A new solar-radiation-concentrating device produces “green” hydrogen at a rate of more than 2 kilowatts while maintaining efficiencies above 20%. The pilot-scale device, which is already operational under real sunlight conditions, also produces usable heat and oxygen, and its developers at the École polytechnique fédérale de Lausanne (EPFL) in Switzerland say it could be commercialized in the near future.
The new system sits on a concrete foundation on the EPFL campus and consists of a parabolic dish seven metres in diameter. This dish collects sunlight over a total area of 38.5 m2, concentrates it by a factor of about 1000 and directs it onto a reactor that comprises both photovoltaic and electrolysis components. Energy from the concentrated sunlight generates electron-hole pairs in the photovoltaic material, which the system then separates and transports to the integrated electrolysis system. Here, the energy is used to “split” water that is pumped through the system at an optimal rate, producing both oxygen and hydrogen.
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