کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
7998335 | 1516249 | 2015 | 7 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Effect of low magnetic fields on the morphology and electrochemical properties of MnO2 films on nickel foams
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی مواد
فلزات و آلیاژها
پیش نمایش صفحه اول مقاله
![عکس صفحه اول مقاله: Effect of low magnetic fields on the morphology and electrochemical properties of MnO2 films on nickel foams Effect of low magnetic fields on the morphology and electrochemical properties of MnO2 films on nickel foams](/preview/png/7998335.png)
چکیده انگلیسی
Nanostructured MnO2 films have been deposited on nickel foams by a hydrothermal synthesis route under a low magnetic field. It was shown that even though the magnetic field was weak (at a level of several millitesla), it induced substantial change in the nanostructures and electrochemical properties of the MnO2 films. The as-prepared MnO2 thin films were largely amorphous and had a spherical superstructure composed of thin nanoflakes. The size of the microspheres decreased and, accordingly, the specific surface area increased with increasing magnetic field's strength. A probable formation mechanism for the nanostructures of MnO2 was proposed that the weak magnetic field enhanced the nucleation rate, and modified subsequent growth and aggregation processes, which all had a significant influence on the morphology and electrochemical performance of the MnO2 electrodes. The optimal MnO2 electrode synthesized under the low magnetic fields had a specific capacitance of 493.0Â FÂ gâ1 at 2.0Â AÂ gâ1 and a retention ratio of 95.6% over 1000 cycles. Therefore, low magnetic fields may be an economic and effective tool in hydrothermal synthesis of MnO2 electrodes for high-performance supercapacitors.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Alloys and Compounds - Volume 644, 25 September 2015, Pages 186-192
Journal: Journal of Alloys and Compounds - Volume 644, 25 September 2015, Pages 186-192
نویسندگان
Tao Zhu, Zhenni He, Guoxiong Zhang, Yisheng Lu, Chuan Lin, Yigang Chen, Haibo Guo,