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

• DOI: 10.1002/aenm.201702488
• Publication Date: 2017-12-27T08:50:38Z
• Authors: Jiang Cui; Shanshan Yao; Ziheng Lu; Jian‐Qiu Huang; Woon Gie Chong; Francesco Ciucci; Jang‐Kyo Kim
• Keywords: Pseudocapacitance; Carbon fibers

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