Researchers at Oregon State University have developed a new photocatalyst using metal-organic frameworks that produces hydrogen from water using sunlight. The BVR-19 material relies on organic sulfur components rather than expensive metal atoms, offering a path toward cheaper green hydrogen production.
Led by Kyriakos Stylianou at the Oregon State University College of Science, a team of scientists created a light-sensitive material designed to generate hydrogen directly from water at high speeds and efficiencies. Clean energy researchers have unveiled a solar-to-fuel conversion process that sidesteps both traditional solar panels and costly metal catalysts.
While splitting water with a catalyst offers an alternative to fossil fuels, current water-splitting methods often rely on electrocatalysis, which requires an external electricity source and dependable renewable power to remain sustainable. Hydrogen serves as a fuel for vehicle fuel cells and plays a part in manufacturing ammonia, refining metals, and producing plastics.
Metal-Organic Framework BVR-19 Captures Light
Chemistry researchers have synthesized nearly 100,000 different MOFs to date, with the properties of roughly another half-million predicted theoretically. The newly introduced BVR-19 photocatalyst belongs to a class of crystalline, porous compounds known as metal-organic frameworks, or MOFs. These materials consist of positively charged metal ions surrounded by organic linker molecules, featuring adjustable structures and tiny pores that can be customized for specific chemical tasks.
BVR-19 stands out because of a distinct structural element: a sulfide-to-sulfide bond that undergoes transient cleavage upon light exposure, creating reactive sulfur species.
The organic component does the important work, instead of relying primarily on the metal atoms, our material uses its sulfur-containing organic building blocks to capture light energy and move electrons where they are needed to produce hydrogen. This represents a different way of thinking about how these materials should be designed.
BVR-19 forms spontaneously in aqueous solutions at room temperature, giving it an energy advantage during synthesis. This organic-driven electron transfer eliminates the need for an additional expensive metal catalyst, simplifying the overall design of solar-driven hydrogen systems.
Comparing the Cost of Natural Gas and Green Hydrogen
Methane-steam reforming currently produces hydrogen at a cost of about $1.50 per kilogram. The industrial method for obtaining hydrogen relies on methane-steam reforming, a process that derives the gas from natural gas while emitting carbon dioxide.
The OSU team’s method aims to bridge that financial gap by demonstrating a simplified material structure that requires no outside power source beyond sunlight. By comparison, producing renewable green hydrogen typically costs approximately $5 per kilogram.
The research effort involved members of the university’s MaD Lab alongside backing from the Murdock Charitable Trust, the National Science Foundation, and the OSU College of Science. The findings were published in the Journal of the American Chemical Society.
