Construct hierarchical electrode with Ni<inf>x</inf>Co<inf>3-x</inf>S<inf>4</inf>nanosheet coated on NiCo<inf>2</inf>O<inf>4</inf>nanowire arrays grown on carbon fiber paper for high-performance asymmetric supercapacitors
- Publication Type:
- Journal Article
- Journal of Power Sources, 2017, 359 pp. 262 - 269
- Issue Date:
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© 2017 Elsevier B.V. In order to boost the energy density of supercapacitors, the strategy of using advanced pseudo-capacitive electrode and asymmetric device architecture is feasible and effective. Herein, we report a significant advance in the design and synthesis of a new hierarchically nanostructures with a series of controllable Ni/Co molar ratios of NixCo3-xS4(i.e., NiCo2S4and Ni2CoS4) nanosheets coatings have in situ grown on NiCo2O4nanowires arrays on a flexible carbon fiber paper (CFP). Remarkably, the hybrid Ni2CoS4@NiCo2O4composite electrode delivers the highest discharge gravimetric capacitance of 1501 F g−1, and areal capacitance of 1.86 F cm−2at 1 mA cm−2. Furthermore, coupled with nitrogen-doped carbon xerogels anode, we have fabricated a 1.6 V asymmetric supercapacitor (Ni2CoS4@NiCo2O4//nitrogen-doped carbon xerogels), such device delivers a maximum energy and power densities of 32.2 Wh kg−1and 2.5 kW kg−1in 1.0 M KOH electrolyte, respectively, and an excellent cycling stability (∼87.6% retention after 10,000 cycles).
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