Scientists at the U.S. Department of Energy’s (DOE) National Renewable Energy Laboratory (NREL) recaptured the record for highest efficiency in solar hydrogen production via a photoelectrochemical (PEC) water-splitting process. The new solar-to-hydrogen (STH) efficiency record is 16.2%, topping a reported 14% efficiency in 2015 by an international team from Helmholtz-Zentrum Berlin, TU Ilmenau, Fraunhofer ISE and the California Institute of Technology. The record-setting PEC cell represents a significant change from the concept device Turner developed at NREL in the 1990s.
Both the old and new PEC processes employ stacks of light-absorbing tandem semiconductors that are immersed in an acid/water solution (electrolyte) w...
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