Design and theoretical study of carbon-based supercapacitors especially exhibiting superior rate capability by the synergistic effect of nitrogen and phosphor dopants
| Autor: | Min Wang, Zhong Jie Zhang, Xiang Ying Chen, Duo Duo Zhai, Hao Liu |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
Supercapacitor
Materials science Dopant Heteroatom Doping chemistry.chemical_element 02 engineering and technology General Chemistry 010402 general chemistry 021001 nanoscience & nanotechnology Electrochemistry 01 natural sciences Capacitance 0104 chemical sciences Chemical engineering chemistry General Materials Science 0210 nano-technology Carbon Nanosheet |
| Zdroj: | Carbon. 155:223-232 |
| ISSN: | 0008-6223 |
| DOI: | 10.1016/j.carbon.2019.08.066 |
| Popis: | Carbonaceous materials have long been a key component of supercapacitor energy storage systems, and exploring heteroatom doping and its role is currently the focus of carbon-based electrode development. Here, a method of in-situ doping a phosphorus atom into a nitrogen-containing hierarchical porous carbon nanosheet is proposed, which is realized by a self-synthesis and template-assisted assembly process. Phosphorus-doping improves the wettability of the carbon material and produces defects that expose more active sites, which facilitates charge transfer of the electrode material as a whole and at the interface. Density functional theory calculations proves that P-doping improves the affinity and ionic adsorption of the carbon surface, thereby increasing the specific capacitance (242 F g−1) and rate capability (70.8%). The synergistic effect of N/P co-doping provides rapid interfacial ion adsorption reactions that further improve electrochemical performance, including power density (15 kW kg−1) and high energy density (34.4 Wh kg−1) and ultra-high cycle stability (91.4%). This work opens up insights into the production of N/P co-doped carbon materials for supercapacitor applications. |
| Databáze: | OpenAIRE |
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