期刊
COATINGS
卷 9, 期 5, 页码 -出版社
MDPI
DOI: 10.3390/coatings9050306
关键词
cobalt; electrodeposition; metal foams; cobalt hexacyanoferrate; free chlorine detection
资金
- Horizon 2020 research and innovation program under MSCA-RISE-2017 [778357]
- Research Lithuanian Council project [09.3.3-LMT-K-712-08-0003]
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/cm(2)), 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 K-3[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.
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