首页|Selectively designed hierarchical copper-cobalt oxysulfide nanoarchitectures for high-rate hybrid supercapacitors
Selectively designed hierarchical copper-cobalt oxysulfide nanoarchitectures for high-rate hybrid supercapacitors
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NSTL
Elsevier
? 2022 Elsevier B.V.Rational design of metal oxide-sulfide-based composite electrode materials with multi-functional nanoarchitectures, high electrochemical conductivity, and superior redox activity have attracted extensive attention in high-rate hybrid supercapacitors. Herein, the hierarchical binder-free copper-cobalt oxysulfide (Cu0.33Co0.67OxSy) nanoarchitectures with flower-like nanosheets and nanoplates are facilely synthesized on Ni-foam for hybrid supercapacitors using a simple and low-cost wet chemical method. The Cu0.33Co0.67OxSy-NFs demonstrated a high specific capacity of 193 mAh/cm2 (443.9 μAh/cm2) at current density of 3 mA cm? 2, with excellent cycling performance of 95 % even after 3000 charge-discharge cycles. In addition, an aqueous hybrid device was assembled using prepared Cu0.33Co0.67OxSy-NFs as positive and porous carbon as negative electrode, which demonstrated benchmark for energy storage properties. Specifically, the assembled device exhibited a high energy density of 0.33 mWh/cm2 and a power density of 2.1 mW/cm2 with high capacity retention (91 % after 5000 cycles at 20 mA cm?2). In view of practical applicability, the assembled hybrid devices can be able to power up a small wind fan for a long duration. The cost-effective single-step approach in designing high-performance cathode materials in this study provide a strategy for the design and manufacture of other ternary metal oxysulfides for high-performance energy storage devices.
Electrochemical activityEnergy densityHybrid supercapacitorsNanoflowersTernary transition metal oxysulfides
Pallavolu M.R.、Goli H.R.、Kumar Y.A.、Naushad M.、Sambasivam S.、Sreedhar A.
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School of Chemical Engineering Yeungnam University
Department of Physics Banasthali University
Department of Physics United Arab Emirates University
Department of Chemistry College of Science King Saud University
National Water and Energy Center United Arab Emirates University
NSTL
Elsevier
