Worm-like amorphous MnO₂nanowires grown on textiles for high-performance flexible supercapacitors

Abstract

A novel class of amorphous MnO2 nanowires with a worm-like (WL) nanostructure was prepared by electrodeposition and a possible formation mechanism was proposed. The specific capacitance of WL amorphous MnO2 was 2–3 times larger than that of its crystalline cotton-like MnO2 counterpart. The unique WL amorphous nanostructure is believed to significantly facilitate the electrochemical performance of MnO2. Flexible solid-state symmetric supercapacitors assembled with WL-MnO2 electrodes exhibited a high energy density of 6.3 W h kg−1. These results demonstrate that the amorphous WL nanostructure grown on carbon fabric can serve as a promising electrode material for flexible and portable energy storage devices.