Journal
CHEMICAL ENGINEERING JOURNAL
Volume 411, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2021.128522
Keywords
Fiber-shaped; Supercapacitors; Asymmetrical; Core-sheath; All-solid-state
Categories
Funding
- National Natural Science Foundation of China [21875091, 51672114]
- Natural Science Foundation of Jiangsu province [BK20171295, BK20161357]
- China Postdoctoral Science Foundation [2020M671358]
- Postgraduate Research & Practice Innovation Program of Jiangsu Province [KYCX18_2235]
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An innovative asymmetrical fiber-shaped supercapacitor, AFSSCs-ICS, with encapsulated core-sheath architecture has been successfully constructed for wearable electronics. It demonstrates high energy density and excellent electrochemical and mechanical stabilities.
Fiber-shaped supercapacitors (FSSCs) have attracted increasing attention for wearable electronics. Herein, an asymmetrical fiber-shaped supercapacitor, AFSSCs-ICS, with an innovative encapsulated core-sheath architecture has been successfully constructed for the first time. The sword-scabbard inspired AFSSCs-ICS was fabricated by simply inserting a 'sword' positive electrode, PPy-MWCNTs-silk, into one tubular graphene 'scabbard' negative electrode with H2SO4/PVA gel as electrolyte. Notably, our newly designed PPy-MWCNTs-silk electrode had an ultrahigh length specific capacitance of 15.3 mF cm(-1) (corresponding to high areal or volumetric capacitance of 676.9 mF cm(-2) or 376.3 F cm(-3)), representing one of the highest levels among the fabric yarn derived electrodes, while the hollow graphene tube depicted a superior linear capacitance of 19.1 mF cm(-1), which could match well with that of the PPy-MWCNTs-silk electrode. Benefiting from the innovative yet rational structure, and ideally balanced charges, the AFSSCs-ICS had an extended operating potential of 1.6 V, and an outstanding length specific capacitance of 2.3 mF cm(-1) with a very admirable energy density of 0.8 mu Wh cm(-1), dramatically surpassing numerous reported FSSCs. Moreover, the AFSSCs-ICS device also afforded superb electrochemical and mechanical stabilities with retentions of 81% after 3000 charging-discharging cycles and 95-105% under bending degrees from 0 to 150 degrees. This study may pave a new way for constructing coaxial fiber shaped energy source unit for next-generation wearable and portable miniaturized electronics.
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