A research team from the Korea Advanced Institute of Science and Technology (KAIST) has introduced a groundbreaking hydrogen production system that leverages a high-performance zinc-air battery. This innovative system addresses the challenges associated with traditional green hydrogen production methods by ensuring stable hydrogen generation while minimizing the risk of fire incidents. The team's development involves a water-splitting process utilizing a water-soluble electrolyte and a unique catalyst known as G-SHELL. This catalyst, based on a graphene-sandwiched, layered structure, consists of core-shell layers promoting oxygen evolution and hydrogen evolution processes. The 3D hollow form of G-SHELL accelerates ion transport, while graphene layers enhance electron channels for efficient reactions. The use of a rechargeable zinc-air battery to power the water-splitting system is a key feature of the innovation. This battery exhibits impressive efficiency across multiple reactions, converting air into hydroxides during discharge and producing oxygen during charge. The system's designed catalyst within the air battery boasts high energy density and maintains long-term stability with a notable output. The implications of this research extend to the realm of sustainable energy storage and green hydrogen production. The environmentally friendly aspects of the zinc-air battery, such as its water-soluble electrolyte and fireproof properties, position it as a promising solution for the future. The system's publication in the journal Advanced Science underscores its potential as a next-generation energy storage device, marking a significant advancement in the pursuit of efficient and safe hydrogen production.