Surface modification of carbon materials by nitrogen/phosphorus co-doping as well as redox additive of ferrous ion for cooperatively boosting the performance of supercapacitors
| Autor: | Zhen Qiang Wang, Zhong Jie Zhang, Xiang Ying Chen, Xin Ming Yang, Bing Han, Ming Hui Gao, Kun Yang Zhao |
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| Rok vydání: | 2020 |
| Předmět: |
Supercapacitor
Materials science Dopant General Chemical Engineering Doping Inorganic chemistry General Engineering General Physics and Astronomy 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology Electrochemistry 01 natural sciences Redox 0104 chemical sciences Ion Electrode Surface modification General Materials Science 0210 nano-technology |
| Zdroj: | Ionics. 26:3027-3039 |
| ISSN: | 1862-0760 0947-7047 |
| DOI: | 10.1007/s11581-019-03406-6 |
| Popis: | In this work, we demonstrate a cooperative strategy of surface modification of carbon materials by N/P co-doping and redox additive of Fe2+ ion for boosting the performance of supercapacitors. Using NH4HCO3 or NH4H2PO4 as N/P dopants, the modified carbon materials have increased concerning the electrical conductivity, porosity, and N/P contents. Furthermore, Fe2+ ion serving as redox additive has been incorporated. In a three-electrode configuration, the C-N-P-Fe sample exhibits capacitance of 371 F g−1, which is 2.38 times larger than the C-Blank-Fe sample; the redox process of Fe2+ ions is controlled by the diffusion. In a two-electrode configuration, the C-N-P-Fe sample delivers energy density of 7.7 Wh kg−1, almost 2.33 times higher than the C-Blank-Fe sample. Moreover, it unveils that the pseudo-capacitance contribution has been improved with increasing N/P doping by Trasatti method; the redox process of Fe2+ ions predominantly happens on negative electrode. |
| Databáze: | OpenAIRE |
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