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Modified Electrodeposited Cobalt Foam Coatings as Sensors for Detection of Free Chlorine in Water

1
Department of Physical Chemistry, Vilnius University, Naugarduko str. 24, LT-03225 Vilnius, Lithuania
2
Institute of Applied Physics, Academiei str. 5, MD-2028 Chisinau, Republic of Moldova
*
Author to whom correspondence should be addressed.
Coatings 2019, 9(5), 306; https://doi.org/10.3390/coatings9050306
Received: 30 March 2019 / Revised: 29 April 2019 / Accepted: 6 May 2019 / Published: 8 May 2019
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Abstract

Metal foams offer a substantial specific surface area and sturdy frame, which makes them great candidates for various applications such as catalysts, sensors, heat sinks, etc. Cobalt and its various compounds are being considered as a cheaper alternative for precious and rare metal catalysts. The cobalt foams have been electrodeposited under galvanostatic and current pulse modes; the porous surface was created using a dynamic hydrogen bubble template. In order to obtain the highest porosity, four different solutions were tested, as well as a wide current density window (0.6–2.5 A/cm²), in addition many different combinations of pulse durations were applied. The effects of surfactant (isopropanol) on porosity were also investigated. The morphology of obtained foams was examined by SEM coupled with EDS, and XRD spectroscopy. True surface area was estimated based on the values of a double electric layer capacitance that was extracted from EIS data. Cobalt foams were modified using K3[Fe(CN)6] solution and cyclic voltammetry to form a cobalt hexacyanoferrate complex on the foam surface. In order to find optimal modification conditions, various potential scan rates and numbers of cycles were tested as well. Free chlorine sensing capabilities were evaluated using chronoamperometry. View Full-Text
Keywords: cobalt; electrodeposition; metal foams; cobalt hexacyanoferrate; free chlorine detection cobalt; electrodeposition; metal foams; cobalt hexacyanoferrate; free chlorine detection
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Vainoris, M.; Tsyntsaru, N.; Cesiulis, H. Modified Electrodeposited Cobalt Foam Coatings as Sensors for Detection of Free Chlorine in Water. Coatings 2019, 9, 306.

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