| Autor: |
Hyun-Kon Song, Hee-Young Hwang, Kun-Hong Lee, Le H. Dao |
| Rok vydání: |
2000 |
| Předmět: |
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| Zdroj: |
Electrochimica Acta. 45:2241-2257 |
| ISSN: |
0013-4686 |
| DOI: |
10.1016/s0013-4686(99)00436-3 |
| Popis: |
The transmission line model with pore size distribution (TLM-PSD) developed for blocking electrodes without faradaic reactions in our previous work was reformulated on the basis of the distribution of the penetrability coefficient α0, which is a more generalized concept than the distribution of pore size. Impedances were simulated using the TLM-PSD model for four different pore size distributions (PSD). Although different shapes of the Nyquist curve was obtained depending upon the different PSD, all simulated impedances share a common point that an increase in the width of a distribution (Pσ) leads to a more inclined Nyquist curve at high penetrability (αμ). This is because the effect of small pores on the total impedance increases with Pσ. We fitted the experimental impedance data of a carbon membrane with the TLM-PSDs and the de Levie’s model (TLM-δ). The fitting by TLM-PSD was successful while TLM-δ could not describe the impedance of the porous electrode at low frequency range. In addition, the geometric parameters estimated by TLM-PSD agreed with physically available values. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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