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However, its catalytic activities for oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) are insufficient compared with traditional Co-based perovskite. Herein, we propose incorporating chlorine-anions (Cl\u2013) into LSF as the oxygen electrode for R-SOCs, synergistic optimization of lattice defects, electronic structure, and surface chemical properties of Fe-based perovskite, thereby significantly enhancing their ORR and OER catalytic activity. Experimental results combined with density functional theory (DFT) calculations showed that appropriate Cl\u2013 doping can increase the LSF unit cell volume and induce local lattice distortion and then significantly reduce oxygen vacancy formation energy (EVo\u00b7\u00b7) and increase oxygen vacancy (Vo\u00b7\u00b7) concentration. DFT calculations confirmed that Cl\u2013 doping can reduce the hybridization between Fe 3d and O 2p and weaken the covalency of metal\u2013oxygen bonds (Fe\u2013O), thereby facilitating the formation and redistribution of Vo\u00b7\u00b7. The oxygen surface exchange coefficient (kchem) and bulk diffusion coefficient (Dchem) of La0.5Sr0.5FeO2.95\u2013\u03b4Cl0.05 (LSFCl0.05) at 750 \u00b0C were increased by 3 times and 4 times, respectively. Distribution of relaxation time (DRT) showed that Cl\u2013 doping significantly enhances the adsorption and dissociation steps in the ORR process of the LSF oxygen electrode, thereby reducing the polarization impedance. A single cell with a LSFCl0.05 oxygen electrode achieved a maximum power density of 1.493 W\u00b7cm\u20132 in solid oxide fuel cell (SOFC) mode and a high electrolysis current density of 2.306 A\u00b7cm\u20132 in solid oxide electrolysis cell (SOEC) mode at 750 \u00b0C, and the performances were improved by 50% and 53%, respectively. Additionally, it demonstrated excellent long-term stability in both two modes and cycle stability between SOFC and SOEC modes. This work significantly enhances the catalytic activities of Fe-based perovskites for ORR\/OER, providing a practically feasible avenue for developing high performance oxygen electrode materials for R-SOCs.<\/jats:p>","DOI":"10.1021\/acsami.6c12711","type":"journal-article","created":{"date-parts":[[2026,10,14]],"date-time":"2026-10-14T21:02:37Z","timestamp":1792011757000},"page":"57402-57417","source":"Crossref","is-referenced-by-count":0,"title":["Chlorine-Anion Doping Induced Lattice Distortion to Enhance the ORR and OER Activities of a La0.5Sr0.5FeO3\u2013\u03b4 Oxygen Electrode in Reversible Solid Oxide Cells"],"prefix":"10.1021","volume":"18","author":[{"given":"Xiwen","family":"Cao","sequence":"first","affiliation":[{"name":"Jingdezhen Ceramic University , , ,","place":["Jingdezhen, China, 333403"]},{"name":"Jiangxi Vocational College of Industry & Engineering , ,","place":["Pingxiang, China, 333700"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-7419-3082","authenticated-orcid":true,"given":"Hui","family":"Yu","sequence":"additional","affiliation":[{"name":"Jingdezhen University , , ,","place":["Jingdezhen, China, 333000"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Xu","family":"Xu","sequence":"additional","affiliation":[{"name":"Jingdezhen Ceramic University , , ,","place":["Jingdezhen, China, 333403"]},{"name":"Jingdezhen Ceramic University , , ,","place":["Jingdezhen, China, 333403"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Linghong","family":"Luo","sequence":"additional","affiliation":[{"name":"Jingdezhen Ceramic University , , ,","place":["Jingdezhen, China, 333403"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Youchen","family":"Lin","sequence":"additional","affiliation":[{"name":"Shanghai Institute of Applied Physics, Chinese Academy of Sciences , , ,","place":["Shanghai, China, 201800"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Liang","family":"Cheng","sequence":"additional","affiliation":[{"name":"Jingdezhen Ceramic University , , ,","place":["Jingdezhen, China, 333403"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-9112-1219","authenticated-orcid":true,"given":"Leying","family":"Wang","sequence":"additional","affiliation":[{"name":"Jingdezhen Ceramic University , , ,","place":["Jingdezhen, China, 333403"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Bin","family":"Xiong","sequence":"additional","affiliation":[{"name":"Jingdezhen Ceramic University , , ,","place":["Jingdezhen, China, 333403"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Ziheng","family":"Yi","sequence":"additional","affiliation":[{"name":"Jingdezhen Ceramic University , , ,","place":["Jingdezhen, China, 333403"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Caiyan","family":"Cui","sequence":"additional","affiliation":[{"name":"Jiangxi Vocational College of Industry & Engineering , ,","place":["Pingxiang, China, 333700"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Zhongkun","family":"Wu","sequence":"additional","affiliation":[{"name":"Jingdezhen University , , ,","place":["Jingdezhen, China, 333000"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-5729-1361","authenticated-orcid":true,"given":"Xiaojun","family":"Zeng","sequence":"additional","affiliation":[{"name":"Jingdezhen Ceramic University , , ,","place":["Jingdezhen, China, 333403"]}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"316","published-online":{"date-parts":[[2026,10,14]]},"reference":[{"key":"2026102802073079600_cit1","doi-asserted-by":"publisher","DOI":"10.1016\/j.cej.2025.159587","article-title":"Mutual dissolution and exsolution enables superior coking resistance of cermet fuel electrode","volume":"505","author":"Cheng","year":"2025","journal-title":"Chem. 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