In situ polymerization of pyrrole on CNT/cotton multifunctional composite yarn for supercapacitors

Yarn-shaped supercapacitors are favored due to their small size, high specific capacitance, and light weight. Herein, we reported a distinctive type of ply twist yarn supercapacitor by in situ polymerization of pyrrole on carbon nanotubes (CNTs)/cotton ring spun yarns. CNTs and polypyrrole (PPy) were successfully embedded into the cotton yarns with a ply twist structure. The as-developed electrode exhibited excellent electrical conductivity (20 omega/cm), good mechanical properties (59.8 MPa, 24.6%), a high specific capacitance of 386.5 mF/cm(2)with the current density of 1 mA/cm(2), and ideal cycle stability with the retention of 87.8% after 5000 cycles. Meanwhile, the assembled supercapacitor showed a power density of 278.4 mu W/cm(2)and an energy density of 13.21 mu Wh/cm(2). It also presented outstanding capacitive performance under different angles. This facile ply twist method provided new possibilities for one-dimensional (1D) supercapacitor and flexible wearable electronics applications.

Automated summary

Yarn-shaped supercapacitors with CNTs and PPy embedded in cotton yarns with a ply twist structure exhibit excellent electrical conductivity, mechanical properties, high specific capacitance, and ideal cycle stability. The assembled supercapacitor shows good power density and energy density, presenting outstanding capacitive performance under different angles, providing new possibilities for 1D supercapacitors and flexible wearable electronics applications.