Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7706117 | International Journal of Hydrogen Energy | 2018 | 7 Pages |
Abstract
The electrochemical performance of the impregnated La0.6Sr0.4Co0.2Fe0.8O3âδ-Y2O3 stabilized ZrO2 cathode (LSCF-YSZ) was studied with different amount of LSCF. Function as PO2, electrode resistance revealed that the rate-determining steps for oxygen reduction were changed with amount of LSCF loading. The rate-determining step is the charge transfer process for 12 wt% LSCF loading cathode. With the increasing amount of LSCF particles on the YSZ scaffold, the rate determining steps are the dissociation of oxygen molecules and adsorption-diffusion of oxygen atom for 20 wt% LSCF loading cathode. Accumulation of a great many LSCF particles on the YSZ scaffold makes the Knudsen diffusion of oxygen molecular of great importance for ORR. The rate-determining step is the Knudsen diffusion for 32 wt% LSCF loading cathode. The mean free path of oxygen molecules is about 0.22-0.27 μm at 1 atm and the temperature is between 600 and 800 °C. The appearance of inductive loop in the EIS for the cathode with high LSCF loading was possible influenced by the Knudsen diffusion process.
Keywords
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Physical Sciences and Engineering
Chemistry
Electrochemistry
Authors
Jing Chen, Dongjin Wan, Xuzhuo Sun, Bo Li, Mingxia Lu,