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Herein, we synthesized twelve perovskite oxide\u2010based catalysts for the oxygen evolution reaction (OER) in alkaline media. The catalysts are based on the parent oxide perovskite Ba<jats:sub>0.5<\/jats:sub>Gd<jats:sub>0.8<\/jats:sub>La<jats:sub>0.7<\/jats:sub>Co<jats:sub>2<\/jats:sub>O<jats:sub>6\u2010\u03b4<\/jats:sub> (BGLC587) and are synthesized through the sol\u2010gel citrate synthesis route. To reduce the demand on cobalt (Co), but also increase the intrinsic catalytic activity of BGLC587 for the OER, we substitute Co on the B\u2010site with certain amounts of Fe and Ni, synthesizing catalysts of the general formula Ba<jats:sub>0.5<\/jats:sub>Gd<jats:sub>0.8<\/jats:sub>La<jats:sub>0.7<\/jats:sub>Co<jats:sub>2\u2010x\u2010y<\/jats:sub>Fe<jats:sub>x<\/jats:sub>Ni<jats:sub>y<\/jats:sub>O<jats:sub>6\u2010\u03b4<\/jats:sub>. A plethora of physicochemical and electrochemical methods suggest that an Fe content between 30\u2009% and 70\u2009% increases the intrinsic catalytic activity of BGLC587, while Tafel slopes in combination with in\u2010situ Raman spectroscopy suggest the rate determining step is likely a proton\u2010exchange reaction, progressing possibly through the lattice oxygen mechanism (LOM). We apply one of the optimized, Co\u2010substituted perovskites in a monolithic, photovoltaic (PV)\u2010driven electrolysis cell and we achieve an initial solar\u2010to\u2010hydrogen (STH) conversion efficiency of 10.5\u2009% under one sun solar simulated illumination.<\/jats:p>","DOI":"10.1002\/cssc.202401403","type":"journal-article","created":{"date-parts":[[2024,9,19]],"date-time":"2024-09-19T05:20:44Z","timestamp":1726723244000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Iron and Nickel Substituted Perovskite Cobaltites for Sustainable Oxygen Evolving Anodes in Alkaline Environment"],"prefix":"10.1002","volume":"18","author":[{"given":"Henrik","family":"Petlund","sequence":"first","affiliation":[{"name":"Department of Chemistry, Centre for Materials Science and Nanotechnology University of Oslo  Gaustadall\u00e9en 21, NO-0349 Oslo, Norway"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-3008-9774","authenticated-orcid":false,"given":"Alaa","family":"Faid","sequence":"additional","affiliation":[{"name":"Department of Materials Science and Engineering Norwegian University of Science and Technology (NTNU)  NO-7491 Trondheim Norway"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-7088-9528","authenticated-orcid":false,"given":"Junjie","family":"Zhu","sequence":"additional","affiliation":[{"name":"Institute for Energy Technology (IFE), NO-2007  Kjeller Norway"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-7457-8839","authenticated-orcid":false,"given":"Anuj","family":"Pokle","sequence":"additional","affiliation":[{"name":"Department of Physics, Centre for Materials Science and Nanotechnology University of Oslo  POB 1048, NO-0316 Oslo Norway"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-0909-0439","authenticated-orcid":false,"given":"Truls","family":"Norby","sequence":"additional","affiliation":[{"name":"Department of Chemistry, Centre for Materials Science and Nanotechnology University of Oslo  Gaustadall\u00e9en 21, NO-0349 Oslo, Norway"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-3711-8822","authenticated-orcid":false,"given":"Svein","family":"Sunde","sequence":"additional","affiliation":[{"name":"Department of Materials Science and Engineering Norwegian University of Science and Technology (NTNU)  NO-7491 Trondheim Norway"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-7193-3236","authenticated-orcid":false,"given":"Athanasios","family":"Chatzitakis","sequence":"additional","affiliation":[{"name":"Department of Chemistry, Centre for Materials Science and Nanotechnology University of Oslo  Gaustadall\u00e9en 21, NO-0349 Oslo, Norway"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"311","published-online":{"date-parts":[[2024,11,4]]},"reference":[{"key":"e_1_2_8_1_1","doi-asserted-by":"publisher","DOI":"10.1039\/C6CS00328A"},{"key":"e_1_2_8_2_1","doi-asserted-by":"publisher","DOI":"10.1002\/anie.202216477"},{"key":"e_1_2_8_3_1","doi-asserted-by":"publisher","DOI":"10.1021\/acs.jpclett.2c03336"},{"key":"e_1_2_8_4_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.nanoen.2020.105514"},{"key":"e_1_2_8_5_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.jclepro.2021.128544"},{"key":"e_1_2_8_6_1","doi-asserted-by":"publisher","DOI":"10.1002\/cssc.202301534"},{"key":"e_1_2_8_7_1","doi-asserted-by":"publisher","DOI":"10.1002\/cssc.201902138"},{"key":"e_1_2_8_8_1","doi-asserted-by":"publisher","DOI":"10.1126\/science.1212858"},{"key":"e_1_2_8_9_1","doi-asserted-by":"publisher","DOI":"10.1039\/C9CC08765F"},{"key":"e_1_2_8_10_1","doi-asserted-by":"publisher","DOI":"10.1039\/D0TA09756J"},{"key":"e_1_2_8_11_1","doi-asserted-by":"publisher","DOI":"10.1021\/acsami.1c01900"},{"key":"e_1_2_8_12_1","unstructured":"H.\u2005L. 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