The Kirkendall Effect: A Critical Warning for SOEC Researchers and Manufacturers Assessing Long-Term Cell Reliability Solid Oxide Electrolysis Cells (SOECs) are often hailed as the future of sustainable hydrogen production and large-scale energy storage. As the technology rapidly evolves, so too does the dialogue around cell longevity and reliability. However, as much of the field rushes to publish performance metrics and claim stability, a fundamental materials reality is too often overlooke...