title: High Performance All-Solid-State Flexible Micro-Pseudocapacitor Based on Hierarchically Nanostructured Tungsten Trioxide Composite.
abstract: 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.
authors.affiliation: Materials Science Program, Department of Electrical and Computer Engineering, University of Wisconsin-Madison , Madison, Wisconsin 53706, United States.
authors.forename: Xuezhen
authors.initials: X
authors.lastname: Huang
authors.affiliation: Materials Science Program, Department of Electrical and Computer Engineering, University of Wisconsin-Madison , Madison, Wisconsin 53706, United States.
authors.forename: Hewei
authors.initials: H
authors.lastname: Liu
authors.affiliation: Materials Science Program, Department of Electrical and Computer Engineering, University of Wisconsin-Madison , Madison, Wisconsin 53706, United States.
authors.forename: Xi
authors.initials: X
authors.lastname: Zhang
authors.affiliation: Materials Science Program, Department of Electrical and Computer Engineering, University of Wisconsin-Madison , Madison, Wisconsin 53706, United States.
authors.forename: Hongrui
authors.initials: H
authors.lastname: Jiang
mesh_terms: D025802:Electric Capacitance; D006108:Graphite / Q000737:chemistry; D007834:Lasers; D049329:Nanostructures / Q000737:chemistry*; D037742:Nanotubes, Carbon / Q000737:chemistry; D053770:Nanowires / Q000737:chemistry*; D010087:Oxides / Q000737:chemistry*; D016062:Porosity; D014414:Tungsten / Q000737:chemistry*
chemical_list: D037742:Nanotubes, Carbon; D010087:Oxides; D006108:Graphite; C511604:tungsten oxide; D014414:Tungsten
keywords: energy storage; laser patterning; microsupercapacitors; nanomaterials; tungsten oxide