کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
4762665 | 1362234 | 2018 | 39 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Polyaniline-assisted growth of MnO2 ultrathin nanosheets on graphene and porous graphene for asymmetric supercapacitor with enhanced energy density
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی شیمی
مهندسی شیمی (عمومی)
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
To enhance the energy density of supercapacitors, an asymmetric supercapacitor was prepared by well-matched graphene@MnO2 nanosheets (G@MnO2) as cathode material and porous graphene as anode material. The hierarchical MnO2 ultrathin nanosheets uniformly decorating on graphene sheets were prepared by polyaniline-assisted growth method. The obtained G@MnO2 composite can provide fast electron transfer rate and efficient space to decrease the length of ion diffusion during energy storage. Therefore, the G@MnO2 electrode exhibits a high specific capacitance reaching 245.0â¯Fâ¯gâ1 at 0.5â¯Aâ¯gâ1, 74.5% of retention ratio at 20â¯Aâ¯gâ1. Meanwhile the assembled asymmetric supercapacitor delivers a high energy density of 30.6â¯Wâ¯hâ¯kgâ1, and a remarkable energy density of 7.9â¯Wâ¯hâ¯kgâ1 at ultrahigh power density of 11,804â¯Wâ¯kgâ1 due to the well-assembly of G@MnO2 and porous graphene with the similar capacitance and rate performance. Moreover, the asymmetric supercapacitor also shows an excellent cycle life with 8.5% loss of the initial specific capacitance after 10,000 cycles. The excellent electrochemical performance of the asymmetric supercapacitor of G@MnO2//porous graphene makes it an attractive candidate for high power and energy storage systems.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Chemical Engineering Journal - Volume 334, 15 February 2018, Pages 1-9
Journal: Chemical Engineering Journal - Volume 334, 15 February 2018, Pages 1-9
نویسندگان
Liang Wang, Yu Ouyang, Xinyan Jiao, Xifeng Xia, Wu Lei, Qingli Hao,