超级电容器
材料科学
电极
碳纳米纤维
电容
纳米纤维
储能
功率密度
纳米技术
光电子学
碳纳米管
功率(物理)
化学
量子力学
物理
物理化学
作者
Tolendra Kshetri,Debarani Devi Khumujam,Thangjam Ibomcha Singh,Young Sun Lee,Nam Hoon Kim,Joong Hee Lee
标识
DOI:10.1016/j.cej.2022.135338
摘要
Freestanding and flexible electrodes are crucial for advancing flexible and wearable energy storage devices (FW-ESD). However, the significant trade-off between mechanical flexibility and electrochemical performance of electrodes limits the development of high-performance FW-ESD. Therefore, flexible and freestanding multi-component hybrid electrodes with improved electrochemical properties are in high demand. This work reports a rational design of cobalt-metal organic framework (Co-MOF) structures on a highly flexible and electroconductive MXene-carbon nanofiber mat (MX-CNF). Further, the [email protected] was used as a starting material to derive capacitive-type [email protected] and battery-type MnO2@Co3O4[email protected] functional multi-component electrodes for a high-performance flexible wearable hybrid supercapacitor (FW-HSC). Owing to their high specific surface area (SSA), wettability, conductivity, and abundant active sites, [email protected] and MnO2@Co3O4[email protected] exhibited a specific capacitance of 426.7 F g−1 and a specific capacity of 475.4 mAh g−1 at 1 A g−1, respectively, with excellent mechanical flexibility. Moreover, the two electrodes were used to fabricate an FW-HSC with an operating voltage window of 1.5 V, delivering an energy density of 72.5 Wh kg−1 at a power density of 832.4 W kg−1 with long-term stability (90.36 % capacitance retention). Furthermore, a series connection of two identical FW-HSC devices could power a digital clock and light up a green LED, demonstrating its potential as a power source for various wearable devices.
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