Hair-based flexible knittable supercapacitor with wide operating voltage and ultra-high rate capability. (April 2017)

• Record Type: Journal Article
• Authors: Liu, Wenwen; Feng, Kun; Zhang, Yining; Yu, Tongwen; Han, Lei; Lui, Gregory; Li, Matthew; Chiu, Gordon; Fung, Pamela; Yu, Aiping
• Is Part Of: Nano energy. Volume 34(2017:Apr.)
• Page Start: 491
• Page End: 499
• Publication Date: 2017-04
• Subjects: Supercapacitors -- Flexible -- Fiber-shaped -- Operating voltage -- Rate capability; Nanoscience -- Periodicals; Nanotechnology -- Periodicals; Nanostructured materials -- Periodicals; Power resources -- Technological innovations -- Periodicals; Nanoscience; Nanostructured materials; Nanotechnology; Power resources -- Technological innovations; Periodicals; 621.042
• DOI: 10.1016/j.nanoen.2017.03.022
• Languages: English
• ISSNs: 2211-2855

Abstract

Abstract: Fiber-shaped supercapacitors (FSCs) are a promising candidate as power source or energy storage unit in wearable/stretchable electronics. However, it is still a significant challenge to design FSCs with excellent electrochemical performance while maintaining good flexibility to meet the requirement of wearable/stretchable electronics. Here, a flexible all-solid-state asymmetric FSCs has been rationally designed and successfully prepared with coaxial human hair/Ni/Graphene/MnO2 fiber as positive electrode and coaxial human hair/Ni/Graphene fiber as negative electrode. Importantly, the as-obtained FSCs show extraordinary flexibility and outstanding electrochemical performance with a wide potential window (1.8 V), excellent rate capability (up to 20, 000 mV s −1 ), fast frequency response ( τ 0 =55 ms), high volumetric energy density (1.81 mWh cm −3 ), long cycle stability. With the facile fabrication technology and low-cost raw materials, this strategy not only provides a reference for the construction of high-performance flexible FSCs, but also paves a new way to explore the next-generation portable/wearable energy storage devices. Graphical abstract: A novel type of human hair-based flexible knittable supercapacitor have proposed and designed, which exhibit ultra-high rate capability, high response frequency, wide operating voltage, and excellent cycle stability. Highlights: A flexible human hair/Ni/rGO/MnO2 fiber electrode is successfully constructed. The FSCs based on human hair/Ni/rGO/MnO2 fiber exhibit excellent performance. The FSCs follow the rules of series/parallel connections of ideal capacitor. These results make the FSCs a promising power source for flexible wear devices.