کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5437373 | 1398173 | 2017 | 8 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Optimized K+ pre-intercalation in layered manganese dioxide nanoflake arrays with high intercalation pseudocapacitance
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی مواد
سرامیک و کامپوزیت
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
Intercalation pseudocapacitance is emerging as a highly promising mechanism for high rate energy storage applications. However, it is still debatable how the alkali metal ion pre-intercalation in layered metal oxides affects the intercalation pseudocapacitance. Hereinï¼the layered birnessite-MnO2 nanoflakes with K+ pre-intercalation were in- situ fabricated on the graphene foam via a one-step facile hydrothermal method. The amount of pre-intercalated K+ can be controlled by adjusting the reaction parameter. The electrochemical tests indicate that the amount of pre-intercalated ions has the optimal value and intercalated slight or excessive amount of ions may lead to the pseudocapacitance decline. The K0.19MnO2/graphene foam electrode shows a high pseudocapaitance of 344Â FÂ gâ1 (based on the mass of the whole electrode) at a scan rate of 2Â mVÂ sâ1, which is the best among the as-prepared samples. Cycling tests demonstrate that the pre-intercalated K+ can greatly improve the cycling stability of layered birnessite-MnO2 nanoflakes. This work provides new insights on understanding the role of pre-intercalation ions and brings new strategies to further improve the performance of layered metal oxide electrodes.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Ceramics International - Volume 43, Issue 17, 1 December 2017, Pages 14897-14904
Journal: Ceramics International - Volume 43, Issue 17, 1 December 2017, Pages 14897-14904
نویسندگان
Lin Li Cao, Bao Zhi Yu, Tao Cheng, Xin Liang Zheng, Xing Hua Li, Wei Long Li, Zhao Yu Ren, Hai Ming Fan,