 Valorization of the by-product oxygen from green hydrogen production: A reviewFlorentin Eckl, Ana Moita, Rui Castro and Rui Costa Neto Applied Energy, 2025, vol. 378, issue PA, No S0306261924022001 Abstract: Green hydrogen is regarded as an important pillar in the sustainable energy system of the future. With a constantly increasing speed, new projects of every scale are producing the gas all over the world. Though, the process of electrolysis produces not only hydrogen but eight-times the amount of oxygen. Oxygen is crucial in many applications, however, the majority of the current green hydrogen projects neglect the value of the by-product. In this article, the state-of-the-art of different oxygen production technologies and the usage in today's economy are reviewed. Current studies and projects focusing on the usage of oxygen from electrolysis as well as an outlook on possible developments are presented. It demonstrates the advantages of the utilization of electrolytic oxygen and the increasing interest from governments and industry. A transition from traditional oxygen supply through cryogenic distillation and swing adsorption to electrolytic O2 can be expected in various cases. Keywords: Electrolytic oxygen; Oxygen industry; Hydrogen/oxygen co-production; Power-to-gas; Oxygen production (search for similar items in EconPapers) Downloads: (external link) Related works: Export reference: BibTeX RIS (EndNote, ProCite, RefMan) HTML/Text Persistent link: https://EconPapers.repec.org/RePEc:eee:appene:v:378:y:2025:i:pa:s0306261924022001 Ordering information: This journal article can be ordered from DOI: 10.1016/j.apenergy.2024.124817 Access Statistics for this article Applied Energy is currently edited by J. Yan More articles in Applied Energy from Elsevier |
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