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Vol. 9 No. 4 (2017)

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

https://doi.org/10.1007/s40820-017-0141-9
Tinghui Yao
Key Laboratory of Special Function Materials and Structure Design of the Ministry of Education, Key Laboratory for Magnetism and Magnetic Materials of the Ministry of Education, and School of Physical Science and Technology, Lanzhou University, 222 South Tianshui Road, Lanzhou 730000, People’s Republic of China
Xin Guo
Key Laboratory of Special Function Materials and Structure Design of the Ministry of Education, Key Laboratory for Magnetism and Magnetic Materials of the Ministry of Education, and School of Physical Science and Technology, Lanzhou University, 222 South Tianshui Road, Lanzhou 730000, People’s Republic of China
Shengchun Qin
Key Laboratory of Special Function Materials and Structure Design of the Ministry of Education, Key Laboratory for Magnetism and Magnetic Materials of the Ministry of Education, and School of Physical Science and Technology, Lanzhou University, 222 South Tianshui Road, Lanzhou 730000, People’s Republic of China
Fangyuan Xia
Key Laboratory of Special Function Materials and Structure Design of the Ministry of Education, Key Laboratory for Magnetism and Magnetic Materials of the Ministry of Education, and School of Physical Science and Technology, Lanzhou University, 222 South Tianshui Road, Lanzhou 730000, People’s Republic of China
Qun Li
Key Laboratory of Special Function Materials and Structure Design of the Ministry of Education, Key Laboratory for Magnetism and Magnetic Materials of the Ministry of Education, and School of Physical Science and Technology, Lanzhou University, 222 South Tianshui Road, Lanzhou 730000, People’s Republic of China
Yali Li
Key Laboratory of Special Function Materials and Structure Design of the Ministry of Education, Key Laboratory for Magnetism and Magnetic Materials of the Ministry of Education, and School of Physical Science and Technology, Lanzhou University, 222 South Tianshui Road, Lanzhou 730000, People’s Republic of China
Qiang Chen
Institute of Electromagnetics and Acoustics, Department of Electronic Science, and Fujian Provincial Key Laboratory of Plasma and Magnetic Resonance, Xiamen University, Xiamen 361005, People’s Republic of China
Junshuai Li
Key Laboratory of Special Function Materials and Structure Design of the Ministry of Education, Key Laboratory for Magnetism and Magnetic Materials of the Ministry of Education, and School of Physical Science and Technology, Lanzhou University, 222 South Tianshui Road, Lanzhou 730000, People’s Republic of China
Deyan He
Key Laboratory of Special Function Materials and Structure Design of the Ministry of Education, Key Laboratory for Magnetism and Magnetic Materials of the Ministry of Education, and School of Physical Science and Technology, Lanzhou University, 222 South Tianshui Road, Lanzhou 730000, People’s Republic of China

Corresponding Author: Junshuai Li

jshli@lzu.edu.cn

Nano-Micro Letters, Vol. 9 No. 4 (2017), Article Number: 38

Abstract

In this study, the effect of reduced graphene oxide (rGO) on interconnected Co3O4 nanosheets and the improved supercapacitive behaviors is 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.


Highlights:


1 Interconnected Co3O4 nanosheets anchored on rGO-coated nickel foam (NF) are facilely synthesized using a green, simple, and low-cost approach.
2 Because of the high specific surface area and optimal mesopore size distribution, high specific capacitances of ~1016.4 and 767.1 F g−1 are achieved for Co3O4/rGO/NF at current densities of 1 and 5 A g−1, respectively.
3 Excellent stability with ~95.5% capacity retention at a high current density of 7 A g−1 is achieved even after 3000 cycles.

Keywords

Supercapacitors rGO Co3O4 nanosheets Strain relaxation
Yao, Tinghui, Xin Guo, Shengchun Qin, Fangyuan Xia, Qun Li, Yali Li, Qiang Chen, Junshuai Li, and Deyan He. 2017. “Effect of RGO Coating on Interconnected Co3O4 Nanosheets and Improved Supercapacitive Behavior of Co3O4/RGO/NF Architecture”. Nano-Micro Letters 9 (4):38. https://doi.org/10.1007/s40820-017-0141-9.
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