期刊
NANO ENERGY
卷 45, 期 -, 页码 390-397出版社
ELSEVIER
DOI: 10.1016/j.nanoen.2018.01.015
关键词
Pseudocapacitors; Hematite; Amorphous layer; Oxygen defects; Interface; Large-scale
类别
资金
- National Natural Science Foundation of China [51572129, 51602158, 51772154]
- International S&T Cooperation Program of China [2016YFE0111500]
- Natural Science Foundation of Jiangsu Province [BK20160835, BK20170036]
- Fundamental Research Funds for the Central Universities [30915011204, 30916011352]
- Russian Foundation for Basic Research [16-29-06439]
- MOE Key Laboratory of Bioinorganic and Synthetic Chemistry (Sun Yat-Sen University, Guangzhou, China)
- XPS analysis
Poor electronic conductivity and sluggish ion diffusion are the two main obstacles that limit the pseudocapacitive performance of Fe2O3. In this work, oxygen-deficient Fe2O3-delta nanorod arrays with a unique crystalline core/amorphous shell heterostructure are prepared via a facile and controllable method. The tunable amorphous layer facilitates the Li+ diffusion while introduced oxygen defects in Fe2O3 can be effectively tuned to improve electronic conductivity. More importantly, the resultant crystalline/amorphous interface greatly increases charge storage sites for improved specific capacitance. Consequently, the crystalline core/amorphous shell Fe2O3-delta integrated on graphene delivers a large capacitance of 701 F g(-1) (701 mF cm(-2)) at 1 A g(-1), which is almost double the capacitance of the conventional Fe2O3-delta nanorods without amorphous surface layer on graphene. Besides large capacitance, the electrode also exhibits greatly improved rate capability and cycle performance. To construct asymmetric supercapacitor, similar strategy is implemented to prepare Co3O4-delta nanosheet arrays with superior pseudocapacitive performance compared to its pristine counterpart. Importantly, flexible and large-scale (10 x 10 cm(2)) asymmetric supercapacitors are fabricated with promising device performance, demonstrating the smart electrode design is promising for practical application.
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