Solid oxide electrolyzer cells (SOECs) operate at high temperatures and are particularly efficient. The commissioning of the pilot production line marks a milestone on the path to market readiness, which the project partners report they have reached on schedule. Initially, the SOEC pilot facility will produce stacks in small quantities, with a targeted annual production capacity of 8 MW. The insights gained from the pilot line will later be transferred to large-scale manufacturing.
The agreement for the joint project was signed by Thyssenkrupp Nucera and Fraunhofer IKTS in March 2024. The goal is to develop large-scale, high-efficiency high-temperature electrolyzers for industrial applications.
Robust electrolysis technology for industrial useThe SOEC stack technology is based on an oxygen-conducting ceramic electrolyte substrate with two electrodes and coupling elements known as chromium-iron (CF) interconnectors. Cells and interconnectors are assembled into stacks. The SOEC technology is particularly corrosion-resistant and can withstand thermal cycling. It is also highly efficient and capable of integrating heat from external sources. A further advantage in manufacturing is that it requires fewer components than currently common electrolysis technologies. This makes the SOEC cell design well-suited for highly automated mass production at competitive costs.
The high efficiency of the system stems from the fact that less electrical energy is required to split steam at elevated temperatures. This is especially beneficial in settings where large amounts of high-temperature waste heat are available, such as in the steel industry. According to the press release, electricity demand can be reduced by 20% to 30% compared to other technologies.
In industrial processes where CO₂ is also generated, it can be combined with green hydrogen to produce synthesis gas. Synthesis gas is a key feedstock for the chemical industry and for e-fuels. This capability is a unique feature of SOEC technology.
