期刊
MATERIALS TODAY ENERGY
卷 7, 期 -, 页码 10-17出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.mtener.2017.11.004
关键词
Layered disulfides; MoS2; Metallic 1T phase; Energy storage; Supercapacitor
资金
- National Basic Research Program of China [2014CB239702]
- National Natural Science Foundation of China [21501120, 21371121, 21331004]
- Science and Technology Commission of Shanghai Municipality [17ZR1441200, 14DZ2250800]
Metallic 1T layered disulfides ultrathin layers fabricated by the chemical exfoliation of 2H bulk via top-down method are highly attractive for energy storage because of their special metallic characteristics. However, the spontaneous transformation of 1T phase to the thermodynamically stable 2H phase is detrimental to electrochemical performance. In contrast to alkali metals, transition metals can efficiently stabilize 1T layered disulfides due to their stronger ionic potential and polarizability. Herein, Co stabilized metallic 1T MoS2 monolayers with largely distorted structure (1T(d) Co-MoS2) are designed and synthesized via a bottom-up method, in which Co exists on the surface of S-Mo-S monolayers via Co-S bonds, rather than substituting Mo. Its unique structure endows the improved thermal stability and higher conductivity over pristine 1T MoS2, and the obtained materials exhibit an enhanced specific capacitance of 454 F g(-1) (similar to 100 F g(-1) of pristine 1T MoS2) at 0.5 A g(-1) and a long cyclic stability with the capacitance retention of approximately 100% even after 25,000 cycles at 10 A g(-1). (C) 2017 Elsevier Ltd. All rights reserved.
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