Journal
ADVANCED MATERIALS
Volume 30, Issue 15, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adma.201705523
Keywords
lithiation; delithiation synthesis; rechargeable Li-O-2 batteries; silicene
Categories
Funding
- National Research Foundation (NRF), Prime Minister's Office, Singapore, under the Campus for Research Excellence and Technological Enterprise (CREATE) program
- academic research fund AcRF tier 2, Ministry of Education, Singapore [M4020246, ARC10/15]
- College of Engineering, Nanyang Technological University, Singapore
- [M4081887]
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Silicene has recently received increasing interest due to its unique properties. However, the synthesis of silicene remains challenging, which limits its wide applications. In this work, a top-down lithiation and delithiation process is developed to prepare few layer silicene-like nanosheets from ball-milled silicon nanopowders. It is found that delithiation solvent plays a critical role in the structure evolution of the final products. The use of isopropyl alcohol renders 2D silicene-like products 30-100 nm in length and approximate to 2.4 nm in thickness. The electrochemical characterization analysis suggests that the product shows high performance for rechargeable Li-O-2 batteries with 73% energy efficiency and high stability. The top-down synthesis strategy proposed in this work not only provides a new solution to the challenging preparation issue of few layer silicene but also demonstrates the feasibility of producing 2D materials from nonlayered starting structures.
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