4.7 Article

Self-supported 3D NiCo-LDH/Gr composite nanosheets array electrode for high-performance supercapacitor

Journal

JOURNAL OF ALLOYS AND COMPOUNDS
Volume 763, Issue -, Pages 926-934

Publisher

ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2018.05.358

Keywords

Graphene; Nickel cobalt layered double hydroxide; Asymmetric supercapacitors; Self-supported; Nanosheets array

Funding

  1. National High-Technology Research and Development Program of China 863 Plan [2015AA034801]
  2. SKLMT-ZZKT [2017M15, 2015Z16]
  3. NSFC [11544010, 11374359, 11304405, 1155305]
  4. Natural Science Foundation of Chongqing [cstc2015jcyjA50035, cstc2015jcyjA1660]
  5. Fundamental Research Funds for the Central Universities [106112017CDJQJ328839, 106112016CDJZR288805, 106112015CDJXY 300002]
  6. Sharing Fund of Large-scale Equipment of Chongqing University [201712150005, 201712150006, 201712150010]

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Graphene film (GF) and graphene nanowall (GW) are first grown on conductive nickel foams (NF) by a chemical vapor deposition (CVD) method. Then the nickel cobalt layered double hydroxides (NiCo-LDHs) nanosheets arrays are directly deposited on the NF, GF/NF and GW/NF by a facile hydrothermal method to form three-dimensional (3D) porous NiCo-LDH/Gr composite electrodes. The electrochemical performance and morphology of the obtained self-supported NiCo-LDH/NF, NiCo-LDH/GF/NF and NiCo-LDH/ GW/NF composite electrodes are analyzed and observed. It shows that the NiCo-LDH/GF/NF composite electrode exhibits excellent capacitive properties (2690 F g(-1) at 5 A g(-1)), which is 2.0 and 1.5 times of that of NiCo-LDH/NF and NiCo-LDH/GW/NF. The outstanding capacity of the NiCo-LDH/GF/NF electrode is ascribed to the numerous channels for rapid electron transport provided by the self-supported and high-quality GF. In addition, an asymmetric supercapacitor (ASC) is fabricated by using NiCo-LDH/GF/NF electrode. The optimized NiCo-LDH/GF/NF//AC device delivers a maximum energy density of 50.2 Wh kg(-1), a high power density of 8002Wkg(-1) at 17.6Wh kg(-1), and powers two green light-emitting-diodes for more than 3min after charging 1 min. Therefore, the NiCo-LDH/Gr/NF composite electrode is a potential candidate in electrochemical energy storage device. (C) 2018 Elsevier B.V. All rights reserved.

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