Journal
SMALL
Volume 16, Issue 43, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/smll.202004178
Keywords
1T MoS2; full cells; hollow polyhedrons; N-doped carbon nanotubes; potassium-ion storage
Categories
Funding
- National Natural Science Foundation of China [41573096, 21707064, 11775138, 41473089]
- program for Changjiang Scholars and Innovative Research Team in University [IRT_17R71]
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Enslaved to the large-size K-ions, the construction of suitable anode materials with superior and stable potassium-ion storage properties is a major challenge. 1T phase MoS(2)possesses higher conductivity, bigger interlayer distance, and more electrochemically active sites than the 2H phase, which offers intriguing benefits for energy-related applications. In this work, the 1T/2H-phase hybrid MoS(2)nanosheets are successfully anchored in the N-doped carbon nanotube hollow polyhedron (1T/2H-MoS2/NCNHP) by a bottom-up solvothermal method. For the synthesized 1T/2H-MoS2/NCNHP, the fewer-layer 1T/2H-MoS(2)nanosheets are embedded in an N-doped carbon nanotube hollow polyhedron, with an enlarged interlayer spacing of 0.96 nm. When evaluated as anode material for potassium-ion batteries, the 1T/2H-MoS2/NCNHP hybrid presents outstanding potassium storage performance. It delivers a high-specific capacity of 519.2 mAh g(-1)at 50 mA g(-1)and maintains 281.2 mAh g(-1)at 1 A g(-1)over 500 cycles. The good potassium-ion electrochemical performance is attributed to the rational structural design and the synergistic effect of the components. Moreover, the 1T-MoS(2)nanosheet has excellent electrical conductivity and its enlarged interlayer spacing reduces the barrier for the embedding and stripping of K ions. Finally, the practical application of the 1T/2H-MoS2/NCNHP electrode material is also evaluated by assembled K-ion full cells.
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