Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 7, Issue 50, Pages 27845-27852Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.5b09257
Keywords
nanomaterials; energy storage; tungsten oxide; microsupercapacitors; laser patterning
Funding
- National Institutes of Health [1DP2OD008678-01]
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Microsupercapacitors (MSCs) are promising energy storage devices to power miniaturized portable electronics and microelectromechanical systems. With the increasing attention on all-solid-state flexible supercapacitors, new strategies for high-performance flexible MSCs are highly desired. Here, we demonstrate all-solid-state, flexible micropseudocapacitors via direct laser patterning on crack-free, flexible WO3/polyvinylidene fluoride (PVDF)/multiwalled carbon nanotubes (MWCNTs) composites containing high levels of porous hierarchically structured WO3 nanomaterials (up to 50 wt %) and limited binder (PVDF, <25 wt %). The work leads to an areal capacitance of 62.4 mF.cm(-2) and a volumetric capacitance of 10.4 F.cm(-3), exceeding that of graphene based flexible MSCs by a factor of 26 and 3, respectively. As a noncarbon based flexible MSC, hierarchically nanostructured WO3 in the narrow finger electrode is essential to such enhancement in energy density due to its pseudocapacitive property. The effects of WO3/PVDF/MWCNTs composite composition and the dimensions of interdigital structure on the performance of the flexible MSCs are investigated.
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