石墨烯/二氧化锰复合材料的制备及其电化学性能 |
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作者姓名: | 周龙斐 邱红梅 徐美 路彦珍 胡建玲 王子娅 王凤平 |
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作者单位: | 北京科技大学数理学院,北京,100083;北京科技大学数理学院,北京,100083;北京科技大学数理学院,北京,100083;北京科技大学数理学院,北京,100083;北京科技大学数理学院,北京,100083;北京科技大学数理学院,北京,100083;北京科技大学数理学院,北京,100083 |
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基金项目: | 中央高校基础科研基金资助项目(FRF-AS-13-004A北京高等学校青年英才计划资助项目(YETP0390)FRF-BR-14-024A)北京科技大学基本科研业务费资助项目(FRF-BR-14-024A) |
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摘 要: | 通过水热法在160℃条件下成功制备了手风琴状石墨烯/MnO2复合材料.通过场发射扫描电镜、透射电镜、X射线衍射、X射线能量色散谱、BET法以及拉曼光谱对材料进行表征.结果表明,手风琴状二氧化锰与层状石墨烯之间具有十分高效的贴合,这种创新性设计有效地利用了石墨烯的高电导率、大比表面积以及二氧化锰的优秀赝电容行为.电化学测试结果给出在0.2 A·g-1时,样品的比电容高达138 F·g-1,数倍增强于单独的二氧化锰或石墨烯样品.
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关 键 词: | 二氧化锰 石墨烯 水热合成 超级电容器 |
收稿时间: | 2015-11-04 |
Synthesis and electrochemical properties of graphene/MnO2 composites |
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Affiliation: | School of Mathematics and Physics, University of Science and Technology Beijing, Beijing 100083, China |
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Abstract: | Accordion-like MnO2-coated graphene composites were successfully prepared by a facile hydrothermal method at 160℃. The as-products were characterized by field emission scanning electron microscopy, transmission electron microscopy, X-ray dif-fraction, energy dispersive spectrometry, BET and Raman spectroscopy. The high capacitance of 138 F·g-1 at 0.2 A·g-1 is achieved with MnO2/graphene composites as a supercapacitor electrode, much higher than that of a single MnO2 or graphene electrode. The ex-cellent electrochemical performance is attributed to the uniform MnO2 nanosheet morphology, large surface area of graphene and stable chemical bonding of MnO2 on the graphene substrate. |
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