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Core/shell Ni-P@Ni-Co composite with micro-/nanostructure for supercapacitor.(Energy Materials)

Li, Dandan ; Li, Yu ; Xu, Zongying ; Wang, Dawei ; Wang, Tianpeng ; Zhao, Jing ; Zhang, Huaihao

Journal of Materials Science, 2018, Vol.53(5), p.3647(14) [Tạp chí có phản biện]

ISSN: 0022-2461 ; DOI: 10.1007/s10853-017-1776-0

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  • Nhan đề:
    Core/shell Ni-P@Ni-Co composite with micro-/nanostructure for supercapacitor.(Energy Materials)
  • Tác giả: Li, Dandan ; Li, Yu ; Xu, Zongying ; Wang, Dawei ; Wang, Tianpeng ; Zhao, Jing ; Zhang, Huaihao
  • Chủ đề: Cobalt ; Capacitors
  • Là 1 phần của: Journal of Materials Science, 2018, Vol.53(5), p.3647(14)
  • Mô tả: In this paper, the core/shell Ni-P@Ni-Co composite with micro-/nanostructure, coating Ni-Co on the precursor Ni-P microspheres, has been synthesized successfully via facile two-step hydrothermal method. The chemical composition and microstructure of as-prepared samples were characterized by XRD, EDS, BET, XPS, SEM, and TEM. The results show that the core/shell composite Ni-P@Ni-Co, with a more rough surface and larger specific surface area (74.2 m.sup.2 g.sup.-1) than bare Ni-P, exhibits good charge storage performance (the specific capacitance reaches up to 1221.1 F g.sup.-1 at the current density of 1 A g.sup.-1, 1.8 times of Ni-P under the same conditions), and good cycling performance (the retention of specific capacitance is 95.8% after 5000 cycles at 2 A g.sup.-1 current density). To further evaluate the practical application property of Ni-P@Ni-Co, an asymmetric supercapacitor (Ni-P@Ni-Co//AC) was assembled, with the Ni-P@Ni-Co and activated carbon (AC) as the positive and negative electrodes, respectively. The electrochemical results reveal that Ni-P@Ni-Co//AC delivers a high energy density of 28.9 Wh kg.sup.-1 at a power density of 0.4 kW kg.sup.-1, along with a specific capacitance retention rate of 89.1% and nearly 100% Coulomb efficiency at a current density of 1 A g.sup.-1 after 5000 cycles.
  • Ngôn ngữ: English
  • Số nhận dạng: ISSN: 0022-2461 ; DOI: 10.1007/s10853-017-1776-0

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