Facile solvothermal synthesis of a graphene nanosheet–bismuth oxide composite and its electrochemical characteristics
Facile solvothermal synthesis of a graphene nanosheet–bismuth oxide composite and its electrochemical characteristics
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DOI：
10.1016/j.electacta.2010.08.048
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发表时间：
2010-12
影响因子：
6.6
通讯作者：
Huanwen Wang;Zhongai Hu;Yan-Qin Chang;Yan-Li Chen;Z. Lei;Ziyu Zhang;Yuying Yang
中科院分区：
文献类型：
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作者：
Huanwen Wang;Zhongai Hu;Yan-Qin Chang;Yan-Li Chen;Z. Lei;Ziyu Zhang;Yuying Yang
该工作展示了一种用于制备包含金属氧化物纳米颗粒和石墨烯的石墨烯基复合材料的新颖且简便的路线。将带负电荷的氧化石墨烯片分散在铋阳离子的N，N-二甲基甲酰胺（DMF）溶液中，在180°C下同时溶剂热还原得到石墨烯-铋复合物，经热处理，首次合成了石墨烯纳米片-氧化铋复合超级电容器电极材料。采用X射线粉末衍射（XRD）、红外光谱（FT-IR）、场发射扫描电镜（FESEM）、透射电镜（TEM）、热重和差热分析（TG-DTG）等方法对复合材料的形貌、组成和微观结构进行了表征。采用循环伏安法（CV）、恒流充放电和电化学阻抗谱（EIS）等测试手段研究了其电化学行为。在1 Ag − 1的比电流下获得255 Fg −1的比电容（基于复合材料），而纯石墨烯的比电容为71 Fg − 1。即使在10Ag−1下，负载的氧化铋也达到高达757 Fg − 1的比电容。此外，石墨烯纳米片-氧化铋复合电极还表现出优异的倍率性能和良好的可逆性。
This work demonstrates a novel and facile route for preparing graphene-based composites comprising of metal oxide nanoparticles and graphene. A graphene nanosheet–bismuth oxide composite as electrode materials of supercapacitors was firstly synthesized by thermally treating the graphene–bismuth composite, which was obtained through simultaneous solvothermal reduction of the colloidal dispersions of negatively charged graphene oxide sheets in N,N-dimethyl formamide (DMF) solution of bismuth cations at 180°C. The morphology, composition, and microstructure of the composites together with pure graphite oxide, and graphene were characterized using powder X-ray diffraction (XRD), FT-IR, field emission scanning electron microscopy (FESEM), transmission electron microscope (TEM), thermogravimetry and differential thermogravimetry (TG–DTG). The electrochemical behaviors were measured by cyclic voltammogram (CV), galvanostatic charge–discharge and electrochemical impedance spectroscopy (EIS). The specific capacitance of 255Fg−1(based on composite) is obtained at a specific current of 1Ag−1as compared with 71Fg−1for pure graphene. The loaded-bismuth oxide achieves a specific capacitance as high as 757Fg−1even at 10Ag−1. In addition, the graphene nanosheet–bismuth oxide composite electrode exhibits the excellent rate capability and well reversibility.