An ultra-high endurance and high-performance quasi-solid-state fiber-shaped Zn–Ag2O battery to harvest wind energy

Abstract

With the development of wearable electronics, sustainable energy-charged fiber-shaped aqueous rechargeable batteries have become attractive power sources. Environmentally benign zinc-silver oxide (Zn–Ag₂O) batteries with high energy density and ultra-stable output voltage have been demonstrated to be promising energy-storage devices. However, the major bottleneck for extensive application of Zn–Ag₂O batteries is poor cyclic performance and low energy density due to structural pulverization, migration of Ag ions, and low loading of active substances. Herein, a quasi-solid-state fiber-shaped Zn–Ag₂O battery was constructed employing Ag₂O on a metal–organic framework (MOF)-derived N-doped carbon nanosheet array (NC) with a poly(3,4-ethylenedioxythiophene)poly(styrenesulfonate) (PEDOT:PSS) buffer layer as the cathode. A PEDOT:PSS protective layer could suppress structural pulverization and alleviate the migration of Ag ions. An MOF-derived NC skeleton enabled maintenance of structural integrity and increased the mass loading of Ag₂O. This resulted in a quasi-solid-state fiber-shaped Zn–Ag₂O battery delivering a high energy density of 1.57 mW h cm⁻² and remarkable cyclic durability (79.5% after 200 cycles), which are higher than those reported for any state-of-the-art Zn–Ag₂O battery. More importantly, the as-fabricated Zn–Ag₂O battery could be charged solely by wind energy. Thus, the present work provides a new way to harvest clean and renewable wind energy for portable and wearable electronics.