| Title |
Grafito veltinio modifikavimas kobaltu |
| Another Title |
The modification of graphite felt with cobalt. |
| Authors |
Macijauskienė, B ; Griškonis, E ; Jezerskaitė, A |
| DOI |
10.5755/j01.ct.60.2.1891 |
| Full Text |
|
| Is Part of |
Cheminė technologija.. Kaunas : KTU. 2012, Nr. 2, p. 31-36.. ISSN 1392-1231. eISSN 2029-719X |
| Abstract [eng] |
The feasibility of electrochemical modification of graphite felt fiber surface with cobalt was investigated under galvanostatic conditions in a simple cobalt electrodeposition bath containing Co2+ ions and boric acid as a buffering agent. Electroless cobalt deposition on the sensitized (with Sn2+ ions) and activated (with Pd) surface of a graphite felt fibre was carried out in a pyrophosphate bath containing hypophosphite as a reducing agent. The composition and structure of electrodeposited and electrolles cobalt on the surface of modified graphite felt were confirmed by the EDS and XRD analysis. The atomic concentration of Co on the surface of graphite felt fibres electrochemically and chemically modified with cobalt was about 0.3% and 3.4%, respectively. Such concentration of Co is sufficient for the modified graphite felt to interact with a permanent magnet. The morphology of electrodeposited and electrolles cobalt on the graphite felt fiber surface was demonstrated by SEM analysis. The nanometric surface elements (globular, flake-like, and needle-like crystallites) of cobalt were observed on the surface of modified graphite felt fibres. It should be noted that a proper pretreatment in NaOH and HCl solutions increases the quality and wettability of graphite felt fibre surface, and it is a necessary operation before an electrochemical and chemical modification of graphite felt with cobalt. |
| Published |
Kaunas : KTU |
| Type |
Journal article |
| Language |
Lithuanian |
| Publication date |
2012 |
| CC license |
|
