کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
6471246 | 1424117 | 2017 | 22 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Hierarchical Core-Shell Nanosheet Arrays with MnO2 Grown on Mesoporous CoFe2O4 Support for High-Performance Asymmetric Supercapacitors
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی شیمی
مهندسی شیمی (عمومی)
پیش نمایش صفحه اول مقاله
![عکس صفحه اول مقاله: Hierarchical Core-Shell Nanosheet Arrays with MnO2 Grown on Mesoporous CoFe2O4 Support for High-Performance Asymmetric Supercapacitors Hierarchical Core-Shell Nanosheet Arrays with MnO2 Grown on Mesoporous CoFe2O4 Support for High-Performance Asymmetric Supercapacitors](/preview/png/6471246.png)
چکیده انگلیسی
We demonstrated the design and fabrication of unique core-shell CoFe2O4@MnO2 nanosheets arrays (NSAs) on nickel foam via a facile and scalable method. The CoFe2O4 nanosheets (NSs) grown on the nickel foam acted as a porous skeleton with large surface areas for the growth of MnO2 NSs, achieving the enhancement of both the electrical and the ionic conductivities. Ultrathin MnO2 NSs were found vertically grown on the CoFe2O4 NSs in a core-shell nanoarchitecture. Its thickness can be controlled by retention times during the hydrothermal process. The obtained CoFe2O4@MnO2 NSAs electrode achieved a highly enhanced areal capacitance of 3.59Â FÂ cmâ2 at a current density of 2Â mAÂ cmâ2. An aqueous asymmetric supercapacitor (ASC) device was assembled using CoFe2O4@MnO2 NSAs as its positive electrode and the activated carbon (AC) as its negative electrode. The as-assembled ASC device can be operated in a voltage region of 1.6Â V and exhibited a specific capacitance of 103.86Â FÂ gâ1 at 5Â mAÂ cmâ2. Its energy density and power density were as high as 37Â W h kgâ1 at 470Â WÂ kgâ1 and 4800Â WÂ kgâ1 at 15.3Â W h kgâ1, respectively. These remarkable electrochemical properties suggested that such CoFe2O4@MnO2 NSAs nanoarchitecture could be one of a potential candidates for the next generation energy storage devices with higher energy density delivery.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Electrochimica Acta - Volume 240, 20 June 2017, Pages 31-42
Journal: Electrochimica Acta - Volume 240, 20 June 2017, Pages 31-42
نویسندگان
Hongyan Gao, Shaokui Cao, Yan Cao,