Effective area and charge density of iridium oxide neural electrodes

Harris, A, Paolini, A and Wallace, G 2017, 'Effective area and charge density of iridium oxide neural electrodes', Electrochimica Acta, vol. 230, pp. 285-292.


Document type: Journal Article
Collection: Journal Articles

Title Effective area and charge density of iridium oxide neural electrodes
Author(s) Harris, A
Paolini, A
Wallace, G
Year 2017
Journal name Electrochimica Acta
Volume number 230
Start page 285
End page 292
Total pages 8
Publisher Pergamon Press
Abstract The effective electrode area and charge density of iridium metal and anodically activated iridium has been measured by optical and electrochemical techniques. The degree of electrode activation could be assessed by changes in electrode colour. The reduction charge, activation charge, number of activation pulses and charge density were all strongly correlated. Activated iridium showed slow electron transfer kinetics for reduction of a dissolved redox species. At fast voltammetric scan rates the linear diffusion electroactive area was unaffected by iridium activation. At slow voltammetric scan rates, the steady state diffusion electroactive area was reduced by iridium activation. The steady state current was consistent with a ring electrode geometry, with lateral resistance reducing the electrode area. Slow electron transfer on activated iridium would require a larger overpotential to reduce or oxidise dissolved species in tissue, limiting the electrodes charge capacity but also reducing the likelihood of generating toxic species in vivo.
Subject Analytical Chemistry not elsewhere classified
Keyword(s) charge density
electrode area
Iridium oxide
neural electrode
voltammetry
DOI - identifier 10.1016/j.electacta.2017.02.002
Copyright notice © 2017 Elsevier Ltd. All rights reserved.
ISSN 0013-4686
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