Abstract
HighlightsA novel self-supported hollow fiber with CNT array grown from graphene layer is designed and developed. The fiber provides a perfect conductive platform to deposit PANI on both inner and outer surfaces of the fiber with high mass loading.With G/CNTs/PANI hollow fiber as a common electrode, an integrated energy device with a total power conversion and storage efficiency of 2.1% is realized.
Highlights
Due to their unique structure, fiber-shaped electronics show advantages of excellent flexibility and lightweight, and can be woven or integrated into any other textiles, attracting great attentions from various fields, such as sensors [1,2,3,4,5], intelligent skins [6, 7], and biomedicine [8,9,10]
(1) Continuous few-layer graphene was grown around a nickel wire; a layer of catalyst and a buffer layer of Al2O3 were successively deposited around CVDgrown graphene of Ni wire by e-beam evaporation. (2) Vertically aligned carbon nanotubes (CNTs) were grown around graphene on Ni wire through a second chemical vapor deposition (CVD) process. (3) The selfsupported hollow G/CNTs fiber was achieved after etching off Ni wire substrate, and any other active materials (e.g., PANI) could be grown on both inner and outer surface of the obtained hollow G/CNTs fibers
Due to the support effect of CNTs directly grown from continuous graphene tube, the obtained G/CNTs hybrid fibers exhibited a unique self-supported hollow structure, which enabled them to being further functionalized with other active materials on both inner and outer surfaces of the tubes
Summary
Due to their unique structure, fiber-shaped electronics show advantages of excellent flexibility and lightweight, and can be woven or integrated into any other textiles, attracting great attentions from various fields, such as sensors [1,2,3,4,5], intelligent skins [6, 7], and biomedicine [8,9,10]. Electrochemical supercapacitors with high power density and long cycling life that could be fabricated in fiber-like format through simple and environment-friendly approaches have been intensely investigated so far [16,17,18] For both fiber-shaped solar cells and supercapacitors, high conducting fiber electrodes are one of the most important parts in these fibershaped devices and play an important role in their performance. It remains a big challenge to achieve a common fiber electrode for building of integrated energy conversion and storage devices with high performance Benefiting from their large specific area, excellent mechanical, electrical, and electrochemical properties, carbon nanotubes (CNTs) and graphene have been widely used as efficient electrode materials for energy relative devices containing solar cells and supercapacitors [19,20,21,22,23]. The developed fiber-shaped integrated device containing a DSSC and a supercapacitor exhibited a high overall photoelectric conversion and storage efficiency of 2.1%
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