Transactions of Nonferrous Metals Society of China The Chinese Journal of Nonferrous Metals

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中国有色金属学报

ZHONGGUO YOUSEJINSHU XUEBAO

第15卷    第2期    总第71期    2005年2月

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文章编号:1004-0609(2005)02-0316-05
掺Cr改性MnO2的制备及其电化学性能
冯杨柳, 张密林, 陈 野, 景晓燕, 韩 莹

(哈尔滨工程大学 化工学院, 哈尔滨 150001)

摘 要:  采用低温固相氧化还原反应法制备出掺Cr的纳米MnO2。 通过X射线衍射仪对其结构进行表征,结果表明:所得样品为α-MnO2γ-MnO2的混合晶相, 以纳米MnO2作为超级电容器的电极材料的单电极活性物质测得其比电容为95 F/g,掺入Cr的电极材料其比电容最大可达到163 F/g。循环伏安和恒流充放电测试结果表明, 化学掺杂的配比对MnO2电化学性能的影响较大。 当Mn与Cr的摩尔比为100∶1时, 材料具有较好的放电性能, 其放电容量可提高70%。 表明化学掺杂Cr有利于提高MnO2电极的电化学性能。 

 

关键字:  超级电容器; 掺铬二氧化锰; 改性; 固相反应

Preparation and electrochemical performance of Cr doped MnO2
FENG Yang-liu, ZHANG Mi-lin, CHEN Ye, JING Xiao-yan, HAN Ying

School of Chemical Engineering,
Harbin Engineering University, Harbin 150001, China

Abstract: Chromium doped Nano MnO2 were synthesized by low temperature solid-state reaction. The charactrization and performance of samples were studied by X-ray diffraction. The results show that the product is the mixture of α-MnO2 and γ-MnO2, the specific capacitances of pure MnO2 and chromium doped MnO2 are 95 F/g and 163 F/g. The results of the cyclic voltammograms and the constant current charge/discharge curves show that the ratio of chromium in samples has greater effect on the electrochemical capacity, the better discharge capacity can be obtained when the mole ratio of Mn to Cr is 100 and the discharge capacity of MnO2 electrodes is 70% higher.

 

Key words: supercapacitor; chromium doped manganese dioxide; modification; solid-state reaction

ISSN 1004-0609
CN 43-1238/TG
CODEN: ZYJXFK

ISSN 1003-6326
CN 43-1239/TG
CODEN: TNMCEW

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