One-step synthesis of graphene/SnO2 nanocomposites and its application in electrochemical supercapacitors
One-step synthesis of graphene/SnO2 nanocomposites and its application in electrochemical supercapacitors
复制标题
石墨烯/SnO2纳米复合材料的一步合成及其在电化学超级电容器中的应用
DOI：
10.1088/0957-4484/20/45/455602
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发表时间：
2009-11-11
期刊：
影响因子：
3.5
通讯作者：
Niu, Li
中科院分区：
文献类型：
--
作者：
Li, Fenghua;Song, Jiangfeng;Niu, Li
采用一步法在酸性溶液中制备导电石墨烯/SnO2纳米复合材料。在盐酸和尿素的存在下，用SnCl2将石墨氧化物还原成石墨烯片。还原过程伴随着SnO2纳米颗粒的生成。通过透射电镜、x射线光电子和拉曼光谱等手段对GS纳米复合材料的结构和组成进行了表征。此外，利用循环伏安图（cv）和电阻抗谱（EIS）研究了GS纳米复合材料的超级电容器特性。随着电压扫描速率的增加，GS纳米复合材料的比电容略有下降。GS纳米复合材料的EIS在低频时的相位角接近π/2，具有良好的电容性能。此外，GS纳米复合材料在纳米电子学、超级电容器、传感器、纳米复合材料、电池和气体存储等领域具有广阔的应用前景。
A one-step method was developed to fabricate conductive graphene/SnO2 (GS) nanocomposites in acidic solution. Graphite oxides were reduced by SnCl2 to graphene sheets in the presence of HCl and urea. The reducing process was accompanied by generation of SnO2 nanoparticles. The structure and composition of GS nanocomposites were confirmed by means of transmission electron microscopy, x-ray photoelectron and Raman spectroscopy. Moreover, the ultracapacitor characteristics of GS nanocomposites were studied by cyclic voltammograms (CVs) and electrical impedance spectroscopy (EIS). The CVs of GS nanocomposites are nearly rectangular in shape and the specific capacitance degrades slightly as the voltage scan rate is increased. The EIS of GS nanocomposites presents a phase angle close to π/2 at low frequency, indicating a good capacitive behavior. In addition, the GS nanocomposites could be promisingly applied in many fields such as nanoelectronics, ultracapacitors, sensors, nanocomposites, batteries and gas storage.