Worm-like amorphous MnO2 nanowires 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.