Vertical-Aligned and Ordered-Active Architecture of Heterostructured Fibers for High Electrochemical Capacitance

IF 17.2 1区工程技术 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY Advanced Fiber Materials Pub Date : 2024-01-05 DOI:10.1007/s42765-023-00349-6

Xiaolin Zhu, Hui Qiu, Yang Zhang, Zengming Man, Wangyang Lu, Ningzhong Bao, Guan Wu

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Abstract

Architecture of fibrous building blocks with ordered structure and high electroactivity that enables quick charge kinetic transport/intercalation is necessary for high-energy-density electrochemical supercapacitors. Herein, we report a heterostructured molybdenum disulfide@vertically aligned graphene fiber (MoS₂@VA-GF), wherein well-defined MoS₂ nanosheets are decorated on vertical graphene fibers by C–O–Mo covalent bonds. Benefiting from uniform microfluidic self-assembly and confined reactions, it is realized that the unique characteristics of a vertical-aligned skeleton, large faradic activity, in situ interfacial connectivity and high-exposed surface/porosity remarkably create efficiently directional ionic pathways, interfacial electron mobility and pseudocapacitive accessibility for accelerating charge transport and intercalation/de-intercalation. Resultant MoS₂@VA-GF exhibits large gravimetric capacitance (564 F g⁻¹) and reversible redox transitions in 1 M H₂SO₄ electrolyte. Furthermore, the MoS₂@VA-GF-based solid-state supercapacitors deliver high energy density (45.57 Wh kg⁻¹), good cycling stability (20,000 cycles) and deformable/temperature-tolerant capability. Beyond that, supercapacitors can realize actual applications of powering multicolored optical fiber lamps, wearable watch, electric fans and sunflower toys.

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用于高电化学电容的垂直排列有序活性异质结构光纤架构

摘要高能量密度电化学超级电容器需要具有有序结构和高电学活性的纤维构件，以实现快速的电荷动力学传输/插值。在本文中，我们报告了一种异质结构二硫化钼@垂直排列石墨烯纤维（MoS2@VA-GF），其中定义明确的 MoS2 纳米片通过 C-O-Mo 共价键装饰在垂直石墨烯纤维上。得益于均匀的微流体自组装和密闭反应，垂直排列的骨架、较大的法拉第活性、原位界面连通性和高暴露表面/孔隙率等独特特性显著地创造了高效的定向离子通道、界面电子迁移率和伪电容可达性，从而加速了电荷传输和插层/去插层。由此产生的 MoS2@VA-GF 在 1 M H2SO4 电解质中显示出较大的重力电容（564 F g-1）和可逆氧化还原转变。此外，基于 MoS2@VA-GF 的固态超级电容器还具有高能量密度（45.57 Wh kg-1）、良好的循环稳定性（20,000 次循环）和可变形/耐温能力。此外，超级电容器还可实现为多色光纤灯、可穿戴手表、电风扇和向日葵玩具供电等实际应用。图表摘要

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来源期刊

Advanced Fiber Materials Multiple-

CiteScore

18.70

自引率

11.20%

发文量

109

期刊介绍： Advanced Fiber Materials is a hybrid, peer-reviewed, international and interdisciplinary research journal which aims to publish the most important papers in fibers and fiber-related devices as well as their applications.Indexed by SCIE, EI, Scopus et al. Publishing on fiber or fiber-related materials, technology, engineering and application.