Investigation of Pt, Ti, TiN and Nano-porous Carbon Electrodes for Implantable Cardioverter-Defibrillator Applications
2004 (English)In: Electrochimica Acta, ISSN 0013-4686, E-ISSN 0019-4686, Vol. 49, no 22-23, 4011-4020 p.Article in journal (Refereed) Published
The electrochemical behavior and stability of Pt, Ti, TiN, and nano-porous carbon for implantable cardioverter-defibrillator (ICD) electrode application were investigated in a phosphate buffered saline solution. The electrochemical interfacial proper-ties were examined by electrochemical impedance spectroscopy, and the potential and current response during ICD shock pulses were recorded by a digital oscilloscope. Changes in surface composition and structure were investigated using X-ray photoelectron spectroscopy and environmental scanning electron microscopy. When exposed to anodic 700 V shock pulses with duration of 10 ms, only Pt was stable, nano-porous carbon electrode was slightly attacked, whereas Ti and TiN electrodes suffered severe degradation. Upon cathodic shock pulsing, all the materials were stable, but Ti and TiN electrodes with a smooth surface showed evidence of hydrogen adsorption. Porous and rough electrodes produced less gas evolution compared to a smooth surfaces, due to a higher amount of charge transferred through non-Faradaic processes. The reason for this could be higher interfacial capacity due to the large surface area.
Place, publisher, year, edition, pages
2004. Vol. 49, no 22-23, 4011-4020 p.
Electrical shock pulse, Electrochemical degradation, Implantable cardioverter-defibrillator, Nano-porous carbon, Rough TiN
IdentifiersURN: urn:nbn:se:kth:diva-5061DOI: 10.1016/j.electacta.2003.11.040ISI: 000222818100043ScopusID: 2-s2.0-3042751098OAI: oai:DiVA.org:kth-5061DiVA: diva2:7744
QC 20100920 QC 20110916. 54th Annual ISE Meeting. Sao Pedro, BRAZIL. SEP 01-05, 20032005-04-252005-04-252011-10-17Bibliographically approved