Nano-Micro Letters

A Self-Supported Graphene/Carbon Nanotube Hollow Fiber for Integrated Energy Conversion and Storage

Kai Liu1, #, Zilin Chen1, #, Tian Lv1, *, Yao Yao1, Ning Li1, Huili Li1, Tao Chen1, *

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Nano-Micro Lett. (2020) 12: 64

First Online: 25 February 2020 (Article)

DOI:10.1007/s40820-020-0390-x

*Corresponding author. E-mail: 18012@tongji.edu.cn (Tian Lv); tchen@tongji.edu.cn (Tao Chen)

 

Abstract

 


Toc

Wearable fiber-shaped integrated energy conversion and storage devices have attracted increasing attention, but it remains a big challenge to achieve a common fiber electrode for both energy conversion and storage with high performance. Here, we grow aligned carbon nanotubes (CNTs) array on continuous graphene (G) tube, their seamless connected structure provides the obtained G/CNTs composite fiber with a unique self-supported hollow structure. Taking advantage of the hollow structure, other active material (e.g., polyaniline, PANI) could be easily functionalized on both inner and outer surfaces of the tube, the obtained G/CNTs/PANI composite hollow fibers achieve a high mass loading (90%) of PANI. The G/CNTs/PANI composite hollow fibers can not only be used for high-performance fiber-shaped supercapacitor with large specific capacitance of 472 mF cm-2, but also replace platinum wire to build fiber-shaped dye-sensitized solar cell (DSSC) with a high power conversion efficiency of 4.20%. As desired, the integrated device of DSSC and supercapacitor with the G/CNTs/PANI composite hollow fiber used as the common electrode, exhibit a total power conversion and storage efficiency as high as 2.1%. Furthermore, the self-supported G/CNTs hollow fiber could be further functionalized with other active materials for building other flexible and wearable electronics.


 

Keywords

Carbon nanotube; Graphene; Integrated; Energy conversion; Energy storage

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