Flexible Zinc‐Ion Hybrid Capacitor Based on Interface‐Engineered Textile of Waste Face Masks

Abstract

Flexible energy storage devices based on textiles have attracted great attention due to their enormous potential in wearable electronics. Herein, flexible zinc‐ion hybrid capacitors (ZHCs) are proposed for wearable systems using waste face masks (WFMs) as the substrate and separator. The WFMs are covered with poly(3,4‐ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS) to enhance the surface conductivity. Thereafter, polypyrrole and Zn are grown on the surfaces of WFMs, respectively, by the one‐step electrodeposition method. The flexible ZHC consists of surface‐engineered textiles which can function as the electrode and current collector. The as‐fabricated device possesses excellent specific capacity (105.1 mAh g−1), power density (117.8 W kg−1), and energy density (84.3 Wh kg−1). Besides, it maintains excellent electrochemical performance after 10 000 charge/discharge cycles and 5000 bending cycles. Furthermore, the device is capable of ensuring a stable power supply and driving an electronic meter for nearly a day. This work provides a facile strategy to construct low‐cost textile‐based flexible ZHCs from WFMs.

Compressible zinc‐ion hybrid supercapacitor and piezoresistive sensor based on reduced graphene oxide/polypyrrole modified melamine sponge

“…According to the Ragone plots in Figure 7E and the detailed data in Table 1, the maximum energy density and power density of this CZHS can reach 103.8 Wh kg −1 and 804.2 W kg −1 respectively, which are comparable with other reported zinc‐ion energy storage devices. [ 35–40 ] In addition, this CZHS shows high capacity retention of 72.0% after 15,000 GCD cycles and Coulombic efficiency of ~100% during the cycling test (Figure 7F), indicating its excellent long‐term cycling stability. In general, PPy‐based electrodes have poor cycling stability because the structure of PPy can be destroyed by the repeated insertion/release of ions during the GCD cycling process.…”

“…The electrolyte gradually diffuses into the PPy particles, leading to the activation process of PPy and the increase in capacity retention during the first 500 cycles. [16,35] After 3000 compression/release cycles, the CZHS still maintains 90.9% capacity retention. The high compressive performance is likely owing to three reasons.…”