Superior asymmetric supercapacitor based on Ni-Co oxide nanosheets and carbon nanorods

Rutao Wang; Xingbin Yan

doi:10.1038/srep03712

Superior asymmetric supercapacitor based on Ni-Co oxide nanosheets and carbon nanorods

Sci Rep. 2014 Jan 16:4:3712. doi: 10.1038/srep03712.

Authors

Rutao Wang¹, Xingbin Yan²

Affiliations

¹ 1] Laboratory of Clean Energy Chemistry and Materials, Lanzhou Institute of Chemical Physics, Chinese of Academy of Sciences, Lanzhou, 730000, China [2] Graduate University of Chinese Academy of Sciences, Beijing, 100080, China.
² 1] Laboratory of Clean Energy Chemistry and Materials, Lanzhou Institute of Chemical Physics, Chinese of Academy of Sciences, Lanzhou, 730000, China [2] State Key Laboratory of Solid Lubrication, Lanzhou Institute of Chemical Physics, Chinese of Academy of Sciences, Lanzhou, 730000, China.

Abstract

Nickel and cobalt (Ni-Co) binary oxide nanosheets with mesoporous structure are prepared by a facile approach based on the formation and disassociation of nickel/cobalt-citrate complex, and they show an ultra-high Faradaic capacitance up to 1846 F g(-1) and excellent rate capability. On this basic, advanced aqueous asymmetric supercapacitors (AASs) are successfully built by using the Ni-Co oxide as the positive electrode and three kinds of activated carbons respectively as the negative electrode. As-made AASs are able to work reversibly in a full operated voltage region of 0-1.6 V and exhibit outstanding electrochemical performance. Among them, activated polyaniline-derived carbon (APDC)//Ni-Co oxide AASs shows the highest specific capacitance of 202 F g(-1), the maximum energy density of 71.7 Wh kg(-1), and superior combination of high energy and power density (a energy density of 41.6 Wh kg(-1) at a high power density of 16 kW kg(-1)).

Publication types

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