title: Flexible Fiber-Shaped Supercapacitor Based on Nickel-Cobalt Double Hydroxide and Pen Ink Electrodes on Metallized Carbon Fiber.
abstract: Flexible fiber-shaped supercapacitors (FSSCs) are recently of extensive interest for portable and wearable electronic gadgets. Yet the lack of industrial-scale flexible fibers with high conductivity and capacitance and low cost greatly limits its practical engineering applications. To this end, we here present pristine twisted carbon fibers (CFs) coated with a thin metallic layer via electroless deposition route, which exhibits exceptional conductivity with ∼300% enhancement and superior mechanical strength (∼1.8 GPa). Subsequently, the commercially available conductive pen ink modified high conductive composite fibers, on which uniformly covered ultrathin nickel-cobalt double hydroxides (Ni-Co DHs) were introduced to fabricate flexible FSSCs. The synthesized functionalized hierarchical flexible fibers exhibit high specific capacitance up to 1.39 F·cm-2in KOH aqueous electrolyte. The asymmetric solid-state FSSCs show maximum specific capacitance of 28.67 mF·cm-2and energy density of 9.57 μWh·cm-2at corresponding power density as high as 492.17 μW·cm-2in PVA/KOH gel electrolyte, with demonstrated high flexibility during stretching, demonstrating their potential in flexible electronic devices and wearable energy systems.
authors.affiliation: Department of Mechanical and Biomedical Engineering, City University of Hong Kong , Hong Kong SAR, Kowloon 999077, Hong Kong.
authors.forename: Libo
authors.initials: L
authors.lastname: Gao
authors.affiliation: Department of Mechanical and Biomedical Engineering, City University of Hong Kong , Hong Kong SAR, Kowloon 999077, Hong Kong.
authors.forename: James Utama
authors.initials: JU
authors.lastname: Surjadi
authors.affiliation: Department of Mechanical and Biomedical Engineering, City University of Hong Kong , Hong Kong SAR, Kowloon 999077, Hong Kong.
authors.forename: Ke
authors.initials: K
authors.lastname: Cao
authors.affiliation: Department of Mechanical and Biomedical Engineering, City University of Hong Kong , Hong Kong SAR, Kowloon 999077, Hong Kong.|Shenzhen Research Institute, City University of Hong Kong , Shenzhen 518057, China.
authors.forename: Hongti
authors.initials: H
authors.lastname: Zhang
authors.affiliation: Department of Mechanical and Biomedical Engineering, City University of Hong Kong , Hong Kong SAR, Kowloon 999077, Hong Kong.
authors.forename: Peifeng
authors.initials: P
authors.lastname: Li
authors.affiliation: Department of Mechanical and Biomedical Engineering, City University of Hong Kong , Hong Kong SAR, Kowloon 999077, Hong Kong.|Shenzhen Research Institute, City University of Hong Kong , Shenzhen 518057, China.
authors.forename: Shang
authors.initials: S
authors.lastname: Xu
authors.affiliation: Department of Mechanical and Biomedical Engineering, City University of Hong Kong , Hong Kong SAR, Kowloon 999077, Hong Kong.
authors.forename: Chenchen
authors.initials: C
authors.lastname: Jiang
authors.affiliation: Department of Mechanical and Biomedical Engineering, City University of Hong Kong , Hong Kong SAR, Kowloon 999077, Hong Kong.
authors.forename: Jian
authors.initials: J
authors.lastname: Song
authors.affiliation: Department of Mechanical and Biomedical Engineering, City University of Hong Kong , Hong Kong SAR, Kowloon 999077, Hong Kong.
authors.forename: Dong
authors.initials: D
authors.lastname: Sun
authors.affiliation: Department of Mechanical and Biomedical Engineering, City University of Hong Kong , Hong Kong SAR, Kowloon 999077, Hong Kong.|Shenzhen Research Institute, City University of Hong Kong , Shenzhen 518057, China.
authors.forename: Yang
authors.identifier: http://orcid.org/0000-0002-9280-2718
authors.initials: Y
authors.lastname: Lu
keywords: carbon fiber; flexible supercapacitor; nickel−cobalt double hydroxides; pen-ink electrode; wearable electronics