石墨烯复合材料.pdf

物理化学学报( Wuli Huaxue Xuebao)
1876
Acta Phys.-Chim.Sin.2014,30(10),1876-1882
October
Article
doi:10.3866/PKU.WHXB201407172
www.whxb.pku.edu.cn
无模板剂合成用于超级电容器的二氧化锰/石墨烯复合材料
唐佳勇1曹佩琪付延鲍2李鹏辉马晓华
(复旦大学材料科学系,上海200433 Environmental and Energy Technologies Division, Lawrence Berkeley National
Laboratory, University of California, Berkeley, CA 94720, USA)
摘要:以尿素、四水合氯化锰和氧化石墨烯为原料,采用水热法并通过热分解制备了一种具有石墨烯包覆结
构的石墨烯-二氧化锰复合材料,利用扫描电子显微镜、X射线行射、比表面积(BET)、拉曼光谱和热失重等技术
对其形貌、晶体结构及表面结构进行了表征;在三电极条件下利用循环伏安法、恒流充放电法和交流阻抗法测
试了材料的电化学性能,并考察了不同石墨烯含量对材料比电容的影响.结果表明,在不添加模板剂的条件下
制备的复合材料中二氧化锰是具有介孔结构的a-MnO2,当复合15%(质量分数)的石墨烯后材料的比表面积从
109m2'g'提高到168m2·g复合材料具有更好的电化学性能,在0.2A·g'电流密度下复合材料的比电容达
到最大值(454F·g-),远高于纯二氧化锰的值(294F“g)在2A?g~'的电流密度下恒流充放电2000次后复合
材料的比电容保持率为92%
关键词:二氧化锰;石墨烯;复合材料;超级电容器;水热法;能量储存
中图分类号:O646;TB333
Synthesis of a Mesoporous Manganese Dioxide-graphene Composite
by a Simple Template-free Strategy for High-performance
Supercapacitors
TANG Jia-yong CAO Pei-qi FU Yan-bao LI Peng-hui MA Xiao-hua
(Department of Materials Science, Fudan University, P R Shanghai 200433, P R China; Environmental and Energy
Technologies Division, Lawrence Berkeley National Laboratory, University of Califomia, Berkeley, CA 94720, USA)
Abstract: A manganese dioxide( Mn ) -graphene composite material with a unique structure consisting of
Mno surrounded by graphene sheets was prepared by a simple hydrothermal and thermal decomposition
method. The morphology and structure of the obtained materials were examined by scanning electron
microsoy transition elec on microscop Raman spectroscop X- ay fraction, and N adsoption-esorption
Electrochemical properties were evaluated by cyclic voltammetry, galvanostatic charge-discharge and
electrochemical impedance spectroscopy. The specific surface area increased from 109 to 168 m. for the
composite containing 15%(graphene. The specific capacitance also increased from 294 to 454 F. at a
current density of 0.2 A g in an aqueous electrolyte supercapacitor. Moreover, after 2000 cycles of a
galvanostatic charge-discharge test, the hybrid electre still had ecellent cycle stability(92% retention rate
Key Words: Manganese oxide; Graphene; Composite Supercapacitor; Hydrothermal method
Energy storage
Received: May 6, 2014; Revised: July 15, 2014; Published on Web: July 17, 2014
orresponding author. Email: hma(Fudan.edu. cn; Tel: +86-21-55664024
The project was supported by the Ministry of Science and Technology of China(51201035)
国家科学技术部(51201035)资助项目
G Editorial officc of Acta Physico-chimica Sinica