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- Title
Ni--MoO<sub>2</sub> composite cathodes for hydrogen evolution in alkaline solution. Effect of aging of the electrolyte for their electrodeposition.
- Authors
JOVIC, VLADIMIR D.; LACNJEVAC, ĆUROŠ C.; JOVIĆ, BORKA M.; GAJIĆ-KRSTAJIĆ, LJILJANA M.; KRSTAJIĆ, NEDELJKO V.
- Abstract
In this work, the effect of aging of the electrolyte in the electrodeposition of Ni--MoO2 composite coatings on their morphology (scanning electron microscopy), chemical composition (energy-dispersive X-ray spectroscopy), polarization characteristics and "service life", tested for the hydrogen evolution reaction (HER) in 32 mass % NaOH at 90 °C, was investigated. Polarization characteristics and results of the "service life" test of Ni--MoO2 composite coatings obtained after different aging periods of the electrolyte for deposition (suspension of MoO2 powder particles in a solution containing 2 M NH4Cl + + 0.2 M NiCl2) were compared with that recorded for the commercial De Nora's Ni+RuO2 cathode coating (DN). It was shown that aging of the electrolyte did not influence the morphology and chemical composition of Ni--MoO2 composite coatings electrodeposited under conditions simulating their industrial production, while the polarization characteristics for the HER were influenced. The best coating, obtained after 180 days of electrolyte aging, showed a completely different (layered) structure of the deposit and significantly better performance than the commercial DN electrode during the "service life" test.
- Subjects
MOLYBDENUM oxides; CATHODES; HYDROGEN evolution reactions; ALKALINE solutions; ELECTROLYTES; ELECTROPLATING
- Publication
Journal of the Serbian Chemical Society, 2013, Vol 78, Issue 5, p689
- ISSN
0352-5139
- Publication type
Article
- DOI
10.2298/JSC120831112J