Journal
ELECTROCHIMICA ACTA
Volume 222, Issue -, Pages 1604-1615Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2016.11.146
Keywords
Reflux condensation mediated deposition; Co3O4 nanosheets; ZnFe2O4 nanoflakes; Asymmetric supercapacitor
Categories
Funding
- UGC, New Delhi [41-249/2012 (SR), 41-370/2012 (SR)]
- UGC-SAP, RGSTC, BRNS, Mumbai
- Ministry of Science and Technology, R.O.C. [MOST 105-2119-M-011-002]
- DST-FIST, PURSE
- UGC-BSR Meritorious Students Fellowship
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A facile, scalable, economic and binder free reflux condensation mediated deposition strategy is reported for the direct growth of cobalt oxide (Co3O4) nanosheets (positive electrode) and zinc ferrite (ZnFe2O4) nanoflakes (negative electrode) on a highly conducting flexible stainless steel mesh (SSM, 300 mesh) for the first time. Both the electrodes show supercapbattery properties. Individually, Co3O4 nanosheet electrode exhibits a maximum specific capacitance of 2083 F g(-1) (specific charge capacity 312 mAh g(-1)) at a high current density of 5 mA cm(-2) and also shows excellent cycle stability with 89% retention after 6000 cycles. On other hand, ZnFe2O4 nanoflakes electrode demonstrates a maximum specific capacitance of 923 F g(-1) (specific charge capacity 2100 mAh g(-1)) at 5 mA cm(-2) current density with 94% capacitance retention after 9000 cycles. The electrodes are used for fabricating flexible solid state asymmetric supercapacitor. Interestingly, the fabricated device exhibits higher cycle stability up to 12,000 cycles with only 2% loss in capacitance retention and delivers a maximum energy density of 36 Wh kg(-1) even at a high power density of 8.8 kW kg(-1). This work reports novel alternative synthetic strategy which could be extended to other metal oxides providing new scientific insights and avenues. (C) 2016 Elsevier Ltd. All rights reserved.
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