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【求助】二氧化锰在锂空气电池中起什么作用呢 已有7人参与
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dwkong
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燕子206(金币+1): 2010-11-21 16:27:31
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The common way to prepare MnO2-catalyzed carbon is the mixing of a manganese salt and potassium permanganate solutions in the presence of suspended carbon substrate (2MnO4 ? +3Mn2+ +2H2O→5MnO2 +4H+). The porosity of the carbon substrate does not remain unchanged in course of this process. The substrate undergoes modification due to the reaction between the carbon and permanganate. As a result of this reaction, some of closed pores turn to be opened, and some open pores turn to be widened. This effect may be particularly distinct after the catalyzed substrate thermo-treatment. As-deposited MnO2 particles camouflage the pore orifices, but the oxide particles undergo dehydration being heated, and thus shrink and expose more carbon pore volume. This MnO2-catalized carbon substrate behavior was demonstrated in the study of Cheng et al. [36], which has revealed that charge capacity of the carbon, catalyzed in KMnO4/MnSO4-process, was superior to the charge capacity of the same carbon catalyzed by mixing with MnO2- powder. Also it was found that the thermo-treatment (300 ?C) enhanced the charge capacity of the KMnO4/MnSO4-catalyzed carbon; the latter may be understood as the result of dehydration – and hence shrinking – of KMnO4/MnSO4-prepared MnO2 particles (MnO2 ×1.3H2O300 ?C→MnO2 ×0.26H2) [40]. |
12楼2010-11-19 14:56:14
2楼2010-11-05 09:32:17
jesuiszidane
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3楼2010-11-05 15:20:54
坏男孩№亮
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4楼2010-11-05 16:30:39
