A collaborative research effort led by Professor Hyungyu Jin from POSTECH and Professor Jeong Woo Han from Seoul National University has resulted in a groundbreaking development in green hydrogen production. By introducing a novel iron-based catalyst, the team has successfully more than doubled the conversion efficiency of thermochemical water splitting. This advancement addresses the current limitations of traditional metal oxides, offering a promising solution for commercial viability. Through experimental techniques and computational simulations, the researchers identified structural active sites within iron oxide materials that play a crucial role in hydrogen production at the atomic level. The study not only showcases the efficiency of the new catalyst but also emphasizes the importance of interdisciplinary collaboration between experimental and computational sciences. Professors Jin and Han highlighted the significance of this research in proposing a cost-effective and sustainable pathway for hydrogen production using readily available iron oxides and alternative heat sources. Supported by various research organizations, this work paves the way for a cleaner and more efficient energy future.