Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
4907638 | Journal of Electroanalytical Chemistry | 2017 | 22 Pages |
Abstract
A model for impedance of the cathode catalyst layer (CCL) with poor electronic conductivity Ïe is developed. In the case of small cell current, an analytical expression for the CCL impedance is derived. At small currents, finite Ïe increases the static cell resistivity by the value 1/(3Ïe). In addition, the CCL exhibits a pure ohmic resistivity, which is equivalent to proton and electronic resistivities connected in parallel. Finite Ïe distorts the shape of the Nyquist spectrum in the HF domain; the CCL proton conductivity Ïp can no longer be determined simply as a projection of the straight HF line onto the real axis. However, Ïp and Ïe can be found by fitting the model equations to the experimental spectra.
Related Topics
Physical Sciences and Engineering
Chemical Engineering
Chemical Engineering (General)
Authors
Andrei Kulikovsky,