STRUCTURAL AND ELECTROCHEMICAL PROPERTIES OF Fe-DOPED NiAl2O4 OXIDE

• Main Authors: W. Tibermacine, M. Omari
• Format: Article
• Language: English
• Published: El Oued University 2018-12-01
• Series: Journal of Fundamental and Applied Sciences
• Subjects: Spinel oxide, Sol-gel, Powder diffraction, Thermal analysis, Oxygen evolution reaction.
• Online Access: http://www.jfas.info/index.php/JFAS/article/view/117

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.