引用本文:
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, 19(10): 936-940.
Citation: TANG Zhi-Yuan, GENG Xin, WANG Zhan-Liang, XUN Jian-Jun. Preparation of Fe3+ Doped Manganese Dioxide for Electrode Material of Supercapacitor[J]. Chinese Journal of Applied Chemistry, 2002, 19(10): 936-940.
Citation: TANG Zhi-Yuan, GENG Xin, WANG Zhan-Liang, XUN Jian-Jun. Preparation of Fe3+ Doped Manganese Dioxide for Electrode Material of Supercapacitor[J]. Chinese Journal of Applied Chemistry, 2002, 19(10): 936-940.
掺Fe3+MnO2超级电容器电极材料的制备
摘要:
以低温固相反应法制备MnO2及该材料化学掺杂Fe3+,获得的电极材料借助X射线衍射、扫描电镜测试对其物理性质作了表征。以MnO2作为超级电容器电极材料的单电极活性物比电容为311~149 F/g,掺杂Fe3+的电极材料比电容为318~114 F/g(电流密度50~1000 mA/g)。由这些材料制得的超级电容器的比能量分别为27.6~9.95 W·h/Kg和28~10 W·h/Kg。从充放电曲线可见,化学掺杂的配比对电化学性能的影响较大,掺杂量为n(Mn):n(Fe)=10:1时,材料具有良好的放电性能,而其它配比对MnO2的包覆起到了钝化膜的作用。从1000次的循环性能看,在电流密度为1000 mA/g时,掺杂MnO2比未掺杂的具有较好的循环性,二者的比电容分别衰减到90%和70%,表明化学掺杂Fe3+有利于提高MnO2电极的放电性能和循环性。
English
Preparation of Fe3+ Doped Manganese Dioxide for Electrode Material of Supercapacitor
Abstract:
MnO2 and Fe3+ doped MnO2 used as electrode materials were prepared by solid state reaction and characterized by XRD and SEM. The latter showed better electrochemical performances. The specific capacitances of pure MnO2 and iron doped MnO2 were 311~149 F/g and 318~114 F/g(mass of single electrode active matter), respectively, at current density of 50~1000 mA/g. The specific energy values of supercapacitors fabricated by these materials were 27.6~9.95 W·h/Kg and 28~10 W·h/Kg, respectively. It appeared that the ratio of Fe3+ in samples had greater effect on the electrochemical capacity. The better discharge capacity could be obtained when the mole ratio of Mn(Ⅳ) to Fe(Ⅲ) was 10. The capacitors consisted of modified MnO2 was more stable in cycling than those made of MnO2 and their specific capacitance after 1000 cycles decreased to 90% and 70%, respectively, at current density 1000 mA/g.
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Key words:
- manganese dioxide
- / supercapacitor
- / electrode material
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