کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1291347 973353 2009 8 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Electrochemical cyclability mechanism for MnO2 electrodes utilized as electrochemical supercapacitors
موضوعات مرتبط
مهندسی و علوم پایه شیمی الکتروشیمی
پیش نمایش صفحه اول مقاله
Electrochemical cyclability mechanism for MnO2 electrodes utilized as electrochemical supercapacitors
چکیده انگلیسی

The electrochemical cyclability mechanism of nanocrystalline MnO2 electrodes with rock salt-type and hexagonal ɛ-type structures was investigated to determine the relationship between physicochemical feature evolution and the corresponding electrochemical behaviour of MnO2 electrodes. Rock salt MnO2 and hexagonal ɛ-MnO2 electrodes, with fibrous and porous morphologies, evolve into the antifluorite-type MnO2 with a petal-shaped nanosheet structure after electrochemical cycling, similar to that observed in nanocrystalline antifluorite-type MnO2 electrodes after electrochemical cycling. However, a different impedance response was observed for the rock salt MnO2 and hexagonal ɛ-MnO2 electrodes during the charge–discharge cycles, compared with the improved impedance response observed for the cycled antifluorite-type MnO2. A dissolution–redeposition mechanism is proposed to account for the impedance response of the MnO2 electrodes with different morphologies and crystal structures.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Power Sources - Volume 186, Issue 2, 15 January 2009, Pages 543–550
نویسندگان
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