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Ternary Transition Metal Sulfides Embedded in Graphene Nanosheets as Both the Anode and Cathode for High-Performance Asymmetric Supercapacitors

Owing to their low electronegativity, excellent electrical conductivity, high specific capacitance, and rich electrochemical redox sites, various transition metal sulfides have attracted significant attention as promising pseudocapacitive electrode materials for supercapacitors. However, their relatively poor electrical conductivity and large volume changes seriously hinder their commercial applications. Herein, ternary Co0.33Fe0.67S2 nanoparticles are in situ embedded between graphene nanosheets through a facile one-step hydrothermal approach to form a sandwich-like composite. Because of its unique and robust structure, the graphene nanosheet/Co0.33Fe0.67S2 composite (GCFS-0.33) exhibits a high specific capacitance (310.2 C g–1 at 2 mV s–1) and superb rate capability (61.8% at 200 mV s–1) in 3 M KOH aqueous electrolyte. Using transition metal sulfides simultaneously as both positive and negative electrodes, for the first time, an aqueous asymmetric supercapacitor (ASC) was fabricated with the GCFS-0.33 c...

Authors:   Wei Liu; Hao Niu; Jiao Yang; Kui Cheng; Ke Ye; Kai Zhu; Guiling Wang; Dianxue Cao; Jun Yan
Journal:   Chemistry of Materials
Year:   2018
DOI:   10.1021/acs.chemmater.7b04976
Publication date:   19-Jan-2018
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