Polyhedral ternary oxide FeCo2O4: A new electrode material for supercapacitors

In this study, Fe-Co-ZIF(iron and cobalt in the ZIF-67) with an earlier shape of ZIF-67 was synthesized successfully. After thermal treatment, the Fe-Co-ZIF precursor was turned into FeCo2O4 with polyhedral morphology. A comparative analysis was made with pure ZIF-67 oxide, finding its great improvement in the electrochemical performance. The FeCo2O4 showed a specific capacity of 510 F g(-1) (52.42 mAh g(-1)) at 1 A g(-1) in 1.0 M KOH electrolyte, while it was only 273 F g(-1) (28.1 mAh g(-1)) for pure ZIF-67 oxide Co3O4. The FeCo2O4 cycle life increased from 52.1% to 75.5%. These data suggested that this ternary oxide FeCo2O4 with polyhedral morphology could be used for supercapacitors. (C) 2017 Elsevier B.V. All rights reserved.