Abstract
Benefiting from high flexibility and weavability, the wire-shaped supercapacitors (SCs) arouse tremendous interests for the applications in wearable/portable electronics. Graphene fiber (GF) is considered as a promising linear electrode for wire-shaped SCs. However, the bottleneck is how to develop the GF-based linear electrode with facile fabrication process while well-maintaining satisfactory electrochemical performance. Herein, a novel Fe3O4@GF composite linear electrode is proposed via a chemical reduction-induced assembly approach, in which the GO and Fe3O4 nanoparticles (NPs) realize the efficient self-assembly owing to the electrostatic and van der Waals interactions, as well as the sufficient reduction of GO during the preparation process. The resultant fiber-shaped architecture shows boosted charge-transfer kinetics, high flexibility and structural integrity. Such Fe3O4@GF linear electrode exhibits excellent electrochemical behaviors including a large volumetric specific capacitance (∼250.75 F cm−3), remarkable rate capability and favorable electrochemical kinetics in aqueous electrolyte, superior than previously reported GF-based linear electrodes. For real application, a high-performance wire-shaped SC with excellent flexibility and weavability is fabricated based on such Fe3O4@GF linear electrode and gel electrolyte, demonstrating ultrahigh volumetric energy density (18.8 mWh cm−3), power density (4000 mW cm−3) and strong durability (∼93.5% retention after 10000 cycles). Prospectively, the fabricated wire-shaped SC can maintain reliable electrochemical behaviors in various deformation states, showing its potentials in future portable and wearable devices.
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This work was supported by the National Natural Science Foundation of China (Grant Nos. 61904116, 52002157), the Natural Science Foundation of Jiangsu Province (Grant No. BK20190976), and the Science and Technology Project of State Grid Corporation of China (Grant No. 5455DW190009).
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A facile chemical reduction-induced assembly of Fe3O4@graphene fiber for wire-shaped supercapacitors with ultrahigh volumetric energy density
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Xiao, P., Shi, M., Xu, L. et al. An efficient chemical reduction-induced assembly of Fe3O4@graphene fiber for wire-shaped supercapacitors with ultrahigh volumetric energy density. Sci. China Technol. Sci. 64, 2246–2254 (2021). https://doi.org/10.1007/s11431-020-1896-5
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DOI: https://doi.org/10.1007/s11431-020-1896-5