二氧化锰/石墨烯复合电极材料的合成及超电容性能研究
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摘要
将氧化石墨(GO)还原为石墨烯(GNS),以高锰酸钾(KMnO_4)和硫酸锰(MnSO_4)为锰源,在石墨烯基体上合成二氧化锰/石墨烯(MnO_2/GNS)复合电极材料。采用扫描电子显微镜(SEM)、X射线衍射(XRD)对材料的微观形貌和晶体结构进行表征;将电极材料制备成复合电极片并组装成对称型超级电容器,采用恒流充放电对其进行电化学性能测试。结果表明,复合电极材料在5A·g~(-1)的电流条件下,比容量达到291.5 F·g~(-1),在循环200次后电容保持率达到95.6%,具有良好的电化学性能。
Graphene(GNS) was synthesized by reduction method with graphite oxide(GO). Manganese dioxide/graphene composite electrode materials was synthesized on graphene substrate with KMnO_4 and MnSO_4 as material. The morphologies and crystal structures of the materials were characterized by scanning electron microscopy(SEM) and X-ray diffraction(XRD). The electrode material was prepared into composite electrode and assembled into symmetrical supercapacitor. The electrochemical performance was tested by constant current charging and discharging. The results showed that the specific capacitance of composite electrode material reached 291.5 F/g under the current of 5 A/g, and the capacitance retention rate reaches 95.6% after 200 cycles, and had good electrochemical performance.
Graphene(GNS) was synthesized by reduction method with graphite oxide(GO). Manganese dioxide/graphene composite electrode materials was synthesized on graphene substrate with KMnO_4 and MnSO_4 as material. The morphologies and crystal structures of the materials were characterized by scanning electron microscopy(SEM) and X-ray diffraction(XRD). The electrode material was prepared into composite electrode and assembled into symmetrical supercapacitor. The electrochemical performance was tested by constant current charging and discharging. The results showed that the specific capacitance of composite electrode material reached 291.5 F/g under the current of 5 A/g, and the capacitance retention rate reaches 95.6% after 200 cycles, and had good electrochemical performance.
引文
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[2]赵纯,等.石墨烯基复合材料的制备及其在超级电容器中的应用[J].化学世界,2014,55(9):569-573.
[3]王福华,等.活性炭/二氧化锰纳米复合材料的合成及超电容性能[J].应用化工,2015,44(5):785-793.
[4]宋海明,等.原位水热合成CMS/Mn O2纳米复合材料及其电化学性能研究[J].功能材料,2015,46(2):2124-2129.