十二烷基苯磺酸钠对MnO_2电化学性能影响的研究
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摘要
在表面活性剂十二烷基苯磺酸钠(SDBS)存在下,采用液相共沉淀法制备了二氧化锰(MnO2)电极材料,研究了SDBS对其结构、形貌和电化学性能的影响。利用傅利叶变换红外光谱(FT-IR)、X射线衍射(XRD)、扫描电镜(SEM)对所制备MnO2结构和形貌进行了表征。在1mol/L Na2SO4溶液中,通过循环伏安法(CV)、恒电流充放电(CD)和交流阻抗法(EIS)测试了电极材料的电化学性能。结果表明,SDBS对MnO2的晶型无明显影响,但使其粒径尺寸减小,形貌发生变化。MnO2的比电容随SDBS浓度的增加先增大后减小,SDBS浓度为0.023mol/L时制得的MnO2比电容可达193F/g(电流密度为1A/g),而不加SDBS时制得的MnO2比电容为156F/g。
In this paper,manganese oxide(MnO2)nanostructures were synthesized by fluid co-precipitation method with surfactant sodium dodecylbenzenesulfonate(SDBS).The effect of SDBS on the structure,morphology and electrochemical performance of the as prepared MnO2 was studied.The structure and morphology of the products were characterized by Fourier transform infrared spectrum(FT-IR),X-ray diffraction(XRD)and scanning electron microscopy(SEM).The electrochemical properties of the as prepared MnO2 were investigated by cyclic voltammetry(CV),galvanostatic charge-discharge(CD)test and electrochemical impedance spectroscopy(EIS)in 1 mol/L Na2SO4 aqueous electrolyte.The results showed that SDBS had no significant influence on the crystal structure of the as prepared MnO2,but made the size of the as prepared MnO2 smaller.As the concentration of SDBS increased,the specific capacitance of the as-obtained MnO2 first increased and then decreased,and 0.023mol/L was found to be the optimum impact concentration of SDBS.The MnO2 synthesized under optimum concentration delived a high specific capacitance of 193F/g at the current density of1A/g,compared to the 156F/g of the MnO2 synthesized without surfactant.
In this paper,manganese oxide(MnO2)nanostructures were synthesized by fluid co-precipitation method with surfactant sodium dodecylbenzenesulfonate(SDBS).The effect of SDBS on the structure,morphology and electrochemical performance of the as prepared MnO2 was studied.The structure and morphology of the products were characterized by Fourier transform infrared spectrum(FT-IR),X-ray diffraction(XRD)and scanning electron microscopy(SEM).The electrochemical properties of the as prepared MnO2 were investigated by cyclic voltammetry(CV),galvanostatic charge-discharge(CD)test and electrochemical impedance spectroscopy(EIS)in 1 mol/L Na2SO4 aqueous electrolyte.The results showed that SDBS had no significant influence on the crystal structure of the as prepared MnO2,but made the size of the as prepared MnO2 smaller.As the concentration of SDBS increased,the specific capacitance of the as-obtained MnO2 first increased and then decreased,and 0.023mol/L was found to be the optimum impact concentration of SDBS.The MnO2 synthesized under optimum concentration delived a high specific capacitance of 193F/g at the current density of1A/g,compared to the 156F/g of the MnO2 synthesized without surfactant.
引文
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[15]Minakshi M,Singh P,Issa T B,et al.Lithium insertion into manganese dioxide electrode in MnO2/Zn aqueous battery partⅡ.comparison of the behavior of EMD and battery grade MnO2in Zn9MnO29aqueous LiOH electrolyte[J].Journal of Power Sources,2004,138:319-322.
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[17]Sen P,Deb A,Chowdhury A D,et al.Conducting polymer based manganese dioxide nanocomposite as supercapacitor[J].Electrochimica Acta,2013,108:265-273.
[18]Suhasini,Chitharanjan Hegde A.Effect of surfactant on high capacitance of galvanostatically deposited MnO2[J].Journal of Electroanalytical Chemistry,2012,676:35-39.
[19]Lu Q,Zhou Y K.Synthesis of mesoporous polythiophene/MnO2nanocomposite and its enhanced pseudocapacitive properties[J].Journal of Power Sources,2011,196(8):4088-4094.
