Green hydrogen, generated through water electrolysis, is gaining prominence as an eco-friendly energy source. In Korea, researchers at the Korea Research Institute of Standards and Science (KRISS) have successfully developed a novel material for AEM water electrolysis, a method that allows the production of large quantities of hydrogen using cost-effective non-metallic catalysts. By introducing ruthenium nanoparticles into a molybdenum dioxide with nickel molybdenum structure, the team created a high-performance base metal catalyst that surpasses precious metal alternatives in efficiency and affordability. The catalyst's structural innovation prevents degradation, offering increased durability and activity. With an exceptional solar-to-hydrogen efficiency of 22.8% when paired with a perovskite-silicon tandem solar cell, the catalyst demonstrates strong compatibility with renewable energy sources. Notably, its stability in saline water presents opportunities for cost reduction in desalination processes. Dr. Sun Hwa Park from KRISS emphasized the potential to use seawater for green hydrogen production, aiming to lower desalination costs. This significant advancement, supported by the KRISS MPI Lab Program and collaborations with Seoul National University and the Korea Institute of Materials Science, was published in a prestigious chemical engineering journal.