Graphene-coupled Ti3C2 MXenes-derived TiO2 mesostructure: promising sodium-ion capacitor anode with fast ion storage and long-term cycling†,Journal of Materials Chemistry A

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Graphene-coupled Ti3C2 MXenes-derived TiO2 mesostructure: promising sodium-ion capacitor anode with fast ion storage and long-term cycling†
Journal of Materials Chemistry A ( IF 10.7 ) Pub Date : 2017-12-12 00:00:00 , DOI: 10.1039/c7ta09153b
Rutao Wang _{1,

2,

3,

4} , Shijie Wang _{1,

2,

3,

4} , Yabin Zhang _{1,

2,

3,

4} , Dongdong Jin _{1,

2,

3,

4} , Xinyong Tao _{4,

5,

6,

7} , Li Zhang _{1,

2,

3,

4}

Affiliation

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.

中文翻译：

石墨烯耦合的Ti ₃ c ^ _2个MXenes衍生的TiO ₂细微结构：具有快速离子存储和长期循环有为钠离子电容器阳极†

钠离子电容器和电池由于地球上钠的含量高而被认为是替代锂离子电容器的低成本能源存储技术。然而，由于缺乏高性能的电极材料，它们的广泛使用受到了限制。在这项工作中，我们报告说，只需将H ₂ O ₂从浓缩到稀释，即可在室温下将MXenes-Ti ₃ C ₂氧化为Ti-peroxo络合物凝胶。该凝胶的高度水溶性的属性允许的石墨烯支持TiO 2的合成₂的纳米复合材料具有高度多孔纳米/内消旋混合架构经由一种更简便，更环保的方式。所生产的TiO ₂ -RGO纳米复合材料的独特混合体系结构可在Na ⁺电荷存储中实现拟电容行为，具有高可逆性，快速动力学，长循环性以及对母体结构的可忽略的降解。通过将TiO ₂ -RGO复合材料作为阳极，可以构建一种新型钠离子电容器，该电容器能够在4.0 V的高压下工作，并提供94.7 W h kg ^-1的最大能量密度。，可与基于锂离子的电容器相媲美。特别是考虑到MXenes产品组合的扩大，这里报道的方法可能会扩展到制造许多应用的MXenes衍生的金属氧化物纳米材料或纳米复合材料。

更新日期：2017-12-12

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