| Autor: |
Soldatov, Sergey, Link, Guido, Silberer, Lucas, Schmedt, Clara Marie, Carbone, Emile, D’Isa, Federico, Jelonnek, John, Dittmeyer, Roland, Navarrete, Alexander |
| Jazyk: |
angličtina |
| Rok vydání: |
2020 |
| Předmět: |
|
| Zdroj: |
ACS energy letters, 6 (1), 124-130 |
| ISSN: |
2380-8195 |
| Popis: |
Among the pool of Power-to-X technologies, plasmas show high potential for the efficient use of intermittent renewable energies. High efficiencies of CO$_{2}$ conversion have been reported while using microwave plasmas at vacuum conditions which are, however, not suitable for CO$_{2}$ mitigation at industrial scales. Here we show that ultrafast pulsation of microwaves allow significant improvements of energy efficiencies during CO$_{2}$ splitting at atmospheric pressure as compared to continuous wave operation of the microwave source. Moreover, by the interrogation of the plasma with time-resolved optical emission spectroscopy we can, for the first time, observe the evolution of the vibrational and rotational temperatures and define a time window where nonequilibrium can be expected at the beginning of the pulse of an atmospheric CO$_{2}$ microwave plasma. In spite of the evidence of nonequilibrium in our system, thermal mechanism appears to dominate the CO$_{2}$ dissociation. It is shown that a fine control of the energy deposition in the plasma is possible with ultrafast pulsation of the microwave energy supply. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
|
