CAJ | 학술논문

在不同的反应时间下水热法控制制备发射状超级电容器用Mn O 2电极材料,采用 X射线衍射光谱(XRD)、扫描电镜(SEM)表征其结构,采用循环伏安、恒流充放电和交流阻抗研究其电化学电容性能。结果表明,制备的Mn O 2为隐钾锰矿型,具有发射状结构,随着反应时间的延长,Mn O 2的晶型从不完善逐渐变得完善,发射状结构逐渐明显、增大,并且 Mn O 2辐射出的每根单枝从较细的纳米刺逐渐生长为四方结构的纳米棒；在5 mA/cm2的电流密度下,最高比电容达到了448F/g；随着反应时间的增加,MnO2电极的比容量先增长再降低。
재불동적반응시간하수열법공제제비발사상초급전용기용Mn O 2전겁재료,채용 X사선연사광보(XRD)、소묘전경(SEM)표정기결구,채용순배복안、항류충방전화교류조항연구기전화학전용성능。결과표명,제비적Mn O 2위은갑맹광형,구유발사상결구,수착반응시간적연장,Mn O 2적정형종불완선축점변득완선,발사상결구축점명현、증대,병차 Mn O 2복사출적매근단지종교세적납미자축점생장위사방결구적납미봉；재5 mA/cm2적전류밀도하,최고비전용체도료448F/g；수착반응시간적증가,MnO2전겁적비용량선증장재강저。
Emission-like manganese dioxide was controlled synthesized by using the hydrothermal method in the different reaction time for supercapacitor electrode.The structures were characterized by XRD and SEM,and the supercapacitive behaviors were investigated by cyclic voltammetry (CV),charge-discharge tests,and ac im-pedance spectroscopy,respectively.The results suggested that the as-prepared manganese dioxides indexed tet-ragonal cryptomelane phase and the morphology of which was emission-like nanoclusters.Crystallinity and structure dimension became larger and the nanostab structure of every single branch was changed into nanorod structure followed with the time.The specific capacitance values of manganese dioxide electrode was 448F/g corresponding to the charge/discharge current densities of 5 mA/cm2 .With the prolonging of reaction time,the specific capacitance tended to raise first and then declined.