铝掺杂二氧化锰纳米线的制备及其电化学性能
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摘要
采用水热法以KMnO_4和MnSO_4为原料,Al(NO_3)_3为铝源,制备出了Al掺杂的二氧化锰纳米线。通过扫描电子显微镜(SEM)和X线衍射仪(XRD)分别对样品的形貌和结构进行表征,并使用循环伏安法(CV)、恒流充放电等方法研究了样品的电化学性能。结果表明,当添加适量Al(NO_3)_3制备出直径约?10nm、长约80nm的纳米球线。当Al(NO_3)_3的摩尔比为1mmol,电流密度为2mA/cm~2时,面电容为1 127mF/cm~2,比相同条件下纯二氧化锰容量高65%,表现出良好的电化学性能。
The Al-doped manganese dioxide nanowire has been prepared with the hydrothermal method by using KMnO_4 and MnSO_4 as raw materials.The structure and morphology of samples are characterized through scanning electron microscope(SEM)and X-ray diffraction(XRD)respectively.Besides,the electrochemical performance of the sample is studied with the cyclic voltammetry(CV)and constant current charge and discharge methods.The results show that the nanosphere wires with a diameter of about ?10nm and a length of 80 nm are prepared when appropriate amount of Al(NO_3)_3 is added.When 1mmol of Al(NO_3)_3 is added,the capacitance is 1 127mF/cm~2 under 2mA/cm~2 of current density,which is 65% higher than that of pure manganese dioxide under the same conditions,showing good electrochemical performance.
The Al-doped manganese dioxide nanowire has been prepared with the hydrothermal method by using KMnO_4 and MnSO_4 as raw materials.The structure and morphology of samples are characterized through scanning electron microscope(SEM)and X-ray diffraction(XRD)respectively.Besides,the electrochemical performance of the sample is studied with the cyclic voltammetry(CV)and constant current charge and discharge methods.The results show that the nanosphere wires with a diameter of about ?10nm and a length of 80 nm are prepared when appropriate amount of Al(NO_3)_3 is added.When 1mmol of Al(NO_3)_3 is added,the capacitance is 1 127mF/cm~2 under 2mA/cm~2 of current density,which is 65% higher than that of pure manganese dioxide under the same conditions,showing good electrochemical performance.
引文
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[3]WANG Y T,LU A H,ZHANG H L,et al.Synthesis of nanostruc-tured mesoporous manganese oxides with three-dimensional frame-works and their application in supercapacitors[J].J Phys Chem C,2011,115(54):13-21.
[4]DINH T M,ACHOUR A,VIZIREANU S,et al.Hydrous RuO2/carbon nano-walls hierarchical structures for all-solid-stateultra high-energy-density micro-supercapacitors[J].Nano Energy,2014,10:288-294.
[5]WEI W,CUI X,CHEN W,et al.Manganese oxidebased materials as electrochemical supercapacitor electrodes[J].Chem Soc Rev,2011,40(3):1697-1721.
[6]NAKAYAMA M,KANAYA T,INOUE R.Anodic deposition of layered manganese oxide into a colloidal crystal template for electrochemical supercapacitor[J].Electrochem Commun,2007,9(5):1154-1158.
[7]LI Y,XIE H Q,WANG J F,et al.Preparation and electrochemical performances ofα-MnO2 nanorod for supercapacitor[J].Material Letters,2011,65(2):403-405.
[8]冯杨柳,张密林,陈野,等.掺Cr改性MnO2的制备及其电化学性[J].中国有色金属学报,2005(2):316-320.FENG Yangliu,ZHANG Milin,CHEN Ye,et al.Preparation and electrochemical performance of Cr-doped MnO2 modified[J].China Nonferrous Metals Society,2005(2):2316-2320.
[9]万传云,王利军,沈绍典,等.合成路径对超级电容器用二氧化锰性质的影响[J].化学学报,2009,67(14):1559-1565.WAN Chuanyun,WANG Lijun,SHEN Shaodian,et al.Effect of synthetic routes on the properties of manganese dioxide for supercapacitors[J].Chinese Journal of Chemistry,2009,(14):1559-1565.
[10]MACHEFAUX E,VERBAERE A,GUYOMARD D.Preparation of nanowires of M substituted manganese dioxides(M=Al,Co,Ni)by the electrochemical hydrothermal method[J].Journal of Physics and Chemistry of Solids,2013,67(5/6):1315-1319.
[11]CALVERT C,JOESTEN R,NGALA K,et al.Synthesis,characterization,and rietveld refinement of tungsten-framework-doped porous manganese oxide(K-OMS-2)material[J].Chemistry of Materials,2008,20(20):6382-6388.
[12]CHUNG K Y,RYU C W,KIM K B.Onset mechanism of Jahn-Teller distortion in 4V LiMn2O4and its suppression by Li M0.05Mn1.95O4(M=Co,Ni)coating[J].Journal of the Electrochemical Society,2005,152(4):791-795.
[13]ZHU K,WANG Y,TANG J A,et al.In situ growth of MnO2nanosheets on activated carbon fibers:a low-cost electrode for high performance supercapacitors[J].RSC Adv,2016,6(18):14819-14825.
[14]ZHANG J,ZHANG J H,ZHANG C B,et al.Complete catalytic oxidation of ethanol over MnO2 with different crystal phase structures[J].Acta Phys Chim Sin,2015,31(2):353-359.