A 4 × 4 cm² Nanoengineered Solid Oxide Electrolysis Cell for Efficient and Durable Hydrogen Production

Area of Science:

• Electrochemistry
• Materials Science
• Energy Conversion

Background:

• High-temperature solid oxide electrolysis cells (SOECs) offer advantages but suffer from poor long-term durability, hindering commercialization.
• Current SOEC technology faces challenges with electrode degradation, limiting operational lifespan and efficiency.

Purpose of the Study:

• To address the long-term durability challenge in SOECs by developing nanoengineered electrodes.
• To improve the performance and stability of SOECs for efficient steam electrolysis.

Main Methods:

• Fabrication of a nanoengineered O2 electrode using a La0.6Sr0.4CoO3-δ (LSC) and Gd,Pr-co-doped CeO2 (CGPO) nanocomposite on a CGO scaffold.
• Modification of a Ni/yttria stabilized zirconia (YSZ) H2 electrode with a nanogranular CGO coating.
• Testing of a 4 × 4 cm2 SOEC with nanoengineered electrodes under steam electrolysis conditions at 750 °C.

Main Results:

• The nanoengineered SOEC achieved a current density over 1.2 A cm-2 at 1.3 V and 750 °C.
• Demonstrated excellent long-term durability at 1 A cm-2 with a steam-to-hydrogen conversion of approximately 56%.
• Identified degradation mechanisms of conventional Ni/YSZ electrodes and showed mitigation strategies with the nanoengineered design.

Conclusions:

• Nanoengineering electrodes through infiltration is a viable strategy for designing robust SOECs.
• The developed nanoengineered electrodes significantly improve SOEC durability and performance.
• These findings have major implications for the practical integration of SOEC technology in sustainable energy systems.