CAJ | 학술논문

利用未经任何分散处理的氧化石墨溶胶在气-液界面自组装得到氧化石墨纸(φ=10 cm),将氧化石墨纸在不同温度下用水合肼蒸气还原制得石墨烯纸.采用扫描电子显微镜( SEM)、X射线衍射( XRD)、 Raman光谱、X射线光电子能谱( XPS)及氮吸附对还原前后样品的微观结构、表面特性、元素组成及比表面积进行了表征,在此基础上考察了还原处理及还原温度对材料电容特性的影响.结果表明,在150℃下还原氧化石墨纸得到的石墨烯纸具有较好的电化学电容特性,其在1000 mA/g恒定充放电电流密度下,6 mol/L KOH电解质溶液中的质量比电容达到142 F/g,1000次充放电循环后电容保持率为99.8%.
이용미경임하분산처리적양화석묵용효재기-액계면자조장득도양화석묵지(φ=10 cm),장양화석묵지재불동온도하용수합정증기환원제득석묵희지.채용소묘전자현미경( SEM)、X사선연사( XRD)、 Raman광보、X사선광전자능보( XPS)급담흡부대환원전후양품적미관결구、표면특성、원소조성급비표면적진행료표정,재차기출상고찰료환원처리급환원온도대재료전용특성적영향.결과표명,재150℃하환원양화석묵지득도적석묵희지구유교호적전화학전용특성,기재1000 mA/g항정충방전전류밀도하,6 mol/L KOH전해질용액중적질량비전용체도142 F/g,1000차충방전순배후전용보지솔위99.8%.
Large-scale (φ=10 cm ) graphene paper ( GP ) was prepared by the reduction of graphite oxide paper( GOP) self-assembled at the liquid/air interface with hydrazine hydrate vapor. The morphology, struc-ture, components and BET surface area of GOP and GP were characterized by scanning electron microscopy ( SEM ) , X-ray diffraction ( XRD ) , Raman spectroscopy, X-ray photoelectron spectroscopy ( XPS ) and nitrogen adsorption-desorption analysis. Furthermore, influence of reduction and reduction temperature on the super-capacitive properties was investigated. It is found that the graphene paper fabricated at 150 ℃ exhibits high capacitive behavior and long charge/discharge cycle life at a current density of 1000 mA/g. The discharge capacitance of the material in an aqueous electrolyte of 6 mol/L KOH is 142 F/g and the capaci-tance retention is 99. 8% after 1000 charge/discharge cycles.