MnO_2-纳米碳球/活性炭混合电化学电容器单体的制备及其电容特性研究
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摘要
通过液相沉淀法制备了MnO~2-纳米碳球(MnO~2-NCs)复合粉末用作正极活性物质,与活性炭(AC)负极组成混合电化学电容器。利用电化学测试研究了正负极配比、工作电压宽度和充放电电流密度对电容器单体电容特性的影响。结果表明:以0.5mol/LNa_2SO_4水溶液为电解液的MnO~2-NCs/AC混合电容器单体的工作电压能够达到1.6～1.8V;当正负极配比为1.5时整体表现出最佳电容性能;单体以50mA恒流放电时的比容量相对10mA时保持率为68%～82%。
MnO~2-NCs(nano-carbon sphere)composite powder was prepared by liquid-phase precipitation method,then mixed eletrochemical capacitors incorporating the composite powder as the positive electrode active material and AC(activated carbon)as the negative electrode was fabricated.The effects of ratio of anode and cathode materials,operating voltage width and current density on the capacitance characteristics of monomer were studied by electrochemical test.Experiment results showed that the operating voltage of MnO~2-NCs/AC can reach 1.6～1.8 V with 0.5 mol/L Na_2SO_4 as the electrolyte.When the ratio of positive and negative was 1.5,the monomer exhibited the best specific capacitance.And when galvanostatic charge-discharge at 50 mA,the specific capacitance of monomer maintained 68%～82%in comparison with that at 10 mA.
MnO~2-NCs(nano-carbon sphere)composite powder was prepared by liquid-phase precipitation method,then mixed eletrochemical capacitors incorporating the composite powder as the positive electrode active material and AC(activated carbon)as the negative electrode was fabricated.The effects of ratio of anode and cathode materials,operating voltage width and current density on the capacitance characteristics of monomer were studied by electrochemical test.Experiment results showed that the operating voltage of MnO~2-NCs/AC can reach 1.6～1.8 V with 0.5 mol/L Na_2SO_4 as the electrolyte.When the ratio of positive and negative was 1.5,the monomer exhibited the best specific capacitance.And when galvanostatic charge-discharge at 50 mA,the specific capacitance of monomer maintained 68%～82%in comparison with that at 10 mA.
引文
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[3]金莉,孙东,张剑荣.石墨烯/聚3,4-乙烯二氧噻吩复合物的电化学制备及其在超级电容器中的应用[J].无机化学学报,2012,28(6):1084-1090.
[4]赵雪,邱平达,姜海静,等.超级电容器电极材料研究最新进展[J].电子元件与材料,2015,34(1):1-8.
[5]金晓晓,钟莲,万起展,等.聚苯胺/改性石墨电极的制备及电容性能研究[J].化工新型材料,2017,45(6):103-106.
[6]马延文,熊传银,黄雯,等.碳化法国梧桐絮制备碳微米管及作为超级电容器电极的研究[J].无机化学学报,2012,28(3):546-550.
[7]于艳艳,关云锋,丛野,等.碳化硅衍生碳的制备及其超级电容性能[J].无机化学学报,2017,33(5):853-859.
[8] Chen P C,Shen G Z,Shi Y,et al.Preparation and characterization of flexible asymmetric supercapacitors based on transition-metal-oxide nanowire/single-walled carbon nanotube hybrid thin-film electrodes[J].ACS Nano,2010,4(8):4403-4411.
[9]苏岳锋,吴锋.新型非对称电化学电容器的电极匹配研究[J].电化学,2004,10(2):190-196.
[10]吴明霞,曹小卫,安仲勋,等.LiNi1/3Co1/3Mn1/3O2/AC混合超级电容器正负极容量配比研究[J].电子元件与材料,2011,30(1):34-37.
[11]孙刚伟.炭基超级电容器正负极不对称电容行为研究[D].上海:华东理工大学,2012.
[12]申来法.混合型超级电容器关键材料的设计及器件构造[D].南京:南京航空航天大学,2014.
[13]张宣宣,冉奋,范会利,等.互通多孔碳/二氧化锰纳米复合材料的原位水热合成及电化学性能[J].物理化学学报,2014,30(5):881-890.
[14]刘桂静.基于(氧化)石墨烯/聚吡咯复合材料的非对称电容器[D].泉州:华侨大学,2014.
[15]王建淦.纳米二氧化锰基复合材料的制备及其电化学特性研究[D].北京:清华大学,2013.
[16]王永芳,左宋林.含磷活性炭作为双电层电容器电极材料的电化学性能[J].物理化学学报,2016,32(2):481-492.