H2SON. Improved SOEC electrolysis cells by implementing ceramic nanoparticles for efficient renewable hydrogen production

The H2SON project aims to enhance the efficiency of solid oxide electrolysis cells (SOECs) for green hydrogen production by addressing challenges related to durability, scalability, and cost reduction. To achieve this, the project will optimize the formulations and deposition methods used in cell manufacturing, reducing the thickness of functional layers to improve efficiency and minimize material consumption. Additionally, efforts will focus on densifying the barrier layer that separates the air electrode from the electrolyte, preventing undesired reactions through innovative and scalable techniques such as spray coating and the incorporation of nanoparticles.

Another key aspect of the project is the development of enhanced air electrodes, utilizing advanced catalytic nanoparticles to increase the reaction surface area and improve performance without requiring tedious infiltration and calcination cycles. To achieve this, the project will employ Flame Spray Pyrolysis (FSP) technology for nanoparticle production and work on surface functionalization to facilitate their integration into the inks. H2SON is the result of a collaboration between the Hydrogen Area of CENER, an expert in SOEC technology, and Lurederra, a research center specializing in nanoparticle synthesis via FSP and the development of active layers through spray coating.

CENER leads the optimization of SOEC cell manufacturing processes, the development of high-performance cells, and the overall coordination of the project. First, it is responsible for studying and comparing different cell configurations, optimizing the production of their layers using scalable techniques such as tape casting and screen printing, with the goal of reducing costs and improving electrochemical efficiency. Additionally, CENER will formulate inks with nanoparticles of various materials and study their application by screen printing, aiming for greater densification of barrier layer and improved catalytic activity of the air electrode. Building on these advancements, CENER leads the manufacturing and electrochemical validation of improved cells, integrating the innovations developed in the project to compare their performance with conventional cells. Finally, it also takes on the overall project management, overseeing technical coordination, the quality of results, communication with the Government of Navarra, and the dissemination of progress, ensuring the proper execution and impact of the project in the hydrogen sector.