热处理后GO/MnO2电极材料微观结构对电容增效的影响
Promotion Effect of GO/MnO2 Microstructure after Heat Treatment on the Capacitance of the Composite Material
不同温度下热处理氧化石墨烯(graphene oxide, GO), 并按20wt%含量将其与MnO2复合, 制得GO/MnO2复合材料。 采用扫描电镜(SEM), X射线衍射(XRD)及傅里叶红外(FT-IR)表征分析了复合材料的表面形貌与结构, 四探针测试了其电导率, 并通过循环伏安测试计算得到了复合材料的比电容。 结果表明, 600 ℃热处理后的GO与MnO2复合得到的材料比电容最高, 为321 Fog-1, 相较于纯相MnO2提高了87%。热处理GO在改善其导电性的同时, 残留的含氧官能团还提供了赝电容, 使GO和MnO2形成了协同效应。
Graphene Oxide (GO) was heated in different temperatures, and mixed with MnO2 in 20wt% to form GO/MnO2 composite materials. The morphology and structure of the materials were characterized by scanning electron microscopy (SEM), X ray diffraction spectrometry (XRD) and Fourier Transform Infrared Spectrometer (FT-IR). The electrical conductivity was tested with a four-probe method. Meanwhile, the specific capacitance was calculated from the curve of the Cyclic Voltammetry. Results show that the GO/MnO2 composite materials with 600 ℃ reduced GO as a component have the highest specific capacitance of 321 Fog-1, which is 87% promoted compared with the pure MnO2. As the electrical conductivity is improved after the heat treatment, the left oxygen-containing functional groups still provide faradaic pseudocapacitance, making it good synergetic effect between GO and MnO2.
王晓敏、王勇、王令云
材料科学电化学工业
氧化石墨烯/MnO2复合材料比电容热处理官能团
GO/MnO2 composite materialSpecific capacitanceHeat treatmentFunctional groups
王晓敏,王勇,王令云.热处理后GO/MnO2电极材料微观结构对电容增效的影响[EB/OL].(2014-02-05)[2025-08-03].http://www.paper.edu.cn/releasepaper/content/201402-70.点此复制
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