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Unlike chemical looping combustion, CO2-splitting is predominantly conducted using iron-based oxygen carriers (OCs) due to thermodynamic constraints. However, the phase transformation of iron\/iron oxide often leads to severe sintering within a few cycles. To mitigate this issue, we incorporated alkaline earth metals (magnesium, calcium, and strontium) into iron oxide OCs. Among these, the strontium-incorporated iron oxygen carrier, prepared with molecular-level mixing, demonstrated superior dispersion and anti-sintering properties. It evolved into a mixture of strontium ferrate and strontium-doped iron oxide. The strontium ferrate particles became stable spacers that separated the strontium-doped iron oxide particles from severe sintering, allowing for reversible transitions between wustite (FeO) and magnetite (Fe3O4). Consequently, the Sr-modified OC sustained stable performance over 100 cycles of chemical looping CO2-splitting coupled with ethane cracking at 700 \u00b0C. In contrast, magnesium- and calcium-incorporated samples formed large single-phase oxide materials that were either inactive toward CO2-splitting or exhibited slow kinetics due to inhibited ion diffusion through the crystal lattice.<\/jats:p>","DOI":"10.1021\/acsami.6c14147","type":"journal-article","created":{"date-parts":[[2026,9,2]],"date-time":"2026-09-02T04:50:26Z","timestamp":1788324626000},"page":"47754-47763","source":"Crossref","is-referenced-by-count":0,"title":["Enabling Stable Chemical Looping CO2-Splitting with Strontium Ferrate-Spaced Structurally Reversible Strontium-Doped Iron Oxygen Carriers"],"prefix":"10.1021","volume":"18","author":[{"given":"Chun-I","family":"Chou","sequence":"first","affiliation":[{"name":"National Tsing Hua University , , 101 Sec. 2, Kuang-Fu Rd. , ,","place":["Hsinchu, Taiwan, 300044"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Tzu-Hao","family":"Hung","sequence":"additional","affiliation":[{"name":"National Tsing Hua University , , 101 Sec. 2, Kuang-Fu Rd. , ,","place":["Hsinchu, Taiwan, 300044"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Yu-Chen","family":"Chien","sequence":"additional","affiliation":[{"name":"National Tsing Hua University , , 101 Sec. 2, Kuang-Fu Rd. , ,","place":["Hsinchu, Taiwan, 300044"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-7735-673X","authenticated-orcid":true,"given":"Yung-Tin (Frank)","family":"Pan","sequence":"additional","affiliation":[{"name":"National Tsing Hua University , , 101 Sec. 2, Kuang-Fu Rd. , ,","place":["Hsinchu, Taiwan, 300044"]}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"316","published-online":{"date-parts":[[2026,8,28]]},"reference":[{"issue":"1","key":"2026092217065456900_cit1","doi-asserted-by":"publisher","DOI":"10.1155\/2009\/710515","article-title":"Advancements in Development of Chemical-Looping Combustion: A Review","volume":"2009","author":"Fang","year":"2009","journal-title":"Int. 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