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Revealing Pseudocapacitive Mechanisms of Metal Dichalcogenide SnS<sub>2</sub>/Graphene‐CNT Aerogels for High‐Energy Na Hybrid Capacitors

Jiang CuiDepartment of Mechanical and Aerospace Engineering The Hong Kong University of Science and Technology Clear Water Bay Hong Kong P. R. ChinaShanshan YaoDepartment of Mechanical and Aerospace Engineering The Hong Kong University of Science and Technology Clear Water Bay Hong Kong P. R. ChinaZiheng LuDepartment of Mechanical and Aerospace Engineering The Hong Kong University of Science and Technology Clear Water Bay Hong Kong P. R. ChinaJianqiu HuangDepartment of Mechanical and Aerospace Engineering The Hong Kong University of Science and Technology Clear Water Bay Hong Kong P. R. ChinaWoon Gie ChongDepartment of Mechanical and Aerospace Engineering The Hong Kong University of Science and Technology Clear Water Bay Hong Kong P. R. ChinaFrancesco CiucciDepartment of Chemical and Biomolecular Engineering The Hong Kong University of Science and Technology Hong Kong P. R. ChinaJang‐Kyo KimDepartment of Mechanical and Aerospace Engineering The Hong Kong University of Science and Technology Clear Water Bay Hong Kong P. R. China

2017en

ABI

Annotatsiya

Abstract SnS 2 nanoplatelet electrodes can offer an exceptionally high pseudocapacitance in an organic Na + ion electrolyte system, but their underlying mechanisms are still largely unexplored, hindering the practical applications of pseudocapacitive SnS 2 anodes in Na‐ion batteries (SIBs) and Na hybrid capacitors (SHCs). Herein, SnS 2 nanoplatelets are grown directly on SnO 2 /C composites to synthesize SnS 2 /graphene‐carbon nanotube aerogel (SnS 2 /GCA) by pressurized sulfidation where the original morphology of carbon framework is preserved. The composite electrode possessing a large surface area delivers a remarkable specific capacity of 600.3 mA h g −1 at 0.2 A g −1 and 304.8 mA h g −1 at an ultrahigh current density of 10 A g −1 in SIBs. SHCs comprising a SnS 2 /GCA composite anode and an activated carbon cathode present exceptional energy densities of 108.3 and 26.9 W h kg −1 at power densities of 130 and 6053 W kg −1 , respectively. The in situ transmission electron microscopy and the density functional theory calculations reveal that the excellent pseudocapacitance originates from the combination of Na adsorption on the surface/Sn edge of SnS 2 nanoplatelets and ultrafast Na + ion intercalation into the SnS 2 layers.

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Identifikatorlar

DOI: 10.1002/aenm.201702488

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