RT Journal Article A1 Zixiang ZHENG,Wei WU,Tao YANG,Enhui WANG,Zhentao DU,Xinmei HOU,Tongxiang LIANG,Hailong WANG; AD Beijing Advanced Innovation Center for Materials Genome Engineering, Collaborative Innovation Center of Steel Technology, 中国 ; Beijing Advanced Innovation Center for Materials Genome Engineering, Collaborative Innovation Center of Steel Technology, 中国 ; Beijing Advanced Innovation Center for Materials Genome Engineering, Collaborative Innovation Center of Steel Technology, 中国 ; Beijing Advanced Innovation Center for Materials Genome Engineering, Collaborative Innovation Center of Steel Technology, 中国 ; MOE Key Laboratory of New Processing Technology for Non-ferrous Metals and Materials, Guangxi Key Laboratory of Processing for Non-ferrous Metals and Featured Materials, 中国 ; Beijing Advanced Innovation Center for Materials Genome Engineering, Collaborative Innovation Center of Steel Technology, 中国 T1 In situ reduced MXene/AuNPs composite toward enhanced charging/discharging and specific capacitance YR 2021 IS 5 vo 10 OP 1061-OP 1071 K1 composite;self-reduction;MXene;supercapacitors;gold nanoparticles (AuNPs) AB In this work, gold nanoparticles (AuNPs) decorated Ti3C2Tx nanosheets (MXene/AuNPs composite) are fabricated through a self-reduction reaction of Ti3C2Tx nanosheets with HAuCl4 aqueous solution. The obtained composite is characterized as AuNPs with the diameter of about 23 nm uniformly dispersing on Ti3C2Tx 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 Ti3C2Tx and 95% of cyclic stability after 10,000 cycles. Furthermore, MXene/AuNPs composite symmetric supercapacitor with filter paper as separator and H2SO4 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. SN 2226-4108 LA EN