Nanometric MgFe₂O₄: Synthesis, characterization and its application towards supercapacitor and electrochemical uric acid sensor

In this paper, we have synthesized nanocrystalline MgFe₂O₄ (S1) by auto-combustion assisted sol-gel method. The structure and morphology and elemental study of S1 are examined by powder X-ray diffraction (PXRD), field emission scanning electron microscopic (FESEM) and energy dispersive X-ray spectroscopic (EDS) techniques. The FESEM images reveal that the morphology of the sample is rough and average particle size is 50 nm. The PXRD study indicates that the samples are well crystalline and single phase in nature. Moreover, we have performed supercapacitor study by electrochemical galvanostatic charge-discharge (GCD) measurement, which shows pseudo capacitive behavior. S1 contains a high specific capacitance of 428.9 Fg^-1 at the current density 0.0625 Ag^-1 and can deliver high energy and power density of 18.01 Wh kg^-1 and 21468 Wkg^-1 respectively. Moreover, uric acid (UA) sensing study has also been performed by cyclic voltmetry (CV) and electrochemical impedance spectroscopy measurement (EIS) of S1. We can use nanocrystalline MgFe₂O₄ as supercapacitor and UA sensor applications purpose.