Hierarchically structured VO2@PPy core-shell nanowire arrays grown on carbon nanotube fibers as advanced cathodes for high-performance wearable asymmetric supercapacitors

Fiber-shaped asymmetric supercapacitors (FASCs) have emerged as intriguing energy storage devices for next-generation wearable electronics. However, the limited specific capacitances that arise from electrode materials severely restrict further enhancement of their energy densities. We successfully fabricated a hierarchically structured three-dimensional VO2@polypyrrole (VO2@PPy) core-shell nanowire array (NWA) on carbon nanotube fiber (CNTF)...