CAJ | 학술논문

以石墨为原料,采用改进的Hummers方法制备氧化石墨,在水中经超声分散得到氧化石墨烯水溶胶,经硼氢化钠还原得到石墨烯聚集物.采用扫描电镜、原子力显微镜、激光粒度分析仪、BET氮气吸附仪对样品的形态、粒度分布和比表面积进行了表征.采用恒流充放电和循环伏安法研究了样品的充放电性能.结果表明,氧化石墨在水溶液中可以剥离成单片层结构,石墨烯聚集物比表面积为358 m~2/g,在10 mA恒流下充放电,比电容为138.6 F/g,充放电容量效率为98%.以5～50 mV/s扫描速率进行循环伏安测试,石墨烯电极表现出良好的双电层电容器性能.
이석묵위원료,채용개진적Hummers방법제비양화석묵,재수중경초성분산득도양화석묵희수용효,경붕경화납환원득도석묵희취집물.채용소묘전경、원자력현미경、격광립도분석의、BET담기흡부의대양품적형태、립도분포화비표면적진행료표정.채용항류충방전화순배복안법연구료양품적충방전성능.결과표명,양화석묵재수용액중가이박리성단편층결구,석묵희취집물비표면적위358 m~2/g,재10 mA항류하충방전,비전용위138.6 F/g,충방전용량효솔위98%.이5～50 mV/s소묘속솔진행순배복안측시,석묵희전겁표현출량호적쌍전층전용기성능.
Graphite was oxidized with modified Hummers's method and made into aqueous colloid with supersonic,in which the oxidized graphite were exfoliated into oxidized graphene layers. The graphene was gotten by reducing the graphene layers with sodium borohydride. The samples were characterized by scanning electron microscope, atomic force microscope, laser paricle analyzer and BET surface analyzer, while the charge-discharge performance was investigated by constant current and cyclic voltammetry methods. The results show that the oxidized graphene can be dispersed in aqueous solution in single sheets. The surface area of graphene is 358 m~2/g, and its charge capacitance at 10 mA is 138.6 Fig and the capacitance efficiency is 98%. The cyclic voltammetry test shows the graphene has good double layer electrical performance at scanning rates of 5-50 mV/s.