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Cauliflower-Like Ni/MXene-bridged fiber-shaped electrode for flexible microsupercapacitor

Darmiani, N ; Sharif University of Technology | 2022

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  1. Type of Document: Article
  2. DOI: 10.1021/acs.energyfuels.1c03618
  3. Publisher: American Chemical Society , 2022
  4. Abstract:
  5. Microscale, flexible, and lightweight electrodes are of interest for the generation of light and miniaturized energy storage systems such as microsupercapacitors. Wire or fiber-shaped electrodes can be considered as potential candidates for microsupercapacitor fabrication. Herein, a facile strategy for the preparation of high electrochemical performance fiber-shaped microsupercapacitors based on Ni(OH)2-Ni-Ti3C2 film on a copper wire (CW) electrode is presented. We employed a porous cauliflower-like Ni-Ti3C2 MXene film as the supporting scaffold to bridge a Ni(OH)2 active substance with a Cu wire current collector. This hierarchical structure supplies a high surface area, many electroactive sites, and a short ion diffusion pathway and delivers outstanding performance with superior capacitance (1725.23 Fcm-3 and 19.81 Fcm-2 at 4 mAcm2) and a rather high rate capability (929.23 Fcm-3 and 10.33 Fcm-2 at 20 mAcm-2). It should be noted that the electrochemical behavior of Ni-Ti3C2@CW is significantly better than that of directly growing Ni on Cu wire due to the cauliflower-like morphology and high conductivity of the Ti3C2. Furthermore, a fiber-shaped supercapacitor (FSC) is assembled using Ni(OH)2-Ni-Ti3C2@CW and Ti3C2@CW as the positive and negative electrodes, respectively. The fabricated FSC shows high capacitance (72.35 Fcm-3 and 756 mFcm-2 at 1.5 mAcm-2), good rate capability, a maximum energy density of 206 μWhcm-2 at a power density of 1.94 mW cm-2, long cycling stability (89.3% capacitance retention after 7000 cycles at 50 mVs-1), and good flexibility. Therefore, the introduced wire-shaped electrode through a simple process could be a promising approach for a new class of microsupercapacitors. © 2022 American Chemical Society
  6. Keywords:
  7. Capacitance ; Copper ; Electrochemical electrodes ; Fibers ; Film preparation ; Morphology ; Nickel compounds ; Scaffolds ; Titanium compounds ; Active substance ; Copper wires ; Cu wires ; Current-collector ; Electrochemical performance ; Microsupercapacitors ; Performance Fibers ; Storage systems ; Wire currents ; Wire electrode ; Wire
  8. Source: Energy and Fuels ; Volume 36, Issue 4 , 2022 , Pages 2140-2148 ; 08870624 (ISSN)
  9. URL: https://pubs.acs.org/doi/10.1021/acs.energyfuels.1c03618