Researchers at Oregon State University have developed a photocatalyst called BVR-19, a metal-organic framework (MOF) that can produce hydrogen from water when exposed to light. Unlike conventional MOFs that rely mainly on metal atoms, BVR-19 uses its sulfur-containing organic building blocks to capture light energy and move electrons. The key is an unusual sulfide-to-sulfide bond that temporarily breaks under illumination, generating highly reactive sulfur species that drive the reaction.
The material offers practical advantages. It does not require an additional expensive metal catalyst, which could simplify the design of light-driven hydrogen systems. BVR-19 also forms spontaneously in aqueous solutions at room temperature, reducing the energy needed to manufacture it. The research team, led by Kyriakos Stylianou, says this represents a different way of thinking about how such materials should be designed.
The work appears in the Journal of the American Chemical Society. Conventional hydrogen production via methane-steam reforming costs about $1.50 per kilogram but releases carbon dioxide, while green hydrogen from water costs roughly $5 per kilogram. The researchers say their findings provide a blueprint for designing better materials that could bring down the cost of green hydrogen, making solar fuel production more practical.