Journal
SMALL
Volume 17, Issue 34, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/smll.202102263
Keywords
2D materials; grinding-promoted intercalation exfoliation; MoS; (2) nanosheets; potassium-ion battery
Categories
Funding
- National Natural Science Foundation of China [61875090, 91833306, 21304049, 21674049]
- Science Fund for Distinguished Young Scholars of Jiangsu Province of China [BK20150041]
- Fifth 333 Project of Jiangsu Province of China [BRA2019080]
- Key Giant Project of Jiangsu Educational Committee [19KJA180005]
- 1311 Talents Program of Nanjing University of Posts and Telecommunications (Dingshan)
- Six Talent Plan of Jiangsu Province [2016XCL050]
- Postgraduate Research & Practice Innovation Program of Jiangsu Province [SJCX17_0244]
- European Union [823717-ESTEEM3]
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A new exfoliation method using grinding-promoted intercalation exfoliation (GPIE) was presented to prepare MoS2-CNC nanocomposites, which showed impressive performance as anode materials for potassium-ion batteries. The method efficiently exfoliates MoS2 nanosheets and produces the nanocomposites in water, opening up a new avenue for high-performance device applications.
Efficient exfoliations of bulk molybdenum disulfide (MoS2) into few-layered nanosheets in pure phase are highly attractive because of the promising applications of the resulted 2D materials in diversified optoelectronic devices. Here, a new exfoliation method is presented to prepare semiconductive 2D hexagonal phase (2H phase) MoS2-cellulose nanocrystal (CNC) nanocomposites using grinding-promoted intercalation exfoliation (GPIE). This method with facile grinding of the bulk MoS2 and CNC powder followed by conventional liquid-phase exfoliation in water can not only efficiently exfoliate 2H-MoS2 nanosheets, but also produce the 2H-MoS2/CNC 2D nanocomposites simultaneously. Interestingly, the intercalated CNC sandwiched in MoS2 nanosheets increases the interlayer spacing of 2H-MoS2, providing perfect conditions to accommodate the large-sized ions. Therefore, these nanocomposites are good anode materials of potassium-ion batteries (KIBs), showing a high reversible capacity of 203 mAh g(-1) at 200 mA g(-1) after 300 cycles, a good reversible capacity of 114 mAh g(-1) at 500 mA g(-1), and a low decay of 0.02% per cycle over 1500 cycles. With these impressive KIB performances, this efficient GPIE method will open up a new avenue to prepare pure-phase MoS2 and promising 2D nanocomposites for high-performance device applications.
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