STRUCTURAL AND ELECTROCHEMICAL PROPERTIES OF Fe-DOPED NiAl2O4 OXIDE
| Autor: | W. Tibermacine, M. Omari |
|---|---|
| Jazyk: | English<br />French |
| Rok vydání: | 2018 |
| Předmět: | |
| Zdroj: | Journal of Fundamental and Applied Sciences, Vol 11, Iss 1 (2018) |
| Druh dokumentu: | article |
| ISSN: | 2588-1914 1112-9867 |
| DOI: | 10.4314/jfas.v11i1.15 |
| Popis: | A new spinel solid solution system of Ni1-xFexAl2O4 (0.0 ≤ x ≤ 0.5) was synthesized through sol-gel method. The effect of Fe doping on the nickel aluminate prepared was investigated. The synthesized powders were characterized by means of X-ray diffraction, thermogravimetric and differential thermal analysis, fourier transform infrared spectroscopy, scanning electron microscopy and electrochemical measurements. From the preceding analysis, it can be shown that compounds show a single spinel phase in the temperature range 650-1000°C and the solubility of iron in the NiAl2O4 structure was limited to samples with the iron content x < 0.6. The electrochemical measurements indicate that the catalytic activity is strongly influenced by iron doping. The highest electrode performance is achieved with Ni0.7Fe0.3Al2O4 (i=86.84 mA/cm2) which is ~ 27 times greater than that of NiAl2O4 ( i=3.22 mA/cm2) at E= +0.8V. After one hundred cycles, the stability of the doped electrode with 30% of iron is much better than the undoped electrode. |
| Databáze: | Directory of Open Access Journals |
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