MXene-Derived Defect-Rich TiO2@rGO as High-Rate Anodes for Full Na Ion Batteries and Capacitors

• Main Authors: Yongzheng Fang, Yingying Zhang, Chenxu Miao, Kai Zhu, Yong Chen, Fei Du, Jinling Yin, Ke Ye, Kui Cheng, Jun Yan, Guiling Wang, Dianxue Cao
• Format: Article
• Language: English
• Published: SpringerOpen 2020-06-01
• Series: Nano-Micro Letters
• Subjects: MXene–Ti2CT x; Vacancy oxygen; Self-supporting; TiO2 anodes; Sodium ion battery and capacitor
• Online Access: http://link.springer.com/article/10.1007/s40820-020-00471-9

Abstract 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//Na3V2(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.