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Modification of the Microstructure and Transport Properties of $La_{2}CuO_{4−δ}$ Electrodes via Halogenation Routes
| Content Provider | MDPI |
|---|---|
| Author | Luc, ía dos Santos-Gómez Javier, Zamudio-García Jos, é M. Porras-Vázquez David, Marrero-López Losilla, Enrique R. |
| Copyright Year | 2022 |
| Description | Ruddlesden–Popper type electrodes with composition $La_{2}CuO_{4−δ}$ are alternative cathode materials for solid oxide fuel cells (SOFCs); however, the undoped compound exhibits low electrical conductivity for potential applications, which is usually increased by alkaline-earth doping. A promising alternative to alkaline-earth doping is the modification of the anionic framework by halogen doping. In this study, $La_{2}CuO_{4−0.5x}A_{x}$ (A = F, Cl, Br; x = 0–0.3) compounds are prepared by a freeze-drying precursor method, using an anion doping strategy. The composition, structure, morphology and electrical properties are studied to evaluate their potential use in solid oxide fuel cells (SOFCs). The halogen-doped materials show higher electrical conductivity and improved electrocatalytic activity for oxygen reduction reactions when compared to the pristine material, with polarization resistance values 2.5 times lower, i.e., 0.20, 0.11 and 0.08 Ω $cm^{2}$ for undoped, F- and Cl-doped samples, respectively, at 800 °C. Moreover, halogen doping prevents superficial copper segregation in $La_{2}CuO_{4−δ}$, making it an attractive strategy for the development of highly efficient electrodes for SOFCs. |
| Starting Page | 1206 |
| e-ISSN | 22279717 |
| DOI | 10.3390/pr10061206 |
| Journal | Processes |
| Issue Number | 6 |
| Volume Number | 10 |
| Language | English |
| Publisher | MDPI |
| Publisher Date | 2022-06-16 |
| Access Restriction | Open |
| Subject Keyword | Processes Energy and Fuel Technology La2cuo4−δ Ruddlesden–popper Anion Doping Halogenation Solid Oxide Fuel Cell |
| Content Type | Text |
| Resource Type | Article |
