In situ reduced MXene/AuNPs composite toward enhanced charging/discharging and specific capacitance

• Published in: Journal of advanced ceramics Vol. 10; no. 5; pp. 1061 - 1071
• Main Authors: Zheng, Zixiang, Wu, Wei, Yang, Tao, Wang, Enhui, Du, Zhentao, Hou, Xinmei, Liang, Tongxiang, Wang, Hailong
• Format: Journal Article
• Language: English
• Published: Beijing Tsinghua University Press 01.10.2021; Springer Nature B.V
• Subjects: Aqueous solutions; Capacitance; Carbon; Cellulose; Ceramics; Characterization and Evaluation of Materials; Charging; Chemical reduction; Chemistry and Materials Science; Composite materials; Composites; Discharge; Electrodes; Electrolytes; Energy storage; Flux density; Glass; Gold; Laboratories; Materials Science; Membrane filters; Metals; MXenes; Nanoparticles; Nanostructure; Nanotechnology; Natural Materials; Research Article; Separators; Structural Materials; Sulfuric acid; Supercapacitors; gold nanoparticles (AuNPs); supercapacitors; composite; self-reduction; MXene
• ISSN: 2226-4108; 2227-8508
• DOI: 10.1007/s40145-021-0491-0

In this work, gold nanoparticles (AuNPs) decorated Ti 3 C 2 T x nanosheets (MXene/AuNPs composite) are fabricated through a self-reduction reaction of Ti 3 C 2 T x nanosheets with HAuCl 4 aqueous solution. The obtained composite is characterized as AuNPs with the diameter of about 23 nm uniformly dispersing on Ti 3 C 2 T x nanosheets without aggregation. The composite (MXene decorated on 4.8 wt% AuNPs) is further employed to construct supercapacitor for the first time with a higher specific capacitance of 278 F·g −1 at 5 mV·s −1 than that of pure Ti 3 C 2 T x and 95% of cyclic stability after 10,000 cycles. Furthermore, MXene/AuNPs composite symmetric supercapacitor with filter paper as separator and H 2 SO 4 as electrolyte, is assembled. The supercapacitor exhibits a high volumetric energy density of 8.82 Wh·L −1 at a power density of 264.6 W·L −1 and ultrafast-charging/discharging performance. It exhibits as a promising candidate applied in integrated and flexible supercapacitors.