期刊
NANOSCALE
卷 6, 期 12, 页码 6563-6568出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c4nr00533c
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资金
- Singapore National Research Foundation under NRF RF [NRF-RF2010-07]
- A*Star SERC PSF [1321202101]
- MOE [MOE2012-T2-2-049]
- Singapore MOE under AcRF [ARC 26/13, MOE2013-T2-1-034]
- AcRF [RG 61/12]
- Start-Up Grant in NTU [M4080865.070.706022]
- Singapore National Research Foundation
- Campus for Research Excellence and Technological Enterprise (CREATE) programme (Nanomaterials for Energy and Water Management)
We report a facile and controllable strategy for the fabrication of three-dimensional (3D) ZnCo2O4/NiO core/shell nanowire arrays (ZCO/NiO NWs) on nickel (Ni) foam substrates by a simple, cost-effective, two-step, solution-based method. Ultra-thin NiO nanosheets are revealed to grow uniformly on the porous ZnCo2O4 nanowires with many interparticle mesopores, resulting in the formation of 3D core/shell nanowire arrays with hierarchical architecture. In comparison with the pristine ZnCo2O4 nanowire arrays (ZCO NWs), the ZCO/NiO NWs exhibit significantly improved Li storage properties, in terms of higher capacity, enhanced rate capability and improved cycling stability when applied as binders and additive-free anode materials for lithium-ion batteries. The superior Li storage performance of the ZCO/NiO NWs could be attributed to the synergetic effect between the ZnCo2O4 core and the NiO shell, as well as its unique hierarchical architecture, which ensures a large specific surface area and good conductivity. Our results may offer very useful guidelines in scrupulously designing 3D core/shell nanowire-array electrodes using cheap, earth-abundant materials in energy storage applications.
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