期刊
ACS NANO
卷 11, 期 10, 页码 10599-10607出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsnano.7b06133
关键词
NbS2 nanosheets; oil phase; Li storage; Na storage; conversion reaction mechanism
类别
资金
- Natural Science Foundation of China [51472122, 51772152]
- PAPD of Jiangsu, Singapore
- MOE AcRF [RG113/15, 2016-T1-002-065]
- Singapore EMA project EIRP [12/NRF2015EWT-EIRP002-008]
- China Scholarship Council (CSC)
Transition metal (M = Fe, Co, Ni) and Se codoped two-dimensional uniform NbS2 (MxNb1-xS2-ySey) nanosheets were synthesized via a facile oil-phase synthetic process. The morphology of MxNb1-xS2-ySey can be adjusted by tuning the amount of metal and Se introduced into NbS2. Among them, the optimized Fe0.3Nb0.7S1.6Se0.4 nanosheets, with lateral sizes of 1-2 mu m and approximately 5 urn thick, achieve the best Li-ion and Na-ion storage properties. For example, the Fe0.3Nb0.7S1.6Se0.4 nanosheets depict excellent rate capabilities with fifth-cycle specific capacities of 461.3 mAh g(-1) at 10 A g(-1) for Li storage and 136 mAh g(-1) at 5 A g(-1) for Na storage. More significantly, ultralong cyclic stabilities were achieved with reversible specific capacities of 444 mAh g(-1) at 5 A g(-1) during the 3000th cycle for Li storage and 250 mAh g(-1) at 1 A g(-1) during the 750th cycle for Na storage. Post-treatment high-resolution transmission electron microscopy was studied to prove that the reversible Li-ion storage in NbS2 was based on a conversion reaction mechanism.
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