Journal
JOURNAL OF MATERIALS CHEMISTRY A
Volume 3, Issue 34, Pages 17811-17819Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c5ta04176g
Keywords
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Funding
- National Natural Science Foundation of China [51371106]
- Specialized Research Fund for Doctoral Program of Higher Education of China [20120131110017]
- Young Tip-top Talent Support Project (the Organization Department of the Central Committee of the CPC)
- Institute of Materials of Ruhr University Bochum
- Alexander von Humboldt Foundation (Germany)
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Rechargeable lithium ion batteries (LIBs) have transformed portable electronics and will play a crucial role in transportation, such as electric vehicles. For higher energy storage in LIBs, two issues should be addressed, that is, the fundamental understanding of the chemistry taking place in LIBs and the discovery of new materials. Here we design and fabricate two-dimensional (2D) WS2 nanosheets with preferential [001] orientation and perfect single crystalline structures. Being used as an anode for LIBs, the WS2-nanosheet electrode exhibits a high specific capacity, good cycling performance and excellent rate capability. Considering the controversy in the lithium storage mechanism of WS2, ex-situ X-ray diffraction (XRD), Raman and X-ray photoelectron spectroscopy (XPS) analyses clearly verify that the recharge product (3.0 V vs. Li+/Li) of the WS2 electrode after fully discharging to 0.01 V (vs. Li+/Li) tends to reverse to WS2. More remarkably, the [001] preferentially-oriented 2D WS2 nanosheets are also promising candidates for applications in photocatalysis, water splitting, and so forth.
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