NiCo2S4 nanoparticles//activated balsam pear pulp for asymmetric hybrid capacitors

CrystEngComm Pub Date: 2016-03-01 DOI: 10.1039/C6CE00319B

Abstract

Cauliflower-like NiCo2S4 nanoparticles (NPs) for use as battery-type materials have been synthesized via a simple one-step route solvothermal method with thioacetamide (TAA) as the sulfur source. The synthesis of the Ni–Co precursors and the S2? anion exchange reactions occur at the same time, which is time-effective and cost-effective compared to other methods. The obtained NiCo2S4 NPs display very competitive electrochemical performance (a specific capacitance of 2480 F g?1 is achieved at a current density of 0.5 A g?1, excellent rate capability with 68% of the original capacitance remained at 10 A g?1 and ideal cycle stability with 80% capacitance remained after 3000 cycles) with high mass-loading (5 mg cm?2). In addition, low-cost activated balsam pear pulp (ABPP) is developed as a capacitor-type carbon material for supercapacitors with ideal electrochemical performances. The asymmetric hybrid capacitors (AHCs) are further assembled into pouch cells using battery-type NiCo2S4 NPs as the positive electrode, capacitor-type ABPP as the negative electrode and flexible carbon papers as the current collector. The AHCs demonstrate high power density (3.52 kW kg?1 at an energy density of 3.72 Wh kg?1) and cycle stability (72.4% after 9000 cycles).

Graphical abstract: NiCo2S4 nanoparticles//activated balsam pear pulp for asymmetric hybrid capacitors
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