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
موضوعات مرتبط
مهندسی و علوم پایه مهندسی مواد فلزات و آلیاژها
پیش نمایش صفحه اول مقاله
Facile synthesis of NiAl-LDH/MnO2 and NiFe-LDH/MnO2 composites for high-performance asymmetric supercapacitors
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 1092 F g−1 at 1 A g−1 and rate retention of 43.2% at 20 A g−1, 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 (87.6 F g−1 at 1 A g−1), rate capability (58.4% at 10 A g−1), high energy density (30.4 Wh Kg−1) and excellent cyclic stability (90.1% after 10000 cycles at 10 A g−1). The other electrode material NiFe-LDH/MnO2-16 exhibits a specific capacitance of 1127 F g−1 at 1 A g−1, and remains 69.8% at 20 A g−1. Meanwhile, NiFe-LDH/MnO2-16//AC ASC also shows high capacitance (81.7 F g−1 at 1 A g−1), rate capability (57.5% at 10 A g−1), energy density (27.3 Wh Kg−1) and excellent cyclic stability (80.5% over 10000 cycles at 10 A g−1). 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
نویسندگان
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