3D Printing of Porous Nitrogen-Doped Ti 3 C 2 MXene Scaffolds for High-Performance Sodium-Ion Hybrid Capacitors

• Published in: ACS nano 2020-01, Vol.14 (1), p.867-876
• Main Authors: Fan, Zhaodi, Wei, Chaohui, Yu, Lianghao, Xia, Zhou, Cai, Jingsheng, Tian, Zhengnan, Zou, Guifu, Dou, Shi Xue, Sun, Jingyu
• Format: Article
• Language: English
• ISSN: 1936-0851; 1936-086X
• DOI: 10.1021/acsnano.9b08030

3D printing technology has stimulated a burgeoning interest to fabricate customized architectures in a facile and scalable manner targeting wide ranged energy storage applications. Nevertheless, 3D-printed hybrid capacitor devices synergizing favorable energy/power density have not yet been explored thus far. Herein, we demonstrate a 3D-printed sodium-ion hybrid capacitor (SIC) based on nitrogen-doped MXene ( -Ti C T ) anode and activated carbon cathode. N-Ti C T affording a well-defined porous structure and uniform nitrogen doping can be obtained via a sacrificial template method. Thus-formulated ink can be directly printed to form electrode architecture without the request of a conventional current collector. The 3D-printed SICs, with a large areal mass loading up to 15.2 mg cm , can harvest an areal energy/power density of 1.18 mWh cm /40.15 mW cm , outperforming the state-of-the-art 3D-printed energy storage devices. Furthermore, our SIC also achieves a gravimetric energy/power density of 101.6 Wh kg /3269 W kg . This work demonstrates that the 3D printing technology is versatile enough to construct emerging energy storage systems reconciling high energy and power density.