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Metal–Organic Coaxial Nanowire Array Electrodes Combining Large Energy Capacity and High Rate Capability
Author(s) -
Nakanishi Hideyuki,
Kikuta Ikuo,
Segawa Hiroyo,
Kawabata Yuto,
Kishida Reiko,
Norisuye Tomohisa,
TranCongMiyata Qui
Publication year - 2017
Publication title -
chemsuschem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.412
H-Index - 157
eISSN - 1864-564X
pISSN - 1864-5631
DOI - 10.1002/cssc.201601310
Subject(s) - pseudocapacitor , coaxial , materials science , nanowire , capacitance , electrode , optoelectronics , energy storage , context (archaeology) , nanotechnology , electrical conductor , supercapacitor , composite material , chemistry , computer science , telecommunications , paleontology , power (physics) , physics , quantum mechanics , biology
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 −1 for 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.