The article discusses the development of a novel metal-free semiconductor, the nonstoichiometric β-ketoenamine-linked Tp-Py-COF, as an efficient photocatalyst for hydrogen production. Unlike traditional methods relying on noble metal-based cocatalysts, this photocatalyst demonstrated effective sacrificial hydrogen production from both water and seawater. It outperformed platinum-modified COFs and metal-containing inorganic photocatalysts without the need for additional cocatalysts, showcasing the potential for cost-effective and scalable hydrogen production. The study emphasized the active role of carbonyl groups within the structure for proton reduction, contributing to enhanced light absorption and charge separation. Characterization techniques such as PXRD, FTIR, NMR, and XPS confirmed the material's crystalline structure, chemical composition, surface area, thermal stability, and morphology. This innovative approach presents a promising direction in the field of solar-to-chemical conversion and renewable energy, offering a more sustainable and efficient solution for hydrogen production.