Journal
NANO-MICRO LETTERS
Volume 12, Issue 1, Pages -Publisher
SHANGHAI JIAO TONG UNIV PRESS
DOI: 10.1007/s40820-020-00471-9
Keywords
MXene-Ti2CTx; Vacancy oxygen; Self-supporting; TiO2 anodes; Sodium ion battery and capacitor
Funding
- National Natural Science Foundation of China [51702063, 51672056]
- Natural Science Foundation of Heilongjiang [LC2018004]
- China Postdoctoral Science Foundation [2018M630340, 2019T120254]
- Fundamental Research Funds for the Central University
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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.
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