Solid oxide electrolysis cell (SOEC) technology is highly efficient in producing clean hydrogen, but electrode delamination remains a significant issue. Recent studies have utilized advanced transmission electron microscopy (TEM) and density functional theory (DFT) to investigate the causes of electrode delamination, focusing on nanoscale interface degradation. Researchers at the Korea Institute of Science and Technology have elucidated the degradation mechanism at the nanoscale level, identifying the initial changes in electrolysis cell materials. They found that oxygen ions accumulating at the Yttria Stabilized Zirconia (YSZ) interface during the oxygen injection process led to compressed atomic structure, nanoscale defects, and cracks, ultimately reducing cell performance. The study, published in Energy & Environmental Science, marks the first to uncover the nanoscale degradation mechanism, offering insights to address performance decline and enhance durability for extended high-temperature operation above 600°C. The research team aims to collaborate with manufacturers to automate production processes, develop new materials to suppress oxygen ion accumulation, improve production efficiency, and reduce costs, ultimately advancing the economic viability of clean hydrogen production. Dr. Chang from KIST highlighted the significance of the findings in improving the durability and production efficiency of high-temperature electrolysis cells, contributing to the economic feasibility of clean hydrogen production.