کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5458664 | 1516173 | 2017 | 34 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Facile synthesis of NiAl layered double hydroxide nanoplates for high-performance asymmetric supercapacitor
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی مواد
فلزات و آلیاژها
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چکیده انگلیسی
NiAl layered double hydroxide (NiAl-LDH) is a promising electrode material for supercapacitor owing to its versatility in compositions, high theoretical capacitance, environmental benignity, and low cost. However, capacity fading of NiAl-LDH hinders its application in energy storage. Herein, we develop a facile hydrothermal approach to synthesize NiAl-LDH nanoplates (H-NiAl-LDH) possessing high electrochemical activity and desirable morphology to improve ion diffusion kinetics and reduce charge transfer resistance, leading to enhanced specific capacitance compared to pristine NiAl-LDH (P-NiAl-LDH) grown by co-precipitation method. Scanning electron microscopy shows that the H-NiAl-LDH are as thin as â¼30Â nm with a mean lateral dimension of â¼150Â nm. The H-NiAl-LDH electrode delivers remarkably high specific capacitance of 1713.2Â FÂ gâ1 at 1Â AÂ gâ1 and good cycling ability of 88% capacitance retention over 5000 cycles compared to only 757.1Â FÂ gâ1 at 1Â AÂ gâ1 and 76.4% of the P-NiAl-LDH. An asymmetric supercapacitor (ASC) is assembled using H-NiAl-LDH and graphene as positive and negative electrodes, respectively. The ASC operating at 1.4Â V delivers a high specific capacitance of 125Â FÂ gâ1 at 1Â AÂ gâ1 with a high energy density of 34.1 Wh kgâ1 at a power density of 700Â WÂ kgâ1 and outstanding cyclic stability of 91.8% capacitance retention after 5000 cycles.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Alloys and Compounds - Volume 721, 15 October 2017, Pages 803-812
Journal: Journal of Alloys and Compounds - Volume 721, 15 October 2017, Pages 803-812
نویسندگان
Lei Li, Kwan San Hui, Kwun Nam Hui, Qixun Xia, Jianjian Fu, Young-Rae Cho,