期刊
JOURNAL OF MATERIALS CHEMISTRY A
卷 3, 期 12, 页码 6662-6670出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c5ta00328h
关键词
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资金
- National Natural Science Foundation of China [51173042]
- Shanghai Municipal Science and Technology Commission [12nm0504102]
- Fundamental Research Funds for the Central Universities
The real-world applications of supercapacitors are hindered by their relatively low energy density compared with rechargeable batteries. Even with tremendous efforts in developing cathodes for aqueous asymmetric supercapacitors (AASCs), their supercapacitive performance is still severely restricted by the low specific capacitance of anodes which mostly consist of carbonaceous materials. We developed a novel low-cost anode of homogenous Fe2O3 nanowires grown on carbon fiber paper (CFP) that achieves a high specific capacitance of 908 F g(-1) at 2 A g(-1) and excellent rate performance (90% capacitance retention up to 10 A g(-1)) in a wide negative potential window of 0 to -1.35 V. Such an excellent supercapacitive performance makes it a perfect anode compared with other reported ones. Matching it with the NiO nanoflake cathode (1520 F g(-1) at 2 A g(-1) in 0-0.45 V) on CFP, an extremely high energy density of 105 W h kg(-1) is obtained at a power density of 1400 W kg(-1) and still retains 72.6 W h kg(-1) at 12 700 W kg(-1) for the AASCs, which is much superior to previously reported AASCs and even exceeding those of Ni-MH batteries.
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