低缺陷密度石墨烯与Co<sub>3</sub>O<sub>4</sub>复合材料的制备及电化学性能

doi:10.11896/cldb.19030268

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Abstract Co₃O₄/graphene composites have drawn more and more attentions, which was due to their high specific capacitance and good stability. However, reduced graphene oxide was commonly used for Co₃O₄/graphene composites, which was due to the groups on graphene sheets and its good dispersibility. The defects of reduced graphene oxide (RGO) limited the electrochemical properties of the composite. Moreover, heat treating of hydroxide/graphene oxide was commonly involved for synthesis of Co₃O₄/graphene composite. In this paper, low-defect density graphene nanoplatelets (GNP) were prepared by mechanical exfoliation, and a stable suspension of GNP and Co ions was obtained. The Co₃O₄/GNP composites were obtained by one-step method without further heat treatment. The thickness of the GNP sheets synthesized via mechanical exfoliation was about five layers and the layer spacing was 3.6 . The I_D/I_G ratio from the Raman spectrum was only 0.07, indicating that the GNP has lower defects density than that of RGO. Co₃O₄/GNP composites were prepared by one-step method using H₂O₂ as oxidant. The average particle size of square Co₃O₄ nanoparticles was about 12 nm. Electrochemical studies show that the specific capacitance of Co₃O₄/GNP composites reached 542 F·g^-1 when weight ratio of Co₃O₄ and GNP was 8:1, and the internal resistance was only 1.57 Ω. The internal resistance of the composite increased with the amount of GNP. When weight ratio of Co₃O₄ and GNP was 3:1, the internal resistance was only 0.89 Ω. This work realized one-step synthesis of Co₃O₄/graphene composites. The graphene synthesized via mechanical exfoliation has a low defect density, and the one-step method ensures uniformly distribution of Co₃O₄ nanoparticles on GNP surface. The specific capacitance of composites reached 542 F·g^-1.

Key words： graphene Co₃O₄ supercapacitor electrochemical property

Published: 31 July 2019

CLC number:

TQ02

Fund:This work was financially supported by the National Natural Science Foundation of China (51602084), University Nursing Program for Young Scholars with Creative Talents in Heilongjiang Province (UNPYSCT-2017090), Heilongjiang Natural Science Foundation (YQ2019E030) and Fundation for Universities of Heilongjiang Provinc (LGYC2018JC032).

About author:: Yongliang Wangreceived his B.E. degree in inorga-nic and nonmetallic material engineering at Jun. 2005. He received his Ph.D. degree in materials science and engineering from the Harbin Institute of Technology (HIT) at Jun. 2011. He is an associate professor of Harbin University of Science and Technology. He has published more than 20 journal papers, applied 8 national invention patents and 5 of them were authorized. In addition, he acquired the award of University Nur-sing Program for Young Scholars with Creative Talents in Heilongjiang Pro-vince. His research interest focus on grapheme based composites and inorga-nic/organic composites. His research works have been supported by a natio-nal natural science foundation of China, China postdoctoral science foundation, university nursing program for young scholars with creative talents in Heilongjiang province and natural science foundation of Heilongjiang Pro-vince.

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	WANG Yongliang
	WANG Chunfeng
	MA Rongxin
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Cite this article:

WANG Yongliang,WANG Chunfeng,MA Rongxin, et al. Preparation and Electrochemical Property of Graphene/Co₃O₄ Composite[J]. Materials Reports, 2019, 33(18): 3156-3160.

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http://www.mater-rep.com/EN/10.11896/cldb.19030268 OR http://www.mater-rep.com/EN/Y2019/V33/I18/3156

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