Abstract
The continuous increase in greenhouse gas concentrations has manifested the impacts of climate change in all regions of the world. The development of technology for achieving carbon neutrality is now transitioning from a mere necessity to an issue of human survival. Recently, high-temperature electrolysis technology has gained significant attention as a method capable of producing clean hydrogen with high efficiency. In most regions on earth, thermal energy is cheaper than electricity. High-temperature electrolysis, which utilizes both heat and electricity simultaneously to produce hydrogen, is anticipated to be economically viable for producing clean hydrogen with minimal electrical energy. Also, high-temperature electrolysis process can be modified to accommodate CO2 gas as a reactant, allowing for simultaneous electrolysis of steam and CO2, a technique known as co-electrolysis. Utilizing low-carbon electric power in conjunction with co-electrolysis can enable the production of synthesis gas containing hydrogen and carbon monoxide (H2/CO), which can serve as a clean feed-stock for e-fuel synthesis. With this study, it has been confirmed that the existing high-temperature electrolysis 5 kW stack can be utilized for co-electrolysis reactions. Furthermore, by controlling operational conditions, it has been observed that various changes in exhaust gas composition (H2/CO/CO2) are achievable. By optimizing operational conditions, it was possible to control the composition of syn-gas to an optimal blend directly usable for Fischer-Tropsch e-fuel synthesis and methanol synthesis.
Published Version
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