Journal
ENERGY CONVERSION AND MANAGEMENT
Volume 237, Issue -, Pages -Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.enconman.2021.114106
Keywords
Techno-economic analysis; Hydrogen; Electrolysis; High-temperature; High-pressure
Categories
Funding
- Natural Sciences and Engineering Research Council [CRDPJ 505345-16]
- Western Economic Diversification Canada [WDP14354]
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The study analyzed the economics of water electrolysis under high temperature and pressure conditions, finding that the lowest cost and energy consumption for hydrogen occurred at 270-310°C and 700 bar. There is a trade-off between improved kinetics at higher temperatures and increased operating costs due to high water activities.
Green hydrogen demand will increase in the coming decades, and water electrolysis can enable low- or zerocarbon production pathways. High-temperature and pressure operation can improve electrode kinetics and reduce compression requirements. In this work, the economics of water electrolysis were analyzed under these conditions by making an electrochemical model. The energy consumption was calculated to obtain the levelized cost of hydrogen under varying temperature, pressure, and catalyst performance. The lowest cost and energy requirements occurred at 270?310 ?C and 700 bar. Our results illustrate a trade-off between improved kinetics at higher temperatures and increased operating costs due to high water activities. With performance similar to the best available measurements, operation under high temperature and pressure was competitive if electrolyzer system costs are less than 25% higher than their low-temperature counterparts.
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