[2]Wei Weifeng,Cui Xinwei,Chen Weixing,et al.Manganese oxide-based materials as electrochemical supercapacitor electrodes[J].Chemical Society Reviews,2011,40(3):1697-1721.
[3]Jiang Rongrong,Huang Tao,Liu Jiali,et al.A novel method to prepare nanostructured manganese dioxide and its electrochemical properties as a supercapacitor electrode[J].Electrochimica Acta,2009,54(11):3047-3052.
[4]Zhang Huaihao,Wang Yaqiong,Liu Changwei,et al.Influence of surfactant CTAB on the electrochemical performance of manganese dioxide used as supercapacitor electrode material[J].Journal of Alloys and Compounds,2012,517:1-8.
[5]Wu Cheping,Peng Jiahui.Synthesis and electrochemical characterizations of nanosized manganese dioxides[J].Journal of Functional Materials,2011,42(2):359-361.
[6]Zhang Xuanxuan,Ran Fen,Fan Huili,et al.Hydrothermal synthesis and electrochemical measurements of interconnected porous carbon/MnO2composites[J].Acta Physico Chimica Sinica,2014,30(5):881-890.
[7]Ragupathy P,Dae Hoon Park,Guy Campet,et al.Remarkable capacity retention of nanostructured manganese oxide upon cycling as an electrode material for supercapacitor[J].Journal of Physical Chemistry,C,2009,113(15):6303-6309.
[8]Song Jinmei,Zhang Yuxiu,Zhu Shuquan,et al.Application of surfactant in battery material[J].Modern Chemical Industry,2011,31(1):28-31.
[9]Ni Wenbin,Wang Dengchao,Huang Zhongjie,et al.Fabrication of nanocomposite electrode with MnO2nanoparticles distributed in polyaniline for electrochemical capacitors[J].Materials Chemistry and Physics,2010,124(2-3):1151-1154.
[10]Chen Youcun,Duan Zhongyu,Min Yulin,et al.Synthesis,characterization and catalytic property of manganese dioxide with different structures[J].Journal of Materials Science-Materials in Electronics,2011,22(8):1162-1167.
[11]Li Lili,Chu Ying,Liu Yang,et al.Synthesis and shape evolution of novel cuniform-like MnO2in aqueous solution[J].Materials Letters,2007,61(7):1609-1613.
[12]Mi Juan,Wang Yuting,Gao Pengcheng,et al.Effects of thermal treatment on the electrochemical behavior of manganese dioxide[J].Acta Physico-Chimica Sinica,2011,27(4):893-899.
[13]Zhang Yong,Li Guangyin,Gao Haili,et al.Preparation process optimization and properties of manganese dioxide micro/nano spheres and microrods[J].Journal of University of Science and Technology Beijing,2013,35(10):1353-1359.
[14]Apte S K,Naik S D,Sonawane R S,et al.Nanosize Mn3O4(Hausmannite)by microwave irradiation method[J].Materials Research Bulletin,2006,41:647-654.
[15]Minakshi M,Singh P,Issa T B,et al.Lithium insertion into manganese dioxide electrode in MnO2/Zn aqueous battery partⅡ.comparison of the behavior of EMD and battery grade MnO2in Zn9MnO29aqueous LiOH electrolyte[J].Journal of Power Sources,2004,138:319-322.
[16]Kozawa A.Manganese dioxide handbook[M].Chengdu:Sichuan Science and Technology Press,1994.138-312.
[17]Sen P,Deb A,Chowdhury A D,et al.Conducting polymer based manganese dioxide nanocomposite as supercapacitor[J].Electrochimica Acta,2013,108:265-273.
[18]Suhasini,Chitharanjan Hegde A.Effect of surfactant on high capacitance of galvanostatically deposited MnO2[J].Journal of Electroanalytical Chemistry,2012,676:35-39.
[19]Lu Q,Zhou Y K.Synthesis of mesoporous polythiophene/MnO2nanocomposite and its enhanced pseudocapacitive properties[J].Journal of Power Sources,2011,196(8):4088-4094.