Bacterial cellulose modified polyaniline/Ti3C2Tx MXene fiber to enhance robust and electrochemical activity for wire-shaped supercapacitors

Developing miniaturization, adaptability and weavability wire-shaped supercapacitor (F-SC) with admirable electrochemical performance and exceptional mechanical properties, has been a pivotal issue for wearable system. Here, we fabricated flexible F-SCs assembled by heterogeneous polyaniline (PANI)/bacterial cellulose (BC)/Ti 3 C 2 T x (PBT) hybrid fiber. BC nanofibers , as both reinforcement and spacer, can link with the adjacent Ti 3 C 2 T x flakes together to enhance the mechanical properties and prevent the restacking of Ti 3 C 2 T x flakes to accelerate the ion diffusion. And the PANI nanoparticle plays a crucial role in providing more active sites to improve the electrochemical performance. Besides, the continuous Ti 3 C 2 T x sheet arrangement in hybrid fiber guarantees favorable conductivity and forms a smooth pathway for electron migration. Thus, the PBT fiber shows high mechanical property (123.42 MPa), mass capacitance of 337 F g −1 in 1 A g −1 , superior rate performance (129 F g −1 at 10 A g −1 ) and exceptional cycling stability (84.1 % capacitance retention after 10,000 cycling). Moreover, the solid-state symmetric F-SC displays capacitance of 259 F g −1 , 86 % capacitance retention after 10,000 cycles, maximum energy density of 7.28 Wh kg −1 and favorable mechanical endurance, which displays a promising future in smart wearable system.