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While the current interest in Solid Oxide Electrolysis (SOE) technology, including its ability to operate in reversible mode (rSOC), is undeniable, building a H2-based industry and significantly decrease the current fossil fuel consumption requires scaling up the size of SOE systems .
To support in-house development and promote partnerships on experimental evaluations of rSOC modules, the MULTISTACK platform was built over the first semester 2020 at CEA-Liten. It includes a 60 kW industrial steam generator, two 30 kW air preheaters, a 22 kW dedicated air compressor, and four reversible 30 kW DC power supplies, on top of range-appropriate sensors and actuators.
In the last years, SOLIDpower has developed a Large Stack Module (LSM) dedicated to reversible fuel cell/electrolysis operation. It integrates four of SOLIDpower's new generation stacks. Engineered and prototyped in the Swiss facilities of SOLIDpower, one LSM module has been tested at CEA-Liten on the MULTISTACK platform in Autumn 2020.
Picture of SOLIDpower’s LSM / © A.NESCI, SOLIDpower
The LSM was tested in electrolysis mode, converting about 74 kWDC of electrical power into more than 50 kg of hydrogen per day (35.5 kWhDC/kgH2). In addition, fuel utilization higher than 90% and steam conversion greater than 80% were demonstrated at the module level. The results obtained at CEA-Liten confirm the interest of the solid oxide electrolyzer technology for high efficiency hydrogen generators .
 Aicart et. al., In press, Fuel Cells (2021) Aicart, J., Wuillemin, Z., Gervasoni, B., Reynaud, D., Waeber, F., Beetschen, C., Antonetti, Y., Nesci, A., and Mougin, J. (2022) Performance evaluation of a 4-stack solid oxide module in electrolysis mode. Int. J. Hydrog. Energy, 47 (6), 3568–3579.
CEA is a French government-funded technological research organisation in four main areas: low-carbon energies, defense and security, information technologies and health technologies. A prominent player in the European Research Area, it is involved in setting up collaborative projects with many partners around the world.