title: Extraordinary Supercapacitor Performance of a Multicomponent and Mixed-Valence Oxyhydroxide.
abstract: We report a novel multicomponent mixed-valence oxyhydroxide-based electrode synthesized by electrochemical polarization of a de-alloyed nanoporous NiCuMn alloy. The multicomponent oxyhydroxide has a high specific capacitance larger than 627 F cm(-3) (1097±95 F g(-1) ) at a current density of 0.25 A cm(-3) , originating from multiple redox reactions. More importantly, the oxyhydroxide electrode possesses an extraordinarily wide working-potential window of 1.8 V in an aqueous electrolyte, which far exceeds the theoretically stable window of water. The realization of both high specific capacitance and high working-potential windows gives rise to a high energy density, 51 mWh cm(-3) , of the multicomponent oxyhydroxide-based supercapacitor for high-energy and high-power applications.
authors.affiliation: School of Materials Science and Engineering and State Key Laboratory of Separation Membranes and Membrane Processes, Tianjin Polytechnic University, Tianjin 300387 (China).|WPI Advanced Institute for Materials Research, Tohoku University, Sendai 980-8577 (Japan).
authors.forename: Jianli
authors.initials: J
authors.lastname: Kang
authors.affiliation: WPI Advanced Institute for Materials Research, Tohoku University, Sendai 980-8577 (Japan).
authors.forename: Akihiko
authors.initials: A
authors.lastname: Hirata
authors.affiliation: WPI Advanced Institute for Materials Research, Tohoku University, Sendai 980-8577 (Japan).
authors.forename: Luyang
authors.initials: L
authors.lastname: Chen
authors.affiliation: WPI Advanced Institute for Materials Research, Tohoku University, Sendai 980-8577 (Japan).
authors.forename: Shengli
authors.initials: S
authors.lastname: Zhu
authors.affiliation: WPI Advanced Institute for Materials Research, Tohoku University, Sendai 980-8577 (Japan).
authors.forename: Takeshi
authors.initials: T
authors.lastname: Fujita
authors.affiliation: WPI Advanced Institute for Materials Research, Tohoku University, Sendai 980-8577 (Japan). mwchen@wpi-aimr.tohoku.ac.jp.|CREST (Japan) Science and Technology Agency (JST), Saitama 332-0012 (Japan). mwchen@wpi-aimr.tohoku.ac.jp.|State Key Laboratory of Metal Matrix Composites, School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai 200030 (China). mwchen@wpi-aimr.tohoku.ac.jp.
authors.forename: Mingwei
authors.initials: M
authors.lastname: Chen
keywords: multicomponent oxides; nanoporous metals; oxyhydroxides; polarization; supercapacitors