Yoon, Kyung Joong Lee, Sanghoon Park, Sun Young Minh, Nguyen Q. 2025-06-23T07:00:11Z 2025-06-23T07:00:11Z 2025-06-23 2025-11 0079-6425 https://pubs.kist.re.kr/handle/201004/152662 Solid oxide electrolysis cells (SOECs) are solid-state electrochemical devices that convert electrical energy into chemical energy in the form of H2, CO, and O2 at 500-1000 degrees C. In recent years, interest in SOECs has soared because they offer extremely efficient and versatile means of producing green hydrogen and chemicals. However, SOEC technology requires further advancements for its successful commercialization. This review aims to comprehensively analyze the entirety of SOEC technology, identifying critical challenges and guiding future research. It covers both technical and economic aspects of all functional units in SOECs, including cells, stacks, and systems, with a particular emphasis on the unique characteristics of high-temperature materials. It clarifies the nano-, micro-, and macroscale phenomena, offering insights into their distinct electrochemical properties and degradation behavior. This paper encompasses both oxygen ionand proton-conducting SOECs, with a particular focus on materials-related challenges in newly developed protonic ceramics. As for economic perspectives, the viability of further cost reduction and market penetration are discussed based on techno-economic assessments and various applications. Future research directions are outlined by defining key drivers and important areas for improvement for the wide adoption of SOEC technology and its contribution to a more sustainable, efficient energy landscape. English Pergamon Press Ltd. Advances in high-temperature solid oxide electrolysis technology for clean hydrogen and chemical production: materials, cells, stacks, systems and economics Article 10.1016/j.pmatsci.2025.101520 1 Progress in Materials Science, v.154 Progress in Materials Science 154 N scie scopus 001502942900001 2-s2.0-105006878881 Materials Science, Multidisciplinary Materials Science Review INTERMEDIATE-TEMPERATURE FUEL-CELL HIGH-PERFORMANCE CO-ELECTROLYSIS STABILIZED ZIRCONIA CERAMIC ELECTROCHEMICAL-CELLS SCANDIA-ZIRCONIA ELECTROLYTES PROTON-CONDUCTING ELECTROLYTE ACHIEVING HIGH-EFFICIENCY STEAM ELECTROLYSIS High-temperature electrolyzer Solid oxide electrolysis cell Hydrogen production Degradation Costs