Researchers at KAIST have introduced a groundbreaking hydrogen production system that addresses challenges in green hydrogen generation. The system utilizes a water-splitting process with an aqueous electrolyte, enhancing safety and stability in hydrogen production. Led by Professor Jeung Ku Kang, the team developed a self-sustaining system powered by a high-efficiency zinc-air battery, significantly advancing the field of green hydrogen technology. The study introduces a novel catalyst material called G-SHELL, effective for three catalytic reactions, thereby improving energy density and stability. By integrating this material into the zinc-air battery, the team achieved remarkable energy density, power characteristics, and long-term stability, surpassing conventional batteries. This innovation paves the way for a next-generation energy storage device that offers a sustainable approach to hydrogen production. The system's ability to operate without fire hazards and its potential to be combined with water electrolysis systems mark a significant step towards environmentally friendly hydrogen production. The research, conducted by a team including PhD Candidate Dong-Won Kim and Master's Student Jihoon Kim, received support from Korean research programs. The findings, published in Advanced Science, demonstrate a new breakthrough in green hydrogen production, showcasing the potential of KAIST's innovative approach to sustainable energy solutions.