کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1609169 1516258 2015 8 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Enhanced performance of nickel–aluminum layered double hydroxide nanosheets/carbon nanotubes composite for supercapacitor and asymmetric capacitor
ترجمه فارسی عنوان
عملکرد پیشرفته نانولوله های هیدروکسید دو لایه نیکل، لایه نازک / کربن نانولوله های کربن برای ابررساناها و خازن نامتقارن
کلمات کلیدی
هیدروکسید دو لایه آلومینیومی نیکل، نانولوله های کربنی، ابرخازنها، عملکرد الکتروشیمیایی
موضوعات مرتبط
مهندسی و علوم پایه مهندسی مواد فلزات و آلیاژها
چکیده انگلیسی


• NiAl-LDH nanosheets are in situ grown on carbon nanotubes pre-coated by Al2O3.
• NiAl-LDH/CNTs exhibits a specific capacitance of 1500 F g−1 at 1 A g−1 with a good cycling stability.
• The NiAl-LDHs/CNTs//AC asymmetric supercapacitor shows a high electrochemical performance.

Binary composite consisting of nickel aluminum-layered double hydroxides (LDHs) nanosheets and carbon nanotubes (CNTs) is fabricated by a solution method. The CNTs are pre-coated by γ-Al2O3. The structural characterization and morphological observation demonstrate that Ni–Al hydroxide crystals with hydrotalcite structure are in situ deposited on the surface of CNTs. The as-prepared binary composite combines the pseudo-capacitive of Ni–Al LDHs with double-layer capacitive of carbon nanotubes. CNTs can improve the electrical conductivity and decrease the electrochemical polarization of the composite. Electrochemical measurements of the Ni–Al LDHs/CNTs material show a much better electrochemical performance than pure Ni–Al LDHs. It can yield a high specific capacitance of 1500 F g−1 at 1 A g−1, with 70.3% retention at 10 A g−1 in 2 M KOH and a good cycling stability. An asymmetric capacitor is assembled with Ni–Al LDHs/CNTs as a positive electrode and activated carbon as the negative electrode. It can cycle reversibly in a potential window of 1.8 V, and exhibits a high specific capacitance of 115 F g−1 and a high energy density of 52 W h kg−1 at 1 A g−1 as well as an excellent cycling stability.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Alloys and Compounds - Volume 635, 25 June 2015, Pages 225–232
نویسندگان
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