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Kevlar‐Based Supercapacitor Fibers with Conformal Pseudocapacitive Metal Oxide and Metal Formed by ALD
Author(s) -
Daubert James S.,
Mundy J. Zachary,
Parsons Gregory N.
Publication year - 2016
Publication title -
advanced materials interfaces
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.671
H-Index - 65
ISSN - 2196-7350
DOI - 10.1002/admi.201600355
Subject(s) - materials science , supercapacitor , conformal coating , atomic layer deposition , electrolyte , capacitance , electrode , oxide , coating , nanotechnology , metal , composite material , layer (electronics) , chemical engineering , metallurgy , chemistry , engineering
Kevlar, poly( p ‐phenylene terephthalamide) (PPTA), yarns are modified for use as flexible supercapacitor electrodes by coating them with a nanometer‐scale film of conductive platinum metal and pseudocapacitive V 2 O 5 using atomic layer deposition (ALD). The PPTA yarns are incorporated into a solid‐state supercapacitor through the use of a polyvinyl alcohol/lithium chloride gel electrolyte. Pseudocapacitive V 2 O 5 films 11 nm thick provide up to a 5× increase in areal capacitance (18.4 mF cm −2 ) over the Pt‐only‐coated PPTA. Thicker films of V 2 O 5 and wrapping the electrodes together into a single yarn result in decreased areal capacitance due to charge‐transfer limitations. The work describes how ALD metal and metal oxide can be combined to add double layer and pseudocapacitive charge storage to mechanically robust PPTA creating unique multifunctional electronic fabric device systems.