STRUCTURAL AND ELECTROCHEMICAL PROPERTIES OF Fe-DOPED NiAl2O4 OXIDE
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 therma...
| Main Authors: | , |
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| Format: | Article |
| Language: | English |
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El Oued University
2018-12-01
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| Series: | Journal of Fundamental and Applied Sciences |
| Subjects: | |
| Online Access: | http://www.jfas.info/index.php/JFAS/article/view/117 |
| Summary: | 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.
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| ISSN: | 2588-1914 1112-9867 |