Fraunhofer Institute Develops 31.3% Efficient Solar Hydrogen Module

en.Wedoany.com Reported - German researchers at the Fraunhofer Institute for Solar Energy Systems (ISE) have developed a solar module capable of converting up to 31.3% of incident sunlight directly into hydrogen, offering a new technological pathway for the commercial production of clean fuel.

In this project, scientists directly coupled concentrating photovoltaic cells with a proton exchange membrane (PEM) electrolyzer, eliminating intermediate power conversion steps and enabling direct use of electricity generated by solar cells for water splitting. Dr. Frank Dimroth, head of the III-V Photovoltaics and Concentrator Technology department at the institute, stated that this record demonstrates hydrogen can be produced very efficiently directly from sunlight.

Project leader Dr. Juan Francisco Martínez Sánchez explained that the system relies on concentrating photovoltaics (PVs) technology. Direct sunlight is focused through an array of Fresnel lenses onto highly efficient III-V multi-junction solar cells, which generate an open-circuit voltage exceeding 4 volts.

Researchers connected these solar cells directly to the cathode and anode of two series-connected PEM electrolyzers, precisely matching the electrical characteristics of both technologies. Dr. Tom Smolinka, head of the Membrane Electrolysis department at the institute, noted that this design achieves a perfect match of electrical characteristics, with electricity transmitted directly to hydrogen production without intermediate conversion stages or energy losses.

The proof-of-concept demonstrator has a lens area of approximately 64 square centimeters (9.92 square inches). In outdoor field tests, the demonstrator converted about 31.3% of incident solar energy into chemical energy stored in hydrogen, based on the fuel's higher heating value. The III-V solar cells used in this technology are considered the world's most efficient photovoltaic devices and have long been used in spacecraft applications.

Researchers believe that concentrating photovoltaic systems may make them economically viable for terrestrial applications, and these results demonstrate the potential of integrated photovoltaic-electrolysis systems for efficient green hydrogen production. However, Dr. Dimroth noted that the technology remains in early development stages, and it is currently difficult to predict when a competitive system might be achieved. The team is currently seeking investors for the planned spin-off company Clearsun Energy to advance commercialization of the technology.

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