Abstract

All-solid-state flexible supercapacitors based on a carbon/MnO<sub>2</sub> (C/M) core–shell fiber structure were fabricated with high electrochemical performance such as high rate capability with a scan rate up to 20 V s<sup>–1</sup>, high volume capacitance of 2.5 F cm<sup>–3</sup>, and an energy density of 2.2 × 10<sup>–4</sup> Wh cm<sup>–3</sup>. By integrating with a triboelectric generator, supercapacitors could be charged and power commercial electronic devices, such as a liquid crystal display or a light-emitting-diode, demonstrating feasibility as an efficient storage component and self-powered micro/nanosystems.

Keywords:
Supercapacitor Capacitance Triboelectric effect Power density Energy storage Energy density Volume (thermodynamics) Horizontal scan rate

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