Hydrothermal synthesis of graphene-encapsulated 2D circular nanoplates of α-Fe2O3 towards enhanced electrochemical performance for supercapacitor
| Autor: | Zaifang Yuan, Yang Zhou, Meng Li, Shuangshuang Zhu, Ying Long, Xuefeng Zou, Yuejing Zeng, Yingzhang Wang, Bin Xiang, Qibing Wu |
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| Rok vydání: | 2019 |
| Předmět: |
Supercapacitor
Materials science Nanocomposite Graphene Mechanical Engineering Metals and Alloys Oxide 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology Electrochemistry 01 natural sciences Capacitance Hydrothermal circulation 0104 chemical sciences law.invention chemistry.chemical_compound Chemical engineering chemistry Mechanics of Materials law Materials Chemistry Hydrothermal synthesis 0210 nano-technology |
| Zdroj: | Journal of Alloys and Compounds. 775:63-71 |
| ISSN: | 0925-8388 |
| Popis: | Transition metal oxides especially Fe2O3 has been widely considered as a potential electrode material for current commercial supercapacitors. However, the low electronic conductivity limits the obtained specific capacitance and cycle stability of supercapacitor devices. In the present work, 2D nano-circular-like α-Fe2O3 coupled reduced graphene oxide (rGO) composites have been synthesized for the first time via a simple, inexpensive hydrothermal process. Moreover, circular α-Fe2O3 nanoplates are well-dispersed on rGO layers, which can offer abundant active sites and effectively buffer the reunion of α-Fe2O3 nanocomposites during the electrochemical reactions. At an optimal ratio of 10 wt% GO, the as-prepared sample exhibits electrochemical performance with excellent specific capacitance of 621.3 F g−1 at 5 mV−1 and 533 F g−1 at 1 A g−1, which is better than that of pure α-Fe2O3. Most attractively, the specific capacitance is highly retained about 77% after 14000 cycles, revealing superior cycle ability. |
| Databáze: | OpenAIRE |
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