Activated Carbon as a Pseudo-reference Electrode for Potentiometric Sensing Inside Concrete

Conference Paper (2014)
Author(s)

Y. Abbas (University of Twente)

Farhad Pargar (TU Delft - Microlab)

W Olthuis (University of Twente)

A. van den Berg (University of Twente)

Research Group
Microlab
Copyright
© 2014 Y. Abbas, F. Pargar, W Olthuis, A. van den Berg
DOI related publication
https://doi.org/10.1016/j.proeng.2014.11.717
More Info
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Publication Year
2014
Language
English
Copyright
© 2014 Y. Abbas, F. Pargar, W Olthuis, A. van den Berg
Research Group
Microlab
Volume number
87
Pages (from-to)
1437-1440
Reuse Rights

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Abstract

The half-cell potential of the Activated carbon (AC), due to its high double layer capacitance (EDL), remains stable in high ionic electrolyte. The open circuit potential (OCV) of the AC, with EDL of 40 – 50 F, shows a stable potential (10 mV variation) over two weeks in the cement pore solution (sat. Ca(OH)2). The OCV is less sensitive to the pH change from pH 8 to 12 (range inside concrete). The potentiometric response of a Ag/AgCl vs. AC pseudo-reference shows a near-Nernstian response (-51 mV/decade). The AC electrode can be proposed as a pseudo-reference for the potentiometric monitoring inside concrete.