| Autor: |
Demling, Angelika, King, Sarah B., Shushkov, Philip, Stähler, Julia |
| Zdroj: |
The Journal of Physical Chemistry - Part C; February 2023, Vol. 127 Issue: 6 p2894-2900, 7p |
| Abstrakt: |
To develop a better understanding of electrochemical O2reduction in nonaqueous solvents, we apply two-photon photoelectron spectroscopy to probe the dynamics of O2reduction at a DMSO/Cu(111) model battery interface. By analyzing the temporal evolution of the photoemission signal, we observe the formation of O2–from a trapped electron state at the DMSO/vacuum interface. We find the vertical binding energy of O2–to be 3.80 ± 0.05 eV, in good agreement with previous results from electrochemical measurements, but with improved accuracy, potentially serving as a basis for future calculations on the kinetics of electron transfer at electrode interfaces. Modeling the O2diffusion through the DMSO layer enables us to quantify the activation energy of diffusion (31 ± 6 meV), the diffusion constant (1 ± 1 × 10–8cm2/s), and the reaction quenching distance for electron transfer to O2in DMSO (12.4 ± 0.4 Å), a critical value for evaluating possible mechanisms for electrochemical side reactions. These results ultimately will inform the development and optimization of metal–air batteries in nonaqueous solvents. |
| Databáze: |
Supplemental Index |
| Externí odkaz: |
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