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Enhanced Performance of $La_{0.8}Sr_{0.2}FeO_{3-δ}-Gd_{0.2}Ce_{0.8}O_{2-δ}$ Cathode for Solid Oxide Fuel Cells by Surface Modification with $BaCO_{3}$ Nanoparticles
| Content Provider | MDPI |
|---|---|
| Author | Desta, Halefom G. Yang, Yang Teketel, Birkneh Sirak Yang, Quan Song, Kai Zhu, Shiyue Tian, Dong Chen, Yonghong Luo, Tianyong Lin, Bin |
| Copyright Year | 2022 |
| Description | Recently, Fe-based perovskite oxides, such as $Ln_{1-x}Sr_{x}FeO_{3-δ}$ (Ln = La, Pr, Nd, Sm, Eu) have been proposed as potential alternative electrode materials for solid oxide fuel cells (SOFCs), due to their good phase stability, electrocatalytic activity, and low cost. This work presents the catalytic effect of $BaCO_{3}$ nanoparticles modified on a cobalt-free $La_{0.8}Sr_{0.2}FeO_{3-δ}-Gd_{0.2}Ce_{0.8}O_{2-δ}$ (LSF-GDC) composite cathode at an intermediate-temperature (IT)-SOFC. An electrochemical conductivity relaxation investigation (ECR) shows that the $K_{chem}$ value of the modified LSF-GDC improves up to a factor of 17.47, demonstrating that the oxygen reduction process is effectively enhanced after surface impregnation by $BaCO_{3}$. The area-specific resistance (ASR) of the LSF-GDC cathode, modified with 9.12 wt.% $BaCO_{3}$, is 0.1 $Ω.cm^{2}$ at 750 °C, which is about 2.2 times lower than that of the bare cathode (0.22 $Ω.cm^{2}$). As a result, the anode-supported single cells, with the modified LSF-GDC cathode, deliver a high peak power density of 993 $mW/cm^{2}$ at 750 °C, about 39.5% higher than that of the bare cell (712 $mW/cm^{2}$). The single cells based on the modified cathode also displayed good performance stability for about 100 h at 700 °C. This study demonstrates the effectiveness of $BaCO_{3}$ nanoparticles for improving the performance of IT-SOFC cathode materials. |
| Starting Page | 884 |
| e-ISSN | 2072666X |
| DOI | 10.3390/mi13060884 |
| Journal | Micromachines |
| Issue Number | 6 |
| Volume Number | 13 |
| Language | English |
| Publisher | MDPI |
| Publisher Date | 2022-05-31 |
| Access Restriction | Open |
| Subject Keyword | Micromachines Electrochemistry Sofcs Fe-based Perovskite Oxide Impregnation Surface Exchange Kinetics Baco3 |
| Content Type | Text |
| Resource Type | Article |
