title: Enhanced Structural Stability of Nickel-Cobalt Hydroxide via Intrinsic Pillar Effect of Metaborate for High-Power and Long-Life Supercapacitor Electrodes.
abstract: Layered α-Ni(OH)2and its derivative bimetallic hydroxides (e.g., α-(Ni/Co)(OH)2) have attracted much attention due to their high specific capacitance, although their insufficient cycling stability has blocked their wide application in various technologies. In this work, we demonstrate that the cycling performance of α-(Ni/Co)(OH)2can be obviously enhanced via the intrinsic pillar effect of metaborate. Combining the high porosity feature of the metaborate stabilized α-(Ni/Co)(OH)2and the improved electronic conductivity offered by graphene substrate, the average capacitance fading rate of the metaborate stabilized α-(Ni/Co)(OH)2is only ∼0.0017% per cycle within 10 000 cycles at the current density of 5 A g-1. The rate performance is excellent over a wide temperature range from -20 to 40 °C. We believe that the enhancements should mainly be ascribed to the excellent structural stability offered by the metaborate pillars, and the detailed mechanism is discussed.
authors.affiliation: The State Key Laboratory for Mechanical Behavior of Materials, School of Materials Science and Engineering, Xi'an Jiaotong University , Xi'an 710049, PR China.|Institute for Superconducting & Electronic Materials, University of Wollongong , Wollongong, NSW 2500, Australia.
authors.forename: Yuanzhen
authors.initials: Y
authors.lastname: Chen
authors.affiliation: Institute for Superconducting & Electronic Materials, University of Wollongong , Wollongong, NSW 2500, Australia.|Australian Centre for Neutron Scattering, Australian Nuclear Science and Technology Organisation , Locked Bag 2001, Kirrawee DC, NSW 2232, Australia.
authors.forename: Wei Kong
authors.initials: WK
authors.lastname: Pang
authors.affiliation: The State Key Laboratory for Mechanical Behavior of Materials, School of Materials Science and Engineering, Xi'an Jiaotong University , Xi'an 710049, PR China.
authors.forename: Haihua
authors.initials: H
authors.lastname: Bai
authors.affiliation: Institute for Superconducting & Electronic Materials, University of Wollongong , Wollongong, NSW 2500, Australia.
authors.forename: Tengfei
authors.initials: T
authors.lastname: Zhou
authors.affiliation: The State Key Laboratory for Mechanical Behavior of Materials, School of Materials Science and Engineering, Xi'an Jiaotong University , Xi'an 710049, PR China.
authors.forename: Yongning
authors.initials: Y
authors.lastname: Liu
authors.affiliation: School of Chemistry and Chemical Engineering, Xi'an University of Science and Technology , Xi'an 710054, PR China.
authors.forename: Sai
authors.initials: S
authors.lastname: Li
authors.affiliation: Institute for Superconducting & Electronic Materials, University of Wollongong , Wollongong, NSW 2500, Australia.
authors.forename: Zaiping
authors.identifier: 0000-0003-3464-5301
authors.initials: Z
authors.lastname: Guo
keywords: Pillar effect; bimetallic hydroxides; graphene; metaborate; supercapacitor