期刊
CHEMICAL ENGINEERING JOURNAL
卷 375, 期 -, 页码 -出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2019.121981
关键词
Quantum dots; Pyridine ligands; Induced electron cloud distribution; Electrochemical energy storage; Synchronously increased specific capacity and stability
资金
- National High Technology Research and Development Program of China [2015AA050602]
- External Cooperation Program of BIC, Chinese Academy of Sciences [GJHZ1607]
- Major/Innovative Program of Development Foundation of Hefei Center for Physical Science and Technology [2016FXZY003]
The structural collapse of transition metal sulfides in repeated charge and discharge process restricts their cyclic performance. How to effectively remedy stability without sacrifice of capacity still remains a daunting challenge. Herein, ultra-small NiS2 quantum dots (QDs) are assembled with pyridine ligands containing heterocyclic nitrogen atoms of high electronegativity. The induction of electron cloud of heterocyclic nitrogen shortens the NieS bond with stronger structural stability. Besides, the localized lone pair of electrons near nickel atoms reduces the repulsive force to the diffused OH- ions, thus increasing affinity of the redox reaction. Benefiting from the tailor-made of ligands and size effect of QDs, a great promotion in both specific capacity of 651.8 C.g(-1) at 1 A.g(-1) and stability of 94.7% retention at 5 A.g(-1) over 8000 cycles is achieved as compared to ordinary bulk materials. These results demonstrate that ligands induced QDs is a promising strategy for precisely regulating metal sulfide electrode materials of advanced energy storage devices.
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