Self-assembly of CoS2/graphene nanoarchitecture by a facile one-pot route and its improved electrochemical Li-storage properties

• Published in: Nano energy Vol. 2; no. 1; pp. 49 - 56
• Main Authors: Xie, Jian, Liu, Shuangyu, Cao, Gaoshao, Zhu, Tiejun, Zhao, Xinbing
• Format: Journal Article
• Language: English
• Published: Amsterdam Elsevier Ltd 01.01.2013; Elsevier
• Subjects: Applied sciences; Cobalt sulfide; Cross-disciplinary physics: materials science; rheology; Direct energy conversion and energy accumulation; Electrical engineering. Electrical power engineering; Electrical power engineering; Electrochemical conversion: primary and secondary batteries, fuel cells; Electrochemical property; Exact sciences and technology; Fullerenes and related materials; diamonds, graphite; Graphene; Li battery; Materials science; Methods of nanofabrication; Nanoarchitecture; Nanocrystalline materials; Nanoscale materials and structures: fabrication and characterization; Physics; Self-assembly; Specific materials; Nanoarchitecture; Cobalt sulfide; Li battery; Graphene; Electrochemical property; Lithium ion batteries; Nanosheet; Nanostructures; Electrochemical storage; Start-up; Nanoparticles; Self-assembly; Wettability; Hydrothermal synthesis; Nanocomposites; Graphite; Growth mechanism; Nanostructured materials; Nanocrystal
• ISSN: 2211-2855
• DOI: 10.1016/j.nanoen.2012.07.010

A CoS2/graphene nanoarchitecture was synthesized by a facile one-step hydrothermal route using graphite oxide, thioacetamide, and CoCl2·6H2O as the starting materials. The growth of CoS2 and the reduction of the graphite oxide occur simultaneously. CoS2 nanocrystals with a size of 100−150nm are uniformly anchored on the both sides of the graphene nanosheets, forming a unique CoS2/graphene hybrid nanostructure. The electrochemical tests showed that the nanocomposite exhibits obviously enhanced Li-storage properties compared with bare CoS2. The improvement in electrochemical properties could be attributed to the formation of two-dimensional conductive networks, homogeneous dispersion and immobilization of CoS2 nanoparticles, and the enhanced wetting of active material with the electrolyte by in situ introduced graphene nanosheets. [Display omitted] ► We synthesized CoS2/graphene nanoarchitecture by a facile one-pot route. ► CoS2/graphene exhibits improved Li-storage properties than bare CoS2. ► The graphene offers combined buffering, conducting, and immobilizing effects.