Society.

[3]  G J Suaning,et al.  Fabrication of implantable microelectrode arrays by laser cutting of silicone rubber and platinum foil , 2005, Journal of neural engineering.

[4]  Andreas Hierlemann,et al.  Impedance characterization and modeling of electrodes for biomedical applications , 2005, IEEE Transactions on Biomedical Engineering.

[5]  James D. Weiland,et al.  In vitro electrical properties for iridium oxide versus titanium nitride stimulating electrodes , 2002, IEEE Transactions on Biomedical Engineering.