Aluminum‐Ion‐Intercalation Supercapacitors with Ultrahigh Areal Capacitance and Highly Enhanced Cycling Stability: Power Supply for Flexible Electrochromic Devices. Issue 19 (29th March 2017)

• Record Type: Journal Article
• Authors: Li, Kerui; Shao, Yuanlong; Liu, Shiyi; Zhang, Qinghong; Wang, Hongzhi; Li, Yaogang; Kaner, Richard B.
• Is Part Of: Small. Volume 13:Issue 19(2017)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2017-03-29
• Subjects: Al‐ion intercalation -- device integration -- electrochemical capacitor -- interpenetrating nanowire networks -- ultrahigh areal capacitance; Nanotechnology -- Periodicals; Nanoparticles -- Periodicals; Microtechnology -- Periodicals; 620.5
• DOI: 10.1002/smll.201700380
• Languages: English
• ISSNs: 1613-6810

Abstract

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 W18 O49 nanowires (W18 O49 NWs) 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 W18 O49 NWs and single‐walled carbon nanotubes. The as‐prepared composite electrode exhibits extremely high areal capacitances of 1.11–2.92 F cm −2 and 459 F cm −3 at 2 mA cm −2, enhanced electrochemical stability in the Al 3+ 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 −3 at 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. Abstract : A highly efficient Al‐ion intercalation into W18 O49 nanowires is demonstrated for electrochemical energy storage. A freestanding composite film with a hierarchically porous structure is prepared by vacuum‐filtration of a uniformly mixed dispersion containing W18 O49 nanowires and single‐walled carbon nanotubes, which exhibits ultrahigh areal capacitance and highly enhanced cycling stability.