Three-dimensional porous ZnCo(2)O(4) sheet array coated with Ni(OH)(2) for high-performance asymmetric supercapacitor

Yu Pan; Hong Gao; Mingyi Zhang; Lu Li; Guangning Wang; Xinyuan Shan

doi:10.1016/j.jcis.2017.02.053

Three-dimensional porous ZnCo(2)O(4) sheet array coated with Ni(OH)(2) for high-performance asymmetric supercapacitor

J Colloid Interface Sci. 2017 Jul 1:497:50-56. doi: 10.1016/j.jcis.2017.02.053. Epub 2017 Feb 24.

Authors

Yu Pan¹, Hong Gao², Mingyi Zhang³, Lu Li¹, Guangning Wang¹, Xinyuan Shan¹

Affiliations

¹ Key Laboratory for Photonic and Electronic Bandgap Materials, Ministry of Education, School of Physics and Electronic Engineering, Harbin Normal University, Harbin 150025, PR China.
² Key Laboratory for Photonic and Electronic Bandgap Materials, Ministry of Education, School of Physics and Electronic Engineering, Harbin Normal University, Harbin 150025, PR China. Electronic address: [email protected].
³ Key Laboratory for Photonic and Electronic Bandgap Materials, Ministry of Education, School of Physics and Electronic Engineering, Harbin Normal University, Harbin 150025, PR China; Center for Advanced Optoelectronic Functional Materials Research, Key Laboratory of UV Light-Emitting Materials and Technology of Ministry of Education, Northeast Normal University, Changchun 130024, PR China.

PMID: 28260675
DOI: 10.1016/j.jcis.2017.02.053

Abstract

Hierarchical ZnCo₂O₄@Ni(OH)₂ sheet composite structures on Ni foam were rationally designed and successfully synthesized. The ZnCo₂O₄ micro-sheets grown on Ni foam served as the skeleton to improve the electrical conductivity of redox active Ni(OH)₂ materials, providing more electroactive sites for the faradaic reaction, and solidify the Ni(OH)₂ materials onto Ni foam as a current collector. The electrode of ZnCo₂O₄@Ni(OH)₂ showed an ultrahigh areal capacitance of 4.6F/cm² at a current density of 2mA/cm². A lightweight and small asymmetric supercapacitor (ASC) device was successfully fabricated using the ZnCo₂O₄@Ni(OH)₂ and carbonized filter paper (CFP) as positive and negative electrode, respectively. The ASC could work in a large potential window of 0-1.8V and achieve a high energy density of 49Wh/kg at 428W/kg.

Keywords: Asymmetric supercapacitor; Composite electrode; High areal capacitance; High energy density; ZnCo(2)O(4)@Ni(OH)(2).

Publication types

Research Support, Non-U.S. Gov't