title: Aluminum-Ion-Intercalation Supercapacitors with Ultrahigh Areal Capacitance and Highly Enhanced Cycling Stability: Power Supply for Flexible Electrochromic Devices.
abstract: Electrochemical capacitor systems based on Al ions can offer the possibilities of low cost and high safety, together with a three-electron redox-mechanism-based high capacity, and thus are expected to provide a feasible solution to meet ever-increasing energy demands. Here, highly efficient Al-ion intercalation into W18O49nanowires (W18O49NWs) with wide lattice spacing and layered single-crystal structure for electrochemical storage is demonstrated. Moreover, a freestanding composite film with a hierarchical porous structure is prepared through vacuum-assisted filtration of a mixed dispersion containing W18O49NWs and single-walled carbon nanotubes. The as-prepared composite electrode exhibits extremely high areal capacitances of 1.11-2.92 F cm-2and 459 F cm-3at 2 mA cm-2, enhanced electrochemical stability in the Al3+electrolyte, as well as excellent mechanical properties. An Al-ion-based, flexible, asymmetric electrochemical capacitor is assembled that displays a high volumetric energy density of 19.0 mWh cm-3at a high power density of 295 mW cm-3. Finally, the Al-ion-based asymmetric supercapacitor is used as the power source for poly(3-hexylthiophene)-based electrochromic devices, demonstrating their promising capability in flexible electronic devices.
authors.affiliation: State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, College of Materials Science and Engineering, Donghua University, Shanghai, 201620, P. R. China.
authors.forename: Kerui
authors.initials: K
authors.lastname: Li
authors.affiliation: State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, College of Materials Science and Engineering, Donghua University, Shanghai, 201620, P. R. China.|Cambridge Graphene Center, Department of Engineering, University of Cambridge, Cambridge, CB3 0FA, UK.
authors.forename: Yuanlong
authors.initials: Y
authors.lastname: Shao
authors.affiliation: State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, College of Materials Science and Engineering, Donghua University, Shanghai, 201620, P. R. China.
authors.forename: Shiyi
authors.initials: S
authors.lastname: Liu
authors.affiliation: Engineering Research Center of Advanced Glasses Manufacturing Technology, Ministry of Education, Donghua University, Shanghai, 201620, P. R. China.
authors.forename: Qinghong
authors.initials: Q
authors.lastname: Zhang
authors.affiliation: State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, College of Materials Science and Engineering, Donghua University, Shanghai, 201620, P. R. China.
authors.forename: Hongzhi
authors.initials: H
authors.lastname: Wang
authors.affiliation: Engineering Research Center of Advanced Glasses Manufacturing Technology, Ministry of Education, Donghua University, Shanghai, 201620, P. R. China.
authors.forename: Yaogang
authors.initials: Y
authors.lastname: Li
authors.affiliation: Department of Chemistry and Biochemistry, California NanoSystems Institute, University of California, Los Angeles (UCLA), Los Angeles, CA, 90095, USA.
authors.forename: Richard B
authors.initials: RB
authors.lastname: Kaner
keywords: Al-ion intercalation; device integration; electrochemical capacitor; interpenetrating nanowire networks; ultrahigh areal capacitance