19October2017

Nano-Micro Letters

Effect of rGO Coating on Interconnected Co3O4 Nanosheets and Improved Supercapacitive Behavior of Co3O4/rGO/NF Architecture

Tinghui Yao1, Xin Guo1, Shengchun Qin1, Fangyuan Xia1, Qun Li1, Yali Li1, Qiang Chen2, Junshuai Li1,*, Deyan He1,*

Abstract
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Nano-Micro Lett. (2017) 9: 38

First Online: 26 January 2017 (Article)

DOI:10.1007/s40820-017-0141-9

*Corresponding author. E-mail: jshli@lzu.edu.cn, hedy@lzu.edu.cn

 

Abstract

 


Fig. 1 Schematic of the synthesis procedures of Co3O4/rGO/NF (top) and Co3O4/NF (bottom)

In this study, the effect of reduced graphene oxide (rGO) on interconnected Co3O4 nanosheets and the improved supercapacitive behaviors are reported. By optimizing the experimental parameters, we achieved a specific capacitance of ~1016.4 F g-1 for the Co3O4/rGO/NF (nickel foam) system at a current density of 1 A g-1. However, the Co3O4/NF structure without rGO only delivers a specific capacitance of ~520.0 F g-1 at the same current density. The stability test demonstrates that Co3O4/rGO/NF retains ~95.5% of the initial capacitance value even after 3000 charge-discharge cycles at a high current density of 7 A g-1. Further investigation reveals that capacitance improvement for the Co3O4/rGO/NF structure is mainly because of a higher specific surface area (~87.8 m2 g-1) and a more optimal mesoporous size (4–15 nm) compared to the corresponding values of 67.1 m2 g-1 and 6–25 nm, respectively, for the Co3O4/NF structure. rGO and the thinner Co3O4 nanosheets benefit from the strain relaxation during the charge and discharge processes, improving the cycling stability of Co3O4/rGO/NF.


 

Keywords

Supercapacitors; rGO; Co3O4 nanosheets; Strain relaxation

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