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Lightweight Flexible Solid-State Supercapacitor Based On Metal–Graphene-Textile Composite Electrodes

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posted on 2023-08-21, 17:09 authored by Ya Song, Yingnan Zhang, Huawei Yang, Lixia Yang, Liangjiu Bai, Donglei Wei, Wenxiang Wang, Ying Liang, Hou Chen
Flexible supercapacitors (FSCs) are regarded as promising energy storage devices for portable electronic products due to their quick charging/discharging capabilities and high security. However, developing high-energy-density FSC devices using cost-effective materials and feasible manufacturing techniques remains a challenge. In this work, we propose a hierarchical metal–graphene-textile current collector to address this issue. The composite collector is made up of metal Ni electrodeposited on the surface of graphene-coated nonwoven fabric, which is further fabricated to flexible anode and cathode by electrodeposition of Co(OH)2 and FeOOH arrays, respectively. Then, a self-standing, all solid-state asymmetric flexible supercapacitor (FSC) is developed using the flexible electrodes with alkaline potassium hydroxide/poly(vinyl alcohol) (KOH/PVA) hydrogel as a gel electrolyte. Notably, the FSC device exhibits an impressive areal capacitance of 205.2 mF cm–2 within a working voltage window of 1.3 V, resulting in an energy density of 48.2 μWh cm–2. Furthermore, the FSC shows outstanding cyclic and mechanical stability, retaining its initial capacitance well under various bending states. Our work presents a promising design approach for the facile and rational construction of lightweight, highly flexible, and cost-effective supercapacitors.

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