文章基本信息

标题：Exergy valorization of a water electrolyzer and CO2 hydrogenation tandem system for hydrogen and methane production
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作者：Omar S. Mendoza-Hernandez ; Asuka Shima ; Hiroshige Matsumoto 等
期刊名称：Scientific Reports
电子版ISSN：2045-2322
出版年度：2019
卷号：9
期号：1
页码：1-8
DOI：10.1038/s41598-019-42814-6
出版社：Springer Nature
摘要：In this work, we introduce a water electrolysis and CO 2 hydrogenation tandem system which focuses on methane generation. The concept consists of a water electrolyzer thermally coupled to a CO 2 hydrogenation reactor, where the power required to generate hydrogen comes from renewable energy. A thermodynamic analysis of the tandem system was carried out. Our analysis exposes that it is possible to increase the exergy efficiency of the water electrolyzer and CO 2 hydrogenation system by thermal coupling, where the thermal energy required to split water into H 2 and O 2 during the electrolysis process is compensated by the heat generated during the CO 2 hydrogenation reaction. Here, the conditions at which high exergy efficiency can be achieved were identified.