期刊
CARBON
卷 194, 期 -, 页码 10-22出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.carbon.2022.03.054
关键词
Cycling stable supercapacitors; Graphene shells; CNTs bridges and spacers; Transition metal sul fides; Conductive interlinked nanostructure
资金
- Basic Research Field of Shanghai Science and Technology Innovation Program [21XD1401400]
- Science Fund for Outstanding Young Scholar [U1733130]
- National Natural Science Foundation of China [2020YFC1910200]
- National Key Research and Development Program of China
Transition metal sulfides have high theoretical capacity for energy storage but suffer from poor cycling performance. A new Co3S4/C conductive network with nitrogen-doped graphene and carbon nanotubes showed excellent electrochemical properties, with a specific capacitance of 1158 F g(-1) at 1 A g(-1), rate capability of 86% at 10 A g(-1), and 97.2% capacitive retention after 4000 cycles. The designed nanostructure paves the way for improved TMSs in energy storage materials synthesis.
Transition metal sulfides (TMSs) have become promising candidates as electrode materials in energy storage fields thanks to the high theoretical capacity. However, their application is hindered by depressed electrical conductivity and poor cycling performance. Herein, we proposed a ZIF-67 derived, nitrogen doped, graphene-coated and carbon nanotubes-interlinked 3D Co3S4/C conductive network (N-Co3S4- GN/CNT) for high-performance supercapacitors. Through controlling the mass ratio of ZIF-67, melamine and g-Co3S4, various microstructures with determined electrochemical performance could be achieved. The nanocomposites synthesized with the ingredient mass ratio of 2: 1: 1 (NCSC-211) were proven to have the most excellent comprehensive electrochemical properties. In the NCSC-211 nanostructure, multi-layer graphene function as conductive shells for improved cycling performance by alleviating pulverization caused by volume change, thick CNTs act as conductive bridges and agglomeration spacers that increase electron conductivity and provide more active sites for redox reaction and doped-nitrogen offer enhanced wettability to electrolyte and faster electron transfer. The NCSC-211 electrode displayed specific capacitance of 1158 F g(-1) at 1 A g(-1), rate capability of 86% at 10 A g(-1) and extraordinary cycling stability with 97.2% capacitive retention after 4000 cycles. Furthermore, the assembled asymmetric supercapacitor NCSC-211//activated carbon exhibited energy density of 43.73/37.69 Wh kg(-1) at power density of 800/8000 W kg(-1) and capacity retention of 95.3% after 5000 cycles at 5 A g(-1). The designing strategy of in-situ grown instead of additional added conductive phase that fully-covered and stronglyinterlinked network nanostructure may pave the road towards TMSs in synthesizing energy storage materials by compensating their intrinsic drawbacks. (C)& nbsp;2022 Elsevier Ltd. All rights reserved.
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