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Synthesis and characterization of two-faced brush-like MXene anchored NiCo-LDH electrode for high-performance supercapacitors

Author

Listed:
  • Sun, Miao
  • Wang, Yanan
  • Sunarso, Jaka
  • Meng, Xiuxia
  • Zhang, Weimin
  • Cao, Jun
  • Yang, Naitao

Abstract

Layered nickel‑cobalt double hydroxide (NiCo-LDH) with a high theoretical charge storage capacity has great potential to be used as a supercapacitor (SC) electrode. However, its low electronic conductivity, low stability, and aggregation tendency has been recognized as the main drawbacks. Herein, solvent-induced interfacial-confined process was used to synthesize an unusual brush-like heterostructure of NiCo-LDH vertically anchored on conductive MXene nanosheets, enabled by the solvent-induced effect of the polar hydroxyl group of ethylene glycol and the limited domain effect of MXene nanosheets. This unique brush-like structure promoted mass transfer and improves charge transport behaviours compared to the pure NiCo-LDHs. The resultant NiCo-LDH@MXene had an ideal larger peak pore size of 3.8 nm and BET specific surface area of 175.13 m2 g−1 compared to those of NiCo-LDH, which facilitates the exposure of active sites and mass transfer. In three-electrode configuration, NiCo-LDH@MXene provided a significant specific capacity of 1310 F g−1 at a 1 A g−1 current density. At a power density of 699.1 W kg−1, NiCo-LDH@MXene showcased a substantial energy density of 73.8 Wh kg−1 in a symmetric supercapacitor. At a 6 A g−1 current density, NiCo-LDH@MXene-based SC could retain 92.5% of its capacitance at the end of 10,000 charge and discharge cycles, underscoring its excellent stability in practical application. Electrochemical tests and DFT simulation further revealed enhanced ionic adsorption/transport and electron transport, more enriched active sites, and altered electrical configuration on account of the lower energy barrier for NiCo-LDH@MXene relative to NiCo-LDH. The synthesis route and the insights reported here pave a way toward advanced electrode design and development.

Suggested Citation

  • Sun, Miao & Wang, Yanan & Sunarso, Jaka & Meng, Xiuxia & Zhang, Weimin & Cao, Jun & Yang, Naitao, 2024. "Synthesis and characterization of two-faced brush-like MXene anchored NiCo-LDH electrode for high-performance supercapacitors," Applied Energy, Elsevier, vol. 361(C).
  • Handle: RePEc:eee:appene:v:361:y:2024:i:c:s0306261924003271
    DOI: 10.1016/j.apenergy.2024.122944
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    References listed on IDEAS

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    1. Rongming Xu & Yuan Kang & Weiming Zhang & Bingcai Pan & Xiwang Zhang, 2023. "Two-dimensional MXene membranes with biomimetic sub-nanochannels for enhanced cation sieving," Nature Communications, Nature, vol. 14(1), pages 1-10, December.
    2. Wei Guo & Chaochao Dun & Chang Yu & Xuedan Song & Feipeng Yang & Wenzheng Kuang & Yuanyang Xie & Shaofeng Li & Zhao Wang & Jinhe Yu & Guosheng Fu & Jinghua Guo & Matthew A. Marcus & Jeffrey J. Urban &, 2022. "Mismatching integration-enabled strains and defects engineering in LDH microstructure for high-rate and long-life charge storage," Nature Communications, Nature, vol. 13(1), pages 1-10, December.
    3. Shaohua Liu & Pavlo Gordiichuk & Zhong-Shuai Wu & Zhaoyang Liu & Wei Wei & Manfred Wagner & Nasser Mohamed-Noriega & Dongqing Wu & Yiyong Mai & Andreas Herrmann & Klaus Müllen & Xinliang Feng, 2015. "Patterning two-dimensional free-standing surfaces with mesoporous conducting polymers," Nature Communications, Nature, vol. 6(1), pages 1-9, December.
    4. Ren, Danhong & Li, Xuan & Zhao, Xinhao & Liu, Baocheng & Yang, Zhengchun & He, Jie & Li, Tong & Pan, Peng, 2022. "Development and evaluation of Zn2+ ions hybrid supercapacitor based on ZnxMnO2-CNTs cathode," Applied Energy, Elsevier, vol. 324(C).
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