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-MnO2和γ-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.
参考文献
| [1] | CONWAY B E .Transirion from supercapacitors to battery behavior in electrochemical energy storage[J].Journal of the Electrochemical Society,1991,138(06):1539-1548. |
| [2] | Sajdl B;Micka K;Krtil P .Study of the rechargeable manganese dioxide electrode[J].Electrochimica Acta,1995,40(12):2005-2011. |
| [3] | Mourad W E;Rophad M W;Khalil L B .Preparation and characterization of doped manganese dioxides[J].Journal of Applied Electrochemistry,1980,10(13):309-313. |
| [4] | Valand T;Gardner C L .Molybdenum trioxide doped manganese dioxide[J].Journal of Power Sources,1976,1(01):65-71. |
| [5] | Kahraman E;Binder L;Kordesch K .Overcharge protection of MnO2 cathodes[J].Journal of Power Sources,1991,36(01):45-56. |
| [6] | YAO Yung fang;Gupta N;Wroblowa H S .Rechargeable manganese oxide electrodes(part 1) :chemically modified materials[J].Journal of Electroanalytical Chemistry and Interfacial Electrochemistry,1987,223(1-2):107-117. |
| [7] | SULLIVAN M G;Kota R;Hass O .Thick active layers of electrochemically modified glassy carbon electrochemical impedance studies[J].Journal of the Electrochemical Society,2000,147(07):2636-2643. |
| [8] | 唐致远,耿新,王占良,薛建军.掺Fe3+MnO2超级电容器电极材料的制备[J].应用化学,2002(10):936-940. |
| [9] | 王秀丽,涂江平,张孝彬,高嵘岗,陈长聘.掺Cr纳米晶Mg2 Ni合金的气态储氢性能[J].中国有色金属学报,2002(05):907-911. |
| [10] | Lee H Y;Goodenough J B .Supercapacitor behaivior with KCl electrolyte[J].Journal of Solid State Chemistry,1999,144(01):220-223. |
| [11] | Liu Kuo-Chuan;Anderson M A .Porous nickel oxide/nickel films for electrochemical[J].Journal of the Electrochemical Society,1996,143(01):124-131. |
| [12] | 姚海军,张校刚,夏熙.纳米TiO2掺杂MnO2电极的电化学行为[J].电池,2003(01):6-7. |
| [13] | 彭振生,孙阳.Cr掺杂对La0.67Ca0.33MnO3物性的影响[J].安徽师范大学学报(自然科学版),2003(01):22-25. |
| [14] | 龚荣洲,沈翔,张磊,张凌.金属基纳米复合材料的研究现状和展望[J].中国有色金属学报,2003(05):1311-1320. |
| [15] | 李娟,龚良玉,夏熙.α-PbO纳米粉体的固相合成及其对MnO2电极材料的改性作用[J].应用化学,2001(04):264-268. |
上一张
下一张
上一张
下一张
计量
- 下载量()
- 访问量()
文章评分
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%