Synthesis and Capacitive Properties of Manganese Oxide Nanosheets Dispersed on Functionalized Graphene Sheets
Synthesis and Capacitive Properties of Manganese Oxide Nanosheets Dispersed on Functionalized Graphene Sheets
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DOI：
10.1021/jp200724h
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发表时间：
2011-03
影响因子：
3.7
通讯作者：
Jintao Zhang;Jianwen Jiang;X. Zhao
中科院分区：
文献类型：
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作者：
Jintao Zhang;Jianwen Jiang;X. Zhao
通过用聚（二烯丙基二甲基氯化铵）（PDDA）还原功能化氧化石墨烯，将还原的氧化石墨烯（RGO）的表面电荷从负极转移到正极来制备功能化石墨烯。通过静电共沉淀法将带负电荷的MnO2纳米片分散在功能化RGO片材上，可得到功能化RGO与二氧化锰（MnO2）纳米片的复合材料。通过高分辨率透射电子显微镜（HRTEM）研究了复合材料的结构，结果表明MnO2纳米片分散在功能化的RGO片上，呈现出层状结构。由于两种组分的协同效应，该复合材料表现出比纯功能化 RGO 和钠型水钠锰矿 (Na/MnO2) 片增强的电容性能。此外，1000次循环后仍保留超过89%的原始电容，表明复合材料具有良好的循环稳定性。
Functionalized graphene was prepared by reducing functionalized graphene oxide with poly(diallyldimethylammonium chloride) (PDDA), transferring the surface charge of reduced graphene oxide (RGO) from negative to positive. A composite material of functionalized RGO with manganese dioxide (MnO2) nanosheets can be obtained by dispersing negatively charged MnO2 nanosheets on the functionalized RGO sheets via an electrostatic coprecipitation method. The structures of composites were investigated by high-resolution transmission electron microscopy (HRTEM), which indicated that the MnO2 nanosheets dispersed on functionalized RGO sheets, exhibiting a layered structure. The composite material exhibited enhanced capacitive performances than those of pure functionalized RGO and Na-typed birnessite (Na/MnO2) sheets, attributing to the synergic effect of both components. Additionally, over 89% of original capacitance was retained after 1000 cycles, indicating a good cycle stability of the composite materials.