Journal
JOURNAL OF MATERIALS CHEMISTRY A
Volume 4, Issue 24, Pages 9670-9676Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c6ta02339h
Keywords
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Funding
- NSFC [51471089]
- MOE [IRT-13R30]
- 111 Project [B12015]
- Research Fund for the Doctroral Program of Higher Education of China [20120031110001]
- Tianjin Sci Tech Project [10SYSYJC27600]
- China's Post-doctoral Science Fund [2015M581304]
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An advanced asymmetric supercapacitor device (ASC) with high energy density was successfully fabricated by using a three-dimensional (3D) core-shell Ni@C hybrid as the positive electrode and activated carbon (AC) as the negative electrode. In addition, the Ni@C hybrid exhibited a one-dimensional (1D) morphology as a whole and a 3D core-shell nanostructure in details. The Ni@C hybrid was subtly controlled down to 10 nm scale to achieve a large exposed exterior surface and a remitting diffusion-controlled ion transference process. Moreover, the 1D porous texture and Ni-decoration of the Ni@C hybrids improved the supercapacitive performance enormously, with an ultrathin carbon shell ensuring a large external active surface and high electrical conductivity. Due to its unique core-shell structure, the Ni@C hybrid electrode delivered a high 2006 F g(-1) capacitance at 1 A g(-1), and still retained a high 1582 F g(-1) capacitance with the current density increasing up to 20 A g(-1). Coupled with the AC negative electrode, the ASC device delivered a 152.7 F g(-1) capacitance at 1 A g(-1) and 99 F g(-1) at 10 A g(-1). The capacitance retention reached up to 91% after 2000 cycles at a 1 A g(-1) current density. In addition, the ASC device delivered a maximum 61.3 W h kg(-1) energy density with a 1.6 V operational voltage, which could remain at 39.8 W h kg(-1) even at a 1.12 kW kg(-1) power density, suggesting promising future applications.
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