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Despite being in its infancy, significant efforts have been made in the development of high\u2010efficient materials and in understanding the fundamental processes. However, little attention has been given to device architecture and scalability, which may prove equally important in bringing this technology closer to commercialization. This work is the first attempt at upscaling SRFCs, proposing an innovative 25 cm<jats:sup>2<\/jats:sup> photoactive\u2010area device: the SolarFlow25 cell. A computational fluid dynamics model is developed to implement design key features aiming at: maximizing light absorption by the semiconductor, ensuring effective diffusion and convection of redox species, and guaranteeing minimal electronic and ionic transport resistances. After being connected to a redox flow cell (RFC), the combined SRFC\/RFC device is used to photocharge\u2013discharge a ferrocyanide\/anthraquinone (2,7\u2010AQDS) chemistry continuously. A nanostructured hematite (\u03b1\u2010Fe<jats:sub>2<\/jats:sub>O<jats:sub>3<\/jats:sub>) photoelectrode combined in series with a dye\u2010sensitized solar cell (DSSC) produces an unbiased photocurrent of \u224840\u00a0mA. The solar\u2010to\u2010output\u2010electricity\u2010efficiency remains stable at \u22480.44%, fourfold higher than any other reported hematite\u2010driven SRFC. The guidelines provided here are expected to help design and upscale future SRFC devices, making solar energy accessible in decentralized locations.<\/jats:p>","DOI":"10.1002\/aenm.202102893","type":"journal-article","created":{"date-parts":[[2021,12,11]],"date-time":"2021-12-11T00:59:28Z","timestamp":1639184368000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":19,"title":["A 25\u00a0cm<sup>2<\/sup> Solar Redox Flow Cell: Facing the Engineering Challenges of Upscaling"],"prefix":"10.1002","volume":"12","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-5623-5031","authenticated-orcid":false,"given":"Telmo","family":"da Silva Lopes","sequence":"first","affiliation":[{"name":"LEPABE \u2010 Laboratory for Process Engineering Environment Biotechnology and Energy Faculty of Engineering University of Porto  Rua Dr. Roberto Frias Porto 4200\u2010465 Portugal"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-3837-0715","authenticated-orcid":false,"given":"Paula","family":"Dias","sequence":"additional","affiliation":[{"name":"LEPABE \u2010 Laboratory for Process Engineering Environment Biotechnology and Energy Faculty of Engineering University of Porto  Rua Dr. Roberto Frias Porto 4200\u2010465 Portugal"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-0951-9813","authenticated-orcid":false,"given":"Ricardo","family":"Monteiro","sequence":"additional","affiliation":[{"name":"LEPABE \u2010 Laboratory for Process Engineering Environment Biotechnology and Energy Faculty of Engineering University of Porto  Rua Dr. Roberto Frias Porto 4200\u2010465 Portugal"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-3114-8502","authenticated-orcid":false,"given":"Ant\u00f3nio","family":"Vilanova","sequence":"additional","affiliation":[{"name":"LEPABE \u2010 Laboratory for Process Engineering Environment Biotechnology and Energy Faculty of Engineering University of Porto  Rua Dr. Roberto Frias Porto 4200\u2010465 Portugal"},{"name":"INL \u2010 International Iberian Nanotechnology Laboratory  Avenida Mestre Jos\u00e9 Veiga Braga 4715\u2010330 Portugal"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-5313-4016","authenticated-orcid":false,"given":"Dzmitry","family":"Ivanou","sequence":"additional","affiliation":[{"name":"LEPABE \u2010 Laboratory for Process Engineering Environment Biotechnology and Energy Faculty of Engineering University of Porto  Rua Dr. Roberto Frias Porto 4200\u2010465 Portugal"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-2472-3265","authenticated-orcid":false,"given":"Ad\u00e9lio","family":"Mendes","sequence":"additional","affiliation":[{"name":"LEPABE \u2010 Laboratory for Process Engineering Environment Biotechnology and Energy Faculty of Engineering University of Porto  Rua Dr. Roberto Frias Porto 4200\u2010465 Portugal"}]}],"member":"311","published-online":{"date-parts":[[2021,12,10]]},"reference":[{"key":"e_1_2_9_1_1","doi-asserted-by":"publisher","DOI":"10.1038\/495305a"},{"key":"e_1_2_9_2_1","unstructured":"European Commission Energy Roadmap 2050 https:\/\/ec.europa.eu\/energy\/sites\/ener\/files\/documents\/2012_energy_roadmap_2050_en_0.pdf(accessed: June2021)."},{"key":"e_1_2_9_3_1","doi-asserted-by":"publisher","DOI":"10.1126\/science.aad1920"},{"key":"e_1_2_9_4_1","unstructured":"BP Company BP Statistical Review of World Energy https:\/\/www.bp.com\/en\/global\/corporate\/energy-economics\/statistical-review-of-world-energy.html(accessed: June2021)."},{"key":"e_1_2_9_5_1","doi-asserted-by":"publisher","DOI":"10.1021\/cr1002326"},{"key":"e_1_2_9_6_1","doi-asserted-by":"crossref","unstructured":"N. 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