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Graphene-coupled Ti3C2 MXenes-derived TiO2 mesostructure: promising sodium-ion capacitor anode with fast ion storage and long-term cycling

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Abstract

Sodium-ion-based capacitors and batteries are considered as a low-cost energy storage technology alternative to their lithium-ion counterparts owing to the abundance of sodium in Earth. Their widespread use is however limited by the lack of high-performance electrode materials. In this work, we report that MXenes-Ti3C2 can be oxidized into a Ti-peroxo complex gel at room temperature by simply adding H2O2, from concentrated to dilute. The highly water-soluble property of this gel allows the synthesis of a graphene-supported TiO2 nanocomposite with highly porous nano-/meso-hybrid architecture via a more facile and environmentally friendly way. The unique hybrid architecture of the produced TiO2–RGO nanocomposite results in pseudocapacitive behavior in Na+ charge storage with high reversibility, fast kinetics, long cyclability, and negligible degradation to the parent structure. By incorporating the TiO2–RGO composite as the anode, a novel sodium-ion capacitor is constructed that is capable of operating at a high voltage of 4.0 V and delivering a maximum energy density of 94.7 W h kg−1, which is comparable to lithium-ion based capacitors. The approach reported here could be potentially extended for fabricating a host of MXenes-derived metal oxide nanomaterials or nanocomposites for numerous applications, particularly in view of the expanding MXenes portfolio.

Graphical abstract: Graphene-coupled Ti3C2 MXenes-derived TiO2 mesostructure: promising sodium-ion capacitor anode with fast ion storage and long-term cycling

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Publication details

The article was received on 18 Oct 2017, accepted on 10 Dec 2017 and first published on 12 Dec 2017


Article type: Paper
DOI: 10.1039/C7TA09153B
Citation: J. Mater. Chem. A, 2018, Advance Article
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    Graphene-coupled Ti3C2 MXenes-derived TiO2 mesostructure: promising sodium-ion capacitor anode with fast ion storage and long-term cycling

    R. Wang, S. Wang, Y. Zhang, D. Jin, X. Tao and L. Zhang, J. Mater. Chem. A, 2018, Advance Article , DOI: 10.1039/C7TA09153B

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