An international collaboration between researchers from Seoul National University, Korea Institute of Science and Technology (KIST), and Kookmin University resulted in the development of an advanced electrochemical catalyst with a ruthenium core-shell structure. Published in Energy & Environmental Science, the research led by Professor Jin Young Kim showcased a catalyst that demonstrated exceptional performance and stability in large-scale water electrolysis equipment testing, offering promise for commercial applications. The catalyst's efficiency in hydrogen evolution reaction surpassed platinum by 4.4 times, setting a new benchmark for hydrogen production. By using minimal precious metals in a nanocluster structure, the team achieved improved performance and stability, with potential cost reductions. The catalyst's core-shell design, optimized foam electrode structure, and unique composition make it a strong candidate for next-generation water electrolysis technology, with implications for hydrogen fuel cells and industrial hydrogen applications. Dr. Hyun Woo Lim, the study's first author, is working on commercializing this technology and was recognized under the Sejong Fellowship Program for his contributions. The study's findings represent a technological breakthrough in advancing hydrogen production towards carbon-neutral energy systems, with significant implications for sustainable energy.