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Issue 48, 2018
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An excellent full sodium-ion capacitor derived from a single Ti-based metal–organic framework

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Abstract

Hybrid ion capacitors, especially sodium ion capacitors (SICs), have recently attracted enormous attention due to their combined merits of high energy density from the battery-type anode and high power density from the capacitor-type cathode. However, achieving high-performance SICs to overcome the sluggish kinetic energy storage feature and inferior cycling stability of the battery-type anode remains a challenge. In this work, N-doped porous carbon embedded with ultrasmall titanium oxynitride nanoparticles (TiOxNy/C) was developed from metal–organic frameworks (MOFs). As the SIC anode, the as-designed TiOxNy/C exhibited a high reversible capacity (275 mA h g−1 at 50 mA g−1), ultrahigh rate capability, and superior cycling performance, which is attributed to the effective synergy between the ultrasmall TiOxNy nanoparticles and N-doped porous carbon. Furthermore, using a “two-for-one” strategy, N-doped hierarchical porous carbon (NHPC) with high surface area was prepared from TiOxNy/C by HF etching and displayed high specific capacity and rate capability when used as a SIC cathode. Considering the excellent electrochemical performances of both the anode and cathode, the as-assembled TiOxNy/C//NHPC SIC delivered a high energy density (80 W h kg−1) and high power density (4000 W kg−1).

Graphical abstract: An excellent full sodium-ion capacitor derived from a single Ti-based metal–organic framework

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Publication details

The article was received on 18 Sep 2018, accepted on 15 Nov 2018 and first published on 24 Nov 2018


Article type: Paper
DOI: 10.1039/C8TA09072F
Citation: J. Mater. Chem. A, 2018,6, 24860-24868
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    An excellent full sodium-ion capacitor derived from a single Ti-based metal–organic framework

    H. Chen, C. Dai, Y. Li, R. Zhan, M. Wang, B. Guo, Y. Zhang, H. Liu, M. Xu and S. Bao, J. Mater. Chem. A, 2018, 6, 24860
    DOI: 10.1039/C8TA09072F

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