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Effect of crystallinity on supercapacitance property of transition metal ferrites
( Richard Appiah-ntiamoah ),김헌,( Bekelcha Tesfaye Gadisa ) 한국공업화학회 2019 한국공업화학회 연구논문 초록집 Vol.2019 No.1
Transition metal ferrites (MFe2O4, M= Co, Ni, Zn) have emerged as excellent electrode materials for supercapacitor application because of their ease of synthesis, stability, abundance and benign nature. The transformation of MFe2O4 surface into oxyhydroxides (MFe2O4@M(Fe)OOH) under anodic potential is crucial to achieve high capacitive performance. In this study, we investigate how the degree of crystallinity in MFe2O4 affects the ease of MFe2O4@M(Fe)OOH formation and capacitance of MFe2O4 . Thermal annealing conditions (i.e. time (Tt) and temperature (T)) were tuned to control the crystallinity in MFe2O4. This was monitored using XRD, SAED and HR-TEM analysis. These methods were also used to elucidate MFe2O4 transformation into MFe2O4@M(Fe)OOH under anodic potential. Our results show a direct correlation between crystallinity and supercapacitance performance. These findings could theoretically be applied to improve the supercapacitance of other metal-oxide based electrodes.