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In this paper, a flexible self-supported electrode based on the porous composite of NiS 2  and Ti 3 C 2 T x  grown on carbon cloth (NiS 2 /Ti 3 C 2 T x -CC) was designed and synthesized. Due to the introduction of highly conductive and flexible Ti 3 C 2 T x , the NiS 2 /Ti 3 C 2 T x -CC electrode achieves a 1.4-fold increase (1214 C g -1  at 2 A g -1 ) in the specific capacity, a 1.3-fold increase in the rate capability (63% of capacity retention with the current density increases from 2 to 20 A g -1 ), and a 2.0-fold increase in the cyclic stability (∼83% of capacity retention at the current density of 20 A g -1  after 2000 charge–discharge cycles) compared with the NiS 2 -CC electrode. Meanwhile, there is no obvious capacity attenuation at the bending angle of 180°, indicating the prominent flexibility of the NiS 2 /Ti 3 C 2 T x -CC electrode. Accordingly, an all-solid asymmetric supercapacitor (ASC) is fabricated, which exhibits a high energy density of 57.55 Wh kg -1  at the power density of 800 W kg -1 . Furthermore, ∼97% of initial capacity is maintained at the current density of 5 A g -1  after 1000 charge–discharge cycles, indicating the good cycling stability. These satisfactory electrochemical behaviors can be also ascribed to the introduction of Ti 3 C 2 T x , which can facilitate the rapid electron transport at the interface of the composite and maintain the outstanding mechanical integrality of the electrode during charge–discharge processes.

3D Self-Supported NiS 2 /Ti 3 C 2 Tx-CC Composite Electrode for High-Performance Flexible Supercapacitors