title: Unifying miscellaneous performance criteria for a prototype supercapacitor via Co(OH)2active material and current collector interactions.
abstract: The use of transition metal oxides and hydroxides in supercapacitors can yield high specific capacity electrodes. However, the effect of interaction between active material and current collector has remained unexplored. Here the behaviour of electrodeposited hexagonal cobalt hydroxide nanosheets on a variety of substrates was investigated, and the resulting valence bonding, morphological evolutions and phase transformations examined. It is shown that the electrochemical activity of the face centred cubic (FCC) Ni substrate dramatically decreases cyclability, the FCC Cu substrate also demonstrates decreased performance, and hexagonal carbon nanofibre (CNF) and Ti substrates exhibit far more stability. The miscellaneous roles of valence bonding, redox reactions and crystal structure mismatch between active material and current collector are examined, and their consequences discussed. Using the resulting insights into performance criteria, it was possible to select a suitable substrate for the fabrication of an asymmetric supercapacitor. The high performance and stability of the device demonstrates the usefulness of this approach, and the utility of applying these insights to energy storage devices.
authors.affiliation: Department of Materials Science, and Key Laboratory of Mobile Materials MOE, and State Key Laboratory of Automotive Simulation and Control, Jilin University, Changchun, China.
authors.forename: H X
authors.initials: HX
authors.lastname: Wang
authors.affiliation: Department of Materials Science, and Key Laboratory of Mobile Materials MOE, and State Key Laboratory of Automotive Simulation and Control, Jilin University, Changchun, China.|CIC Energigune, ParqueTecnológico de Álava, Miñano, Spain.|Ikerbasque, Basque Foundation for Science, Bilbao, Spain.
authors.forename: W
authors.initials: W
authors.lastname: Zhang
authors.affiliation: CIC Energigune, ParqueTecnológico de Álava, Miñano, Spain.
authors.forename: N E
authors.initials: NE
authors.lastname: Drewett
authors.affiliation: Department of Materials Science, and Key Laboratory of Mobile Materials MOE, and State Key Laboratory of Automotive Simulation and Control, Jilin University, Changchun, China.
authors.forename: H B
authors.initials: HB
authors.lastname: Zhang
authors.affiliation: State Key Laboratory of Inorganic Synthesis and Preparative Chemistry, College of Chemistry, Jilin University, Changchun, China.
authors.forename: K K
authors.initials: KK
authors.lastname: Huang
authors.affiliation: State Key Laboratory of Inorganic Synthesis and Preparative Chemistry, College of Chemistry, Jilin University, Changchun, China.
authors.forename: S H
authors.initials: SH
authors.lastname: Feng
authors.affiliation: Shanghai Synchrotron Radiation Facility (SSRF), Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai, China.
authors.forename: X L
authors.initials: XL
authors.lastname: Li
authors.affiliation: Department of Electron Microscopy Research, Korea Basic Science Institute, Daejeon, South Korea.
authors.forename: J
authors.initials: J
authors.lastname: Kim
authors.affiliation: Department of Electron Microscopy Research, Korea Basic Science Institute, Daejeon, South Korea.
authors.forename: S
authors.initials: S
authors.lastname: Yoo
authors.affiliation: Department of Materials Science, and Key Laboratory of Mobile Materials MOE, and State Key Laboratory of Automotive Simulation and Control, Jilin University, Changchun, China.
authors.forename: T
authors.initials: T
authors.lastname: Deng
authors.affiliation: Department of Materials Science, and Key Laboratory of Mobile Materials MOE, and State Key Laboratory of Automotive Simulation and Control, Jilin University, Changchun, China.
authors.forename: S J
authors.initials: SJ
authors.lastname: Liu
authors.affiliation: Department of Materials Science, and Key Laboratory of Mobile Materials MOE, and State Key Laboratory of Automotive Simulation and Control, Jilin University, Changchun, China.
authors.forename: D
authors.initials: D
authors.lastname: Wang
authors.affiliation: Department of Materials Science, and Key Laboratory of Mobile Materials MOE, and State Key Laboratory of Automotive Simulation and Control, Jilin University, Changchun, China.
authors.forename: W T
authors.initials: WT
authors.lastname: Zheng
keywords: Cobalt hydroxides; crystal structures; current collectors; redox reactions; valence bonding