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Mo2C-induced solid-phase synthesis of ultrathin MoS2 nanosheet arrays on bagasse-derived porous carbon frameworks for high-energy hybrid sodium-ion capacitors

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Abstract

Conventional supercapacitors often suffer from low energy density. Hybrid Na-ion capacitors (NICs) are emerging as an important energy-storage device with high-energy and high-power output. They possess complementary merits of a high-capacity battery-type anode and a high-rate capacitive cathode. However, the existing anodes (e.g., carbon, TiO2, and Na2Ti2O5) are often limited by sluggish kinetics and low capacities of Na-ion storage. Here we report the fabrication of ultrathin MoS2 nanosheet arrays vertically anchored on bagasse-derived three-dimensional (3D) porous carbon frameworks (MoS2@BPC) as NIC anodes through a facile two-step solid-phase reaction strategy (BPC → Mo2C@BPC → MoS2@BPC). During the solid-phase synthesis process, the formation of Mo2C intermediates is the key to a successful growth of powder-type MoS2 nanosheet arrays on BPC. Meanwhile, the bagasse-derived porous cross-linked carbon structure can act as a 3D scaffold to effectively increase the conductivity, sodium-ion diffusion and structural stability of MoS2@BPC during charge–discharge processes. As a consequence, the MoS2@BPC electrode delivers a high specific capacity for Na-ion storage (490 mA h g−1 at 0.1 A g−1) with superior high-rate capability and cyclability (cycled over 5000 cycles at 2 A g−1). Coupled with BPC as the cathode, the hybrid electrode made of MoS2@BPC enables the NIC to deliver both high energy density (112.2 W h kg−1 at 55 W kg−1) and power density (8333 W kg−1 at 53.2 W h kg−1) as well as long cycling stability, which may bridge the supercapacitor–battery divide.

Graphical abstract: Mo2C-induced solid-phase synthesis of ultrathin MoS2 nanosheet arrays on bagasse-derived porous carbon frameworks for high-energy hybrid sodium-ion capacitors

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Publication details

The article was received on 17 May 2018, accepted on 04 Jul 2018 and first published on 04 Jul 2018


Article type: Paper
DOI: 10.1039/C8TA04597F
Citation: J. Mater. Chem. A, 2018, Advance Article
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    Mo2C-induced solid-phase synthesis of ultrathin MoS2 nanosheet arrays on bagasse-derived porous carbon frameworks for high-energy hybrid sodium-ion capacitors

    Y. Li, H. Wang, B. Huang, L. Wang, R. Wang, B. He, Y. Gong and X. Hu, J. Mater. Chem. A, 2018, Advance Article , DOI: 10.1039/C8TA04597F

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