期刊
ADVANCED FUNCTIONAL MATERIALS
卷 30, 期 34, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adfm.202003187
关键词
metal nanosheets; self-folding and rolling; Zn MS@C anode; Zn-ion batteries
类别
资金
- Singapore MOE AcRF Tier 2 [2017-T2-2-069, 2018-T2-01-010]
- National Research Foundation of Singapore (NRF) Investigatorship [NRF2016NRF-NRFI001-22]
- China Scholarship Council [201806370038]
2D metal nanosheets are attractive for various applications stemming from the intriguing characteristics related with their dimensionality; however, their effective and scalable preparation remains a great challenge. Herein, a scalable preparation process of relatively active metal nanosheets (e.g., Zn, Al, and Cu) with the thickness down to several nanometers at low cost is demonstrated, which involves an initial self-folding-rolling step followed by the subsequent ultrasonication to exfoliate them without any etching step. The native oxide on the surface of the metals, which acts as a barrier between the adjacent metal layers, plays a special role in enabling the successful preparation of 2D metal nanosheets. As a demonstration for their practicability, a hierarchical Zn anode, which is constructed by the Zn microsheets coated with carbon (Zn MS@C) via in situ carbonization of carboxymethylcellulose (CMC) binder, is successfully implemented as anode for rechargeable aqueous Zn-ion batteries. When applied in symmetrical battery, the Zn MS@C delivers a long lifespan of over 800 h at 0.2 mA cm(-2)with a capacity of 0.1 mA h cm(-2). Importantly, the full battery of MnO2 || Zn MS@C also performs a high discharge capacity of 217.4 mA h g(-1)after 140 cycles at 300 mA g(-1).
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