| About this Abstract |
| Meeting |
MS&T24: Materials Science & Technology
|
| Symposium
|
Advances in Materials and Systems for a Hydrogen Economy
|
| Presentation Title |
Ferritic Interconnect Materials in SOEC – Challenges and Degradation from Ambient Temperature to 900°C |
| Author(s) |
David Kniep, Mario Rudolphi, Mathias Galetz |
| On-Site Speaker (Planned) |
David Kniep |
| Abstract Scope |
Hydrogen production with solid oxide electrolysis cells (SOECs) is gaining significance in today’s energy landscape and long-term operation is a key requirement. Hence, fundamental understanding of degradation mechanisms is mandatory, to assess lifetime and define service intervals. In ambient conditions, hydrogen can quickly diffuse through the ferritic bcc lattice causing hydrogen embrittlement of the interconnects, thus reducing the rupture strain and ultimate tensile strength. At elevated temperatures of up to 900°C, ferritic steels show increased oxidative attack in water vapor containing atmospheres while no oxide scale is formed in reducing hydrogen-rich environment. Furthermore, interdiffusion with contacting materials such as nickel mesh may alter the microstructure. This study provides an overview of various damage mechanisms involved in operation of SOEC systems and allows improved lifetime assessment. |