CAJ | 학술논문

水热条件下在炭微球(CMS)载体表面原位生长纳米结构的二氧化锰(MnO2),制备碳微球/二氧化锰(CMS/MnO2)纳米复合电极材料,并应用于超级电容器。采用扫描电镜(SEM)、X 射线衍射(XRD)和热重分析(TGA)对复合材料结构进行表征；采用循环伏安法、恒流充放电和交流阻抗对其电化学性能进行研究。结果表明,CMS/MnO2复合物中 MnO2纳米片均匀地负载在碳微球的表面,形成绣球状结构,Mn O 2纳米片具有典型的 K-Birnessite 型晶体结构,其中MnO2的含量约为62％(质量分数),CMS/MnO2比容量达到266 F/g；随着反应时间的延长,碳微球表面负载的 MnO2纳米片逐渐生长并完善,CMS/MnO2的比容量也呈现先增长后保持不变的趋势。
수열조건하재탄미구(CMS)재체표면원위생장납미결구적이양화맹(MnO2),제비탄미구/이양화맹(CMS/MnO2)납미복합전겁재료,병응용우초급전용기。채용소묘전경(SEM)、X 사선연사(XRD)화열중분석(TGA)대복합재료결구진행표정；채용순배복안법、항류충방전화교류조항대기전화학성능진행연구。결과표명,CMS/MnO2복합물중 MnO2납미편균균지부재재탄미구적표면,형성수구상결구,Mn O 2납미편구유전형적 K-Birnessite 형정체결구,기중MnO2적함량약위62％(질량분수),CMS/MnO2비용량체도266 F/g；수착반응시간적연장,탄미구표면부재적 MnO2납미편축점생장병완선,CMS/MnO2적비용량야정현선증장후보지불변적추세。
This article reported the electrochemical performance of a microspheres carbon/MnO2 (CMS/MnO2 ) composite prepared by an in-situ self-limiting deposition method under hydrothermal condition.The morpholo-gies and structures of the prepared materials were characterized by scan electron microscopy (SEM),transmis-sion electron microscopy (TEM),X-ray diffraction (XRD)and thermo gravimetric analysis (TGA),and the electrochemical behaviors were tested by means of cyclic voltammetry (CV),charge-discharge tests and electro-chemical impedance spectroscopy (EIS),respectively.The results reveal that MnO2 homogeneously grow onto the surface of CMS to form a hydrangea-like microstructure.MnO2 has a typical K-Birnessite-type crystal struc-ture and the content of MnO2 in the composite is 62 wt% and a specific capacitance of 266 F/g was obtained. Upon the prolonged synthetic time,the specific capacitance of resultant CMS/MnO2 materials increased and then levels off,because MnO2 nanosheets coated and grown on the surface of CMS step by step.