Graphene-coupled Ti3C2 MXenes-derived TiO2 mesostructure: promising sodium-ion capacitor anode with fast ion storage and long-term cycling. Issue 3 (20th December 2017)

• Record Type: Journal Article
• Authors: Wang, Rutao; Wang, Shijie; Zhang, Yabin; Jin, Dongdong; Tao, Xinyong; Zhang, Li
• Is Part Of: Journal of materials chemistry. Volume 6:Issue 3(2018)
• Page Start: 1017
• Page End: 1027
• Publication Date: 2017-12-20
• Subjects: Materials -- Research -- Periodicals; Chemistry, Analytic -- Periodicals; Environmental sciences -- Research -- Periodicals; 543.0284
• DOI: 10.1039/c7ta09153b
• Languages: English
• ISSNs: 2050-7488

Abstract

Abstract : Graphene coupled Ti3 C2 MXenes-derived TiO2 mesostructure with robust Na-ion charge storage properties enables the fabrication of high-performance Na-ion capacitors. 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-Ti3 C2 can be oxidized into a Ti-peroxo complex gel at room temperature by simply adding H2 O2, 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.