1. MXene-Derived Defect-Rich TiO2@rGO as High-Rate Anodes for Full Na Ion Batteries and Capacitors.
- Author
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Fang, Yongzheng, Zhang, Yingying, Miao, Chenxu, Zhu, Kai, Chen, Yong, Du, Fei, Yin, Jinling, Ye, Ke, Cheng, Kui, Yan, Jun, Wang, Guiling, and Cao, Dianxue
- Abstract
Highlights: A freestanding MXene-derived defect-rich TiO
2 @reduced graphene oxides (M-TiO2 @rGO) foam electrode was fabricated. M-TiO2 @rGO presents fast Na+ storage kinetics due to capacitive contribution. M-TiO2 @rGO foam electrode displays a capacity retention of 90.7% after 5000 cycles.Sodium ion batteries and capacitors have demonstrated their potential applications for next-generation low-cost energy storage devices. These devices's rate ability is determined by the fast sodium ion storage behavior in electrode materials. Herein, a defective TiO2 @reduced graphene oxide (M-TiO2 @rGO) self-supporting foam electrode is constructed via a facile MXene decomposition and graphene oxide self-assembling process. The employment of the MXene parent phase exhibits distinctive advantages, enabling defect engineering, nanoengineering, and fluorine-doped metal oxides. As a result, the M-TiO2 @rGO electrode shows a pseudocapacitance-dominated hybrid sodium storage mechanism. The pseudocapacitance-dominated process leads to high capacity, remarkable rate ability, and superior cycling performance. Significantly, an M-TiO2 @rGO//Na3 V2 (PO4 )3 sodium full cell and an M-TiO2 @rGO//HPAC sodium ion capacitor are fabricated to demonstrate the promising application of M-TiO2 @rGO. The sodium ion battery presents a capacity of 177.1 mAh g−1 at 500 mA g−1 and capacity retention of 74% after 200 cycles. The sodium ion capacitor delivers a maximum energy density of 101.2 Wh kg−1 and a maximum power density of 10,103.7 W kg−1 . At 1.0 A g−1 , it displays an energy retention of 84.7% after 10,000 cycles. [ABSTRACT FROM AUTHOR]- Published
- 2020
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