The primary objective of this project is to reduce the cost of green hydrogen by developing cost-effective organic porous framework-based electrocatalysts that utilize plastic waste as a source of organic linkers, providing a viable alternative to scarce and expensive noble metals. In situ/operando analyses will be employed to gain in-depth insights into the catalytic mechanisms, thereby guiding the rational design of next-generation catalysts. The research will further shift from freshwater to natural seawater electrolysis, with a particular focus on developing corrosion-resistant electrocatalysts capable of maintaining high activity and durability under seawater conditions.