Synthesis of hollow NiCo2O4 nanospheres with large specific surface area for asymmetric supercapacitors

Kaibing Xu; Jianmao Yang; Junqing Hu

doi:10.1016/j.jcis.2017.09.113

Synthesis of hollow NiCo₂O₄ nanospheres with large specific surface area for asymmetric supercapacitors

J Colloid Interface Sci. 2018 Feb 1:511:456-462. doi: 10.1016/j.jcis.2017.09.113. Epub 2017 Sep 30.

Authors

Kaibing Xu¹, Jianmao Yang², Junqing Hu³

Affiliations

¹ State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, Research Center for Analysis and Measurement, Donghua University, Shanghai 201620, China.
² State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, Research Center for Analysis and Measurement, Donghua University, Shanghai 201620, China. Electronic address: yangjm@dhu.edu.cn.
³ College of Materials Science and Engineering, Donghua University, Shanghai 201620, China.

PMID: 29035809
DOI: 10.1016/j.jcis.2017.09.113

Abstract

Hollow micro-/nanostructured electrode materials with high active surface area are highly desirable for achieving outstanding electrochemical properties. Herein, we report the successful synthesis of hierarchical hollow NiCo₂O₄ nanospheres with high surface area as electrode materials for supercapacitors. Electrochemical measurements prove that such electrode materials exhibit excellent electrochemical behavior with a specific capacitance reaching 1229 F/g at 1 A/g, remarkable rate performance (∼83.6% retention from 1 to 25 A/g) and good cycling performance (86.3% after 3000 cycles). Furthermore, the asymmetric supercapacitor is fabricated with hollow NiCo₂O₄ nanospheres electrode and activated carbon (AC) electrode as the positive and negative, respectively. This device exhibits a maximum energy density of 21.5 W h/kg, excellent cycling performance and coulombic efficiency. The results show that hollow NiCo₂O₄ nanosphere electrode is a promising electrode material for the future application in high performance supercapacitors.

Keywords: Asymmetric supercapacitor; High surface area; Hollow nanospheres; NiCo(2)O(4).