Green hydrogen, produced through water electrolysis, is a promising eco-friendly energy source. Researchers in Korea at the Korea Research Institute of Standards and Science have made significant advancements in green hydrogen production by developing a new material that enhances efficiency and reduces costs. The newly developed catalyst, a high-performance base metal catalyst, is more cost-effective than precious metal-based alternatives and demonstrates superior performance, marking a significant step towards the commercialization of green hydrogen. By introducing ruthenium nanoparticles on molybdenum dioxide, the catalyst offers enhanced durability and activity, outperforming existing commercial materials. Integration with a perovskite-silicon solar cell resulted in a remarkable solar-to-hydrogen efficiency of 22.8%, highlighting its compatibility with renewable energy sources. Additionally, the catalyst showed high activity and stability in saline water, potentially reducing desalination costs. The research, published in a leading journal, paves the way for a more sustainable and cost-effective green hydrogen era.