摘要
采用一步水热法制备石墨烯纳米片(GNS)/CoS2复合材料,利用XRD和SEM对所制备复合材料的微观结构进行表征,采用循环伏安法和交流阻抗法对复合材料的电化学性能进行研究。研究结果表明,在水热过程中,氧化石墨(GO)逐渐被还原成石墨烯纳米片(GNS),能够为CoS2晶核的形成提供更多的接触点,有利于CoS2颗粒均匀地生长在GNS表面。这种结构的复合材料既能够显著增加CoS2和电解液之间的有效接触面积,提高CoS2的电化学利用率,同时又能够改善材料的导电性,有利于提高材料的比电容。
The graphene nanosheet （GNS） /COS2 composite was prepared by the one-step hydrothermal method. The crystal structure and morphology were characterized by XRD and SEM. Electrochemical properties were determined by cyclic voltammetry and electrochemical impedance spectroscopy. Graphite oxide （GO） was gradually reduced to form graphene nanasheet during the hydrothermal process, which could provide abundant contact sites for the formation of CoS2 crystal nucleus, thus leading to uniform distribution of CoS2 particles on the surface of graphene. Such novel structure composite not only significantly enhanced the effective contact area between CoS2 and electrolyte, but also improved electrochemical utilization of CoS2 electrode materials. Meanwhile, it facilitated electrical conductivity of the material, resulting in increased specific capacitance.
出处
《化工学报》
EI
CAS
CSCD
北大核心
2014年第7期2849-2854,共6页
CIESC Journal
基金
国家自然科学基金项目(21003028)~~
