Revealing Pseudocapacitive Mechanisms of Metal Dichalcogenide SnS2/Graphene-CNT Aerogels for High-Energy Na Hybrid Capacitors

Jiang Cui, Shanshan Yao, Ziheng Lu, Jian Qiu Huang, Woon Gie Chong, Francesco Ciucci, Jang Kyo Kim

Research output: Contribution to journalArticlepeer-review

142 Scopus citations

Abstract

SnS2 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 SnS2 anodes in Na-ion batteries (SIBs) and Na hybrid capacitors (SHCs). Herein, SnS2 nanoplatelets are grown directly on SnO2/C composites to synthesize SnS2/graphene-carbon nanotube aerogel (SnS2/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 SnS2/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 SnS2 nanoplatelets and ultrafast Na+ ion intercalation into the SnS2 layers.

Original languageBritish English
Article number1702488
JournalAdvanced Energy Materials
Volume8
Issue number10
DOIs
StatePublished - 5 Apr 2018

Keywords

  • first-principle calculations
  • graphene-CNT aerogels
  • in situ TEM
  • Na hybrid capacitors
  • SnS

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