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Electrochemical Impedance Spectroscopic Analysis of RuO2 Based Thick Film pH Sensors

Manjakkal, Libu; Djurdjic, Elvira; Cvejin, Katarina; Kulawik, Jan; Zaraska, Krzysztof; Szwagierczak, Dorota


Elvira Djurdjic

Katarina Cvejin

Jan Kulawik

Krzysztof Zaraska

Dorota Szwagierczak


The conductimetric interdigitated thick film pH sensors based on RuO2 were fabricated and their electrochemical reactions with solutions of different pH values were studied by electrochemical impedance spectroscopy (EIS) technique. The microstructural properties and composition of the sensitive films were examined by scanning electron microscopy, X-ray energy dispersive spectroscopy and Raman spectroscopy. The EIS analysis of the sensor was carried out in the frequency range 10 mHz–2 MHz for pH values of test solutions 2–12. The electrical parameters of the sensor were found to vary with changing pH. The conductance and capacitance of the film were distinctly dependent on pH in the low frequency range. The Nyquist and Bode plots derived from the impedance data for the metal oxide thick film pH sensor provided information about the underlying electrochemical reactions.


Manjakkal, L., Djurdjic, E., Cvejin, K., Kulawik, J., Zaraska, K., & Szwagierczak, D. (2015). Electrochemical Impedance Spectroscopic Analysis of RuO2 Based Thick Film pH Sensors. Electrochimica Acta, 168, 246-255.

Journal Article Type Article
Acceptance Date Apr 8, 2015
Online Publication Date Apr 9, 2015
Publication Date 2015-06
Deposit Date Jul 20, 2022
Journal Electrochimica Acta
Print ISSN 0013-4686
Publisher Elsevier
Peer Reviewed Peer Reviewed
Volume 168
Pages 246-255
Keywords Electrochemistry; General Chemical Engineering
Public URL