کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
7888182 | 1509793 | 2018 | 33 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Effect of graphene thickness on the morphology evolution of hierarchical NiCoO2 architectures and their superior supercapacitance performance
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی مواد
سرامیک و کامپوزیت
پیش نمایش صفحه اول مقاله
![عکس صفحه اول مقاله: Effect of graphene thickness on the morphology evolution of hierarchical NiCoO2 architectures and their superior supercapacitance performance Effect of graphene thickness on the morphology evolution of hierarchical NiCoO2 architectures and their superior supercapacitance performance](/preview/png/7888182.png)
چکیده انگلیسی
The rational design of electrode materials with special hierarchical architectures which possess both high surface area and conductivity is significant to enhance the performance of supercapacitors. Herein, hierarchical NiCoO2 architectures assembled by ultrathin mesoporous nanosheets are in-situ grown on graphene@Ni foam (G@NF) by a template-free solvothermal route and subsequent annealing process, which is used as self-supported and binder-free supercapacitor electrodes. The effect of graphene thickness on morphology evolution of NiCoO2 is investigated. Benefiting from the synergistic effect between graphene with remarkable conductivity and hierarchical NiCoO2 architectures with high specific capacity, the NiCoO2/G@NF electrodes show greatly improved electrochemical performance compared to NiCoO2@NF and G@NF. The optimized NiCoO2/G@NF has a specific capacitance of 1220Â F/g at 1Â A/g. While the NiCoO2@NF and G@NF are only 565 and 151Â F/g, respectively. The optimized NiCoO2/G@NF remains 840Â F/g at 20Â A/g, revealing a remarkable rate performance (69% capacity retention from 1 to 20Â A/g). Moreover, an outstanding cyclic stability of 80% capacitance retention can be obtained after 5000 charge/discharge cycles at 10Â A/g, whereas the NiCoO2@NF is only 46.5%. These results suggest that the hierarchical NiCoO2 architectures/graphene hybrids are good candidates as effective electrode materials for supercapacitors.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Ceramics International - Volume 44, Issue 5, 1 April 2018, Pages 4875-4882
Journal: Ceramics International - Volume 44, Issue 5, 1 April 2018, Pages 4875-4882
نویسندگان
Jinqi Wu, Yong Sun, Xi Yang, Guankui Long, Yan Zong, Xinghua Li, Xinliang Zheng,