SnO2/石墨分级纳米异质结构的合成及其电化学性能研究

以石墨为基底,五水合四氯化锡为锡源,氢氧化钠为沉淀剂,采用一步水热法合成了SnO2/石墨分级纳米异质结构.利用FESEM、XRD、EDS、Raman等对SnO2/石墨分级纳米异质结构进行了形貌、结构和成分表征.研究发现,结晶良好的SnO2纳米线首先组装成SnO2纳米棒,纳米棒进一步组装成直径约450 nm的花状结构,并...

Synthesis and Electrochemical Performance of SnO2/Graphite Hierarchical Nano-Heterostructure

SnO₂/graphite hierarchical nano-heterostructure was synthesized by a one-step hydrothermal method using graphite as the substrate, tin tetrachloride pentahydrate as the tin source, and sodium hydroxide as the precipitant. The morphology, structure and composition of the SnO₂/graphite hierarchical nano-heterostructure were characterized by FESEM, XRD, EDS and Raman. It is found that tin dioxide nanowires with good crystallinity are firstly assembled into tin dioxide nanorods, then the tin dioxide nanorods are further assembled into flower-like structures with a diameter of 450 nm and grow uniformly on the graphite sheet, showing a hierarchical structure. The electrochemical performance of those hierarchical nano-heterostructure was tested by cyclic voltammetry and constant current charge-discharge cycle method. The results show that the initial discharge capacity and charge capacity are 1 567.2 mAh/g and 825.9 mAh/g respectively at a charge-discharge current density of 50 mA/g. The cyclic voltammetry curves of different cycles are almost the same, indicating that the SnO₂/graphite hierarchical nano-heterostructure has high storage capacity and improved cycle stability.