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FeSO4\u00b77H2O is used as the precursor, and sodium dodecyl sulfate (SDS) is incorporated as a dispersing agent to optimize particle size and dispersion. The SDS concentration plays a crucial role in controlling the particle size and distribution, with higher SDS concentrations resulting in smaller, well-dispersed particles (30\u201340 nm), compared to the agglomerated particles formed without SDS. The Fe3O4 catalyst demonstrates significant enhancement in ORR performance, with a half-wave potential of 0.091 V vs. Hg\/HgO and a limiting diffusion current density of \u22125.50 mA cm2, surpassing the performance of agglomerated Fe3O4 and approaching that of state-of-the-art 20% Pt\/C catalysts. Additionally, the Fe3O4 catalyst exhibits superior stability and resistance to methanol and CO poisoning, presenting a promising alternative to platinum-based catalysts for ORR applications. This work introduces an efficient approach for the synthesis of high-performance and evenly distributed Fe3O4 electrocatalysts, offering a new pathway for the development of metal oxide-based ORR catalysts with enhanced activity and durability.<\/jats:p>","DOI":"10.3390\/molecules30081753","type":"journal-article","created":{"date-parts":[[2025,4,14]],"date-time":"2025-04-14T09:06:51Z","timestamp":1744621611000},"page":"1753","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":11,"title":["Nanoscale Fe3O4 Electrocatalysts for Oxygen Reduction Reaction"],"prefix":"10.3390","volume":"30","author":[{"ORCID":"https:\/\/orcid.org\/0009-0008-8483-8914","authenticated-orcid":false,"given":"Junjie","family":"Zhang","sequence":"first","affiliation":[{"name":"Aerospace Vehicle Power Engineering, Institute of Aeronautical Engineering, Civil Aviation Flight University of China, Tianfu Campus, Chengdu 618000, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jilong","family":"Wang","sequence":"additional","affiliation":[{"name":"Aerospace Vehicle Power Engineering, Institute of Aeronautical Engineering, Civil Aviation Flight University of China, Tianfu Campus, Chengdu 618000, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Yaoming","family":"Fu","sequence":"additional","affiliation":[{"name":"Aerospace Vehicle Power Engineering, Institute of Aeronautical Engineering, Civil Aviation Flight University of China, Tianfu Campus, Chengdu 618000, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Xing","family":"Peng","sequence":"additional","affiliation":[{"name":"Aerospace Vehicle Power Engineering, Institute of Aeronautical Engineering, Civil Aviation Flight University of China, Tianfu Campus, Chengdu 618000, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Maosong","family":"Xia","sequence":"additional","affiliation":[{"name":"Aerospace Vehicle Power Engineering, Institute of Aeronautical Engineering, Civil Aviation Flight University of China, Tianfu Campus, Chengdu 618000, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Weidong","family":"Peng","sequence":"additional","affiliation":[{"name":"Aerospace Vehicle Power Engineering, Institute of Aeronautical Engineering, Civil Aviation Flight University of China, Tianfu Campus, Chengdu 618000, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Yaowei","family":"Liang","sequence":"additional","affiliation":[{"name":"Department of Mechanical & Industrial Engineering, University of Toronto, Toronto, ON M5S 2E8, Canada"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Wuguo","family":"Wei","sequence":"additional","affiliation":[{"name":"Aerospace Vehicle Power Engineering, Institute of Aeronautical Engineering, Civil Aviation Flight University of China, Tianfu Campus, Chengdu 618000, China"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"1968","published-online":{"date-parts":[[2025,4,14]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"1805617","DOI":"10.1002\/adma.201805617","article-title":"Alloy Nanocatalysts for the Electrochemical Oxygen Reduction (ORR) and the Direct Electrochemical Carbon Dioxide Reduction Reaction (CO2RR)","volume":"31","author":"Kim","year":"2019","journal-title":"Adv. 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