用不同晶型的MnO2粉体制备了β-MnO2和γ-MnO2电极,用循环伏安和恒流充放电试验研究了上述两种电极的电化学特性。结果表明：β-MnO2和γ-MnO2电极都具有良好的电容性能,但后者具有更为良好的倍率放电性能,适合大电流充放电;在300mA.g-1的电流密度下,经5 000个循环充放电之后,β-MnO2电极已失效,而γ-MnO2电极的容量保持率还高达89.2%。
The β-typed and γ-typed electrodes were prepared by MnO2 powders with different crystal forms,and the electrochemical properties of the above-mentioned electrodes were studied by cyclic voltammetry method and constant-current charge and discharge test.The results show that both the β-typed and γ-typed electrodes had good capacitance property,and the γ-MnO2 electrode had better rate discharge property and was more suitable for charge-discharge of larger current.Under the condition of the current density of 300 mA·g-1,the β-MnO2 electrode became invalid but the capacitance retention of γ-MnO2 electrode was still as high as 89.2% after circulatory charge-discharge 5 000 cycles.
参考文献
| [1] | 庞旭,马正青,左列.Sn掺杂二氧化锰超级电容器电极材料[J].物理化学学报,2009(12):2433-2437. |
| [2] | 李生娟,王树林,徐波,高慧峰.氧化铋掺杂纳米二氧化锰/活性炭复合电极[J].化工学报,2008(02):514-519. |
| [3] | 江奇,瞿美臻,张伯兰,于作龙.电化学超级电容器电极材料的研究进展[J].无机材料学报,2002(04):649-656. |
| [4] | Mengqiang Wu;Graeme A. Snook;George Z. Chen;Derek J. Fray .Redox deposition of manganese oxide on graphite for supercapacitors[J].Electrochemistry communications,2004(5):499-504. |
| [5] | 夏熙.二氧化锰及相关锰氧化物的晶体结构、制备及放电性能（1）[J].电池,2004(06):411-414. |
| [6] | 张治安,杨邦朝,邓梅根,胡永达.无定型氧化锰超级电容器电极材料[J].功能材料与器件学报,2005(01):58-62. |
| [7] | Jiang, H.;Zhao, T.;Ma, J.;Yan, C.;Li, C. .Ultrafine manganese dioxide nanowire network for high-performance supercapacitors[J].Chemical communications,2011(4):1264-1266. |
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