Journal
ELECTROCHIMICA ACTA
Volume 191, Issue -, Pages 705-715Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2016.01.064
Keywords
nickel sulfide; grapheme; self-assembly; hierarchical structure; supercapacitor
Categories
Funding
- Shanghai Leading Academic Discipline Project [J51503]
- Shanghai Municipal Education Commission (Plateau Discipline Construction Program)
- National Natural Science Foundation of China [20976105]
- Shanghai Association for Science and Technology Achievements Transformation Alliance Program [LM201559]
- Shanghai Municipal Education Commission boosting project [15cxy39]
- Science and Technology Commission of Shanghai Municipality Project [14520503200]
- Shanghai Talent Development Funding [201335]
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Graphene-coupled flower-like nickel sulfide monoliths that exhibit ultra-light, mesoporous structures and uniform particle sizes are successfully prepared using an F127-assisted hydrothermal method and high-temperature pyrolysis. As an electrode material for supercapacitors, the as-prepared rGO-Ni3S2 shows ultra-high specific capacitances of 1315 and 1050 F g(-1) at 1 and 10 A g(-1), respectively. After 1000 charge/discharge cycles at a current density of 1 A g(-1), the specific capacitance increases by almost 15%, indicating the excellent capacitance and durability of rGO-Ni3S2. Further, an asymmetric supercapacitor using rGO-Ni3S2 as positive electrode and active carbon as negative electrode exhibits high specific capacitance of 104.6 F g(-1) at 0.5 A g(-1), and excellent cycling stability with 85.6% capacitance retention after 5000 cycles at a current density of 4 A g(-1). These promising supercapacitor performances demonstrate that the as-developed surfactant-assisted hydrothermal strategy can be widely used to prepare graphene-coupled metal sulfides for high-performance supercapacitor applications. (C) 2016 Elsevier Ltd. All rights reserved.
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