کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1610321 | 1516275 | 2015 | 7 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Preparation of Ni(OH)2-graphene sheet-carbon nanotube composite as electrode material for 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
Ni(OH)2-graphene sheet-carbon nanotube composite was prepared for supercapacitance materials through a simple two-step process involving solvothermal synthesis of graphene sheet-carbon nanotube composite in ethanol and chemical precipitation of Ni(OH)2. According to N2 adsorption/desorption analysis, the Brunauer-Emmett-Teller surface area of graphene sheet-carbon nanotube composite (109.07 m2 gâ1) was larger than that of pure graphene sheets (32.06 m2 gâ1), indicating that the added carbon nanotubes (15 wt.%) could prevent graphene sheets from restacking in the solvothermal reaction. The results of field emission scanning electron microscopy and transmission electron microscopy showed that Ni(OH)2 nanosheets were uniformly loaded into the three-dimensional interconnected network of graphene sheet-carbon nanotube composite. The microstructure enhanced the rate capability and utilization of Ni(OH)2. The specific capacitance of Ni(OH)2-graphene sheet-carbon nanotube composite was 1170.38 F gâ1 at a current density of 0.2 A gâ1 in the 6 mol Lâ1 KOH solution, higher than those provided by pure Ni(OH)2 (953.67 Fgâ1) and graphene sheets (178.25 F gâ1). After 20 cycles at each current density (0.2, 0.4, 0.6, 0.8, 1.0 and 1.2 A gâ1), the capacitance of Ni(OH)2-graphene sheet-carbon nanotube composite decreased 26.96% of initial capacitance compared to 74.52% for pure Ni(OH)2.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Alloys and Compounds - Volume 618, 5 January 2015, Pages 37-43
Journal: Journal of Alloys and Compounds - Volume 618, 5 January 2015, Pages 37-43
نویسندگان
Y.F. Liu, G.H. Yuan, Z.H. Jiang, Z.P. Yao, M. Yue,