کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
6662935 | 463236 | 2013 | 9 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
High Li storage capacity of poorly crystalline porous δ-MnO2 prepared by hydrothermal route
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی شیمی
مهندسی شیمی (عمومی)
پیش نمایش صفحه اول مقاله
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چکیده انگلیسی
Poorly crystalline porous δ-MnO2 is synthesized by hydrothermal route from a neutral aqueous solution of KMnO4 at 180 °C and the reaction time of 24 h. The as-synthesized sample and also the sample heated at 300 °C have nanopetals morphology with large surface area. On heating at temperatures ⩾400 °C, there is a decrease in BET surface area and also a change in morphology from nanopetals to clusters of nanorods. Furthermore, the poorly crystalline δ-MnO2 converts into well crystalline α-MnO2 phase. The electrochemical lithium intercalation and de-intercalation studies in a non-aqueous electrolyte provide a high discharge specific capacity (275 mAh gâ1) at a specific current of 40 mA gâ1 for the poorly crystalline δ-MnO2 samples. The rate capability is also high. There is a decrease in capacity on repeated charge-discharge cycling. The specific capacity values of the crystalline α-MnO2 samples are considerably less than the values of poorly crystalline δ-MnO2 samples. Thus, the hydrothermal route facilitates preparation of poorly crystalline electrochemically active porous MnO2.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Electroanalytical Chemistry - Volume 703, 15 August 2013, Pages 126-134
Journal: Journal of Electroanalytical Chemistry - Volume 703, 15 August 2013, Pages 126-134
نویسندگان
Prasant Kumar Nayak, Tirupathi Rao Penki, N. Munichandraiah,