کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
7990123 | 1516126 | 2018 | 26 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Facile synthesis of NiAl-LDH/MnO2 and NiFe-LDH/MnO2 composites for high-performance asymmetric supercapacitors
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی مواد
فلزات و آلیاژها
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
In this work, NiAl-LDH/MnO2 and NiFe-LDH/MnO2 composites are synthesized via a facile hydrothemal method, followed by loading of MnO2 through a redox reaction. MnO2 particles are loaded on the surface of LDH nanosheets, leading to the high electrochemical performance of the composites. The as-prepared NiAl-LDH/MnO2-6 exhibits a specific capacitance of 1092â¯Fâ¯gâ1â¯at 1â¯Aâ¯gâ1 and rate retention of 43.2% at 20â¯Aâ¯gâ1, which are higher than those of pure NiAl-LDH. Meanwhile, an asymmetric supercapacitor (ASC) with NiAl-LDH/MnO2-6 as a positive electrode and activated carbon (AC) as the negative electrode is assembled. It shows high capacitance (87.6â¯Fâ¯gâ1â¯at 1â¯Aâ¯gâ1), rate capability (58.4% at 10â¯Aâ¯gâ1), high energy density (30.4â¯Wh Kgâ1) and excellent cyclic stability (90.1% after 10000 cycles at 10â¯Aâ¯gâ1). The other electrode material NiFe-LDH/MnO2-16 exhibits a specific capacitance of 1127â¯Fâ¯gâ1â¯at 1â¯Aâ¯gâ1, and remains 69.8% at 20â¯Aâ¯gâ1. Meanwhile, NiFe-LDH/MnO2-16//AC ASC also shows high capacitance (81.7â¯Fâ¯gâ1â¯at 1â¯Aâ¯gâ1), rate capability (57.5% at 10â¯Aâ¯gâ1), energy density (27.3â¯Wh Kgâ1) and excellent cyclic stability (80.5% over 10000 cycles at 10â¯Aâ¯gâ1). These results indicate that the NiAl-LDH/MnO2 and NiFe-LDH/MnO2 hybrid electrodes could offer great promise in energy storage applications.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Alloys and Compounds - Volume 768, 5 November 2018, Pages 240-248
Journal: Journal of Alloys and Compounds - Volume 768, 5 November 2018, Pages 240-248
نویسندگان
Wenwen Zheng, Shiguo Sun, Yongqian Xu, Ruijin Yu, Hongjuan Li,