title: Metal-Organic Coaxial Nanowire Array Electrodes Combining Large Energy Capacity and High Rate Capability.
abstract: Pseudocapacitors have been widely studied in the context of their potential applications in portable electronics and energy regeneration. However, the internal resistance within these devices hampers charge transport and limits their performance. As a result, maximum charge/discharge rates are typically limited to a few hundred mV s-1for pseudocapacitors. Beyond this limit, capacitance rapidly decreases and devices become incapable of storing energy. Here, we design electrodes in which coaxial nanowires made of highly conductive metal cores and pseudocapacitive organic shells are fabricated into a seamless, monolithic, and vertically aligned structure. The design of this structure reduces its internal resistance, and devices fabricated using these electrodes exhibit excellent energy capacity even when charged/discharged at high rates of more than a few hundred mV s-1. The energy density obtained in these devices corresponds to the maximum energy density predicted by the Trasatti method, and the coaxial-nanowire structure of the electrodes enhances the charge storage capacity and rate capability simultaneously.
authors.affiliation: Department of Macromolecular Science and Engineering, Graduate School of Science and Technology, Kyoto Institute of Technology, Matsugasaki, Kyoto, 606-8585, Japan.
authors.forename: Hideyuki
authors.initials: H
authors.lastname: Nakanishi
authors.affiliation: Department of Macromolecular Science and Engineering, Graduate School of Science and Technology, Kyoto Institute of Technology, Matsugasaki, Kyoto, 606-8585, Japan.
authors.forename: Ikuo
authors.initials: I
authors.lastname: Kikuta
authors.affiliation: Research Center for Functional Materials, National Institute for Materials Science (NIMS), Tsukuba, Ibaraki, 305-0044, Japan.
authors.forename: Hiroyo
authors.initials: H
authors.lastname: Segawa
authors.affiliation: Department of Macromolecular Science and Engineering, Graduate School of Science and Technology, Kyoto Institute of Technology, Matsugasaki, Kyoto, 606-8585, Japan.
authors.forename: Yuto
authors.initials: Y
authors.lastname: Kawabata
authors.affiliation: Department of Macromolecular Science and Engineering, Graduate School of Science and Technology, Kyoto Institute of Technology, Matsugasaki, Kyoto, 606-8585, Japan.
authors.forename: Reiko
authors.initials: R
authors.lastname: Kishida
authors.affiliation: Department of Macromolecular Science and Engineering, Graduate School of Science and Technology, Kyoto Institute of Technology, Matsugasaki, Kyoto, 606-8585, Japan.
authors.forename: Tomohisa
authors.initials: T
authors.lastname: Norisuye
authors.affiliation: Department of Macromolecular Science and Engineering, Graduate School of Science and Technology, Kyoto Institute of Technology, Matsugasaki, Kyoto, 606-8585, Japan.
authors.forename: Qui
authors.initials: Q
authors.lastname: Tran-Cong-Miyata
mesh_terms: D025802:Electric Capacitance; D011211:Electric Power Supplies; D004566:Electrodes; D008670:Metals / Q000737:chemistry; D053770:Nanowires / Q000737:chemistry*; D009930:Organic Chemicals / Q000737:chemistry
chemical_list: D008670:Metals; D009930:Organic Chemicals
keywords: energy storage; nanowires; polypyrrole; pseudocapacitors; supercapacitors