Optimal Co(OH)₂ Nanowire Contents in Graphene Nanosheet Electrode on Its Electrochemical Performance of Supercapacitor

Jaeho Choi; Taesob Oh; Myeongjin Kim; Jinglei Yang; Jooheon Kim

doi:10.1166/jnn.2019.16195

Optimal Co(OH)₂ Nanowire Contents in Graphene Nanosheet Electrode on Its Electrochemical Performance of Supercapacitor

J Nanosci Nanotechnol. 2019 Mar 1;19(3):1350-1359. doi: 10.1166/jnn.2019.16195.

Authors

Jaeho Choi¹, Taesob Oh¹, Myeongjin Kim¹, Jinglei Yang², Jooheon Kim¹

Affiliations

¹ School of Chemical Engineering and Materials Science, Chung-Ang University, Seoul 156-756, Republic of Korea.
² Department of Mechanical and Aerospace Engineering, The Hong Kong University of Science and Technology, Hong Kong, SAR.

PMID: 30469187
DOI: 10.1166/jnn.2019.16195

Abstract

Graphene/Co(OH)₂ nanowire composite films were successfully synthesized using a simple three-step treatment, and the effect of the Co(OH)₂ nanowire content on the electrochemical properties of the composite films was studied in this study. One-dimensional Co(OH)₂ nanowires were homogeneously embedded and dispersed between the prepared graphene papers, forming a layered graphene/Co(OH)₂ nanowire hybrid structure. These composite films exhibited better electrochemical properties than the previously reported graphene composites with carbon spheres such as graphene/CNT composites. These graphene composites were fabricated using the same method we used in this study but without the addition of Co(OH)₂ nanowires. The addition of a small amount of Co(OH)₂ to reduced graphene oxide (rGO) (RGO:Co(OH)₂=5:1) yielded thick paper-like rGO/Co(OH)₂ sandwiches, which showed an excellent specific capacitance of 1032.57 Fg^-1 at a scan rate of 5 mVs^-1. These results indicate the potential of these composites for the development of highly capacitive energy storage devices for practical applications.