摘要
Electrospun carbon nanotubes-embedded carbon nanofibers (CNF) fabric is employed as freestanding substrates for in-situ coating MnO2 nanostructures. Birnessite-type MnO2 nanoflakes are observed to grow vertically on individual CNF, thus building hierarchical coaxial architecture. This work presents an extensive study of the effect of temperature on the pseudo-capacitive behavior of the as-prepared freestanding MnO2@CNF composites electrodes in mild Na2SO4 electrolyte. The results show that the MnO2@CNF composites exhibit excellent pseudo-capacitive behaviors at different temperatures between 0 °C and 75 °C. The specific capacitance at 1 A g-1 increases from 365 F g-1 at 0 °C to 546 F g-1 at 75 °C, whereas the coulombic efficiency decreases with the increasing temperature, especially at lower charging rate. The cycling stability of the composites strongly depends on the temperature, i.e., 95.3% at 25 °C and 82.4% at 75 °C. This study provides a fundamental understanding of the temperature-dependent capacitive properties of MnO2 in mild electrolyte, which gives an insight into the supercapacitor design for industrial applications.
源语言 | 英语 |
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页(从-至) | 86-92 |
页数 | 7 |
期刊 | Journal of Power Sources |
卷 | 224 |
DOI | |
出版状态 | 已出版 - 15 2月 2013 |
已对外发布 | 是 |