Abstract
Considerable research has been done by many groups for the creation of standalone, integrated, solar-driven, photoelectrochemical water splitting devices that generate hydrogen using only energy from the sun. However, stability of these devices in the electrolytes needed for the efficient operation of the oxidation catalysts remains a significant challenge for long-term operation. Here, we demonstrate an integrated and truly wireless device for solar water splitting. This device integrates an oxygen evolution reaction (OER) catalyst and a hydrogen evolution reaction (HER) catalyst on a commercially available triple-junction, silicon-based solar cell. Integrated into this system is a transparent polymer coating that allows the solar cell to remain stable under alkaline conditions for over 100 hours of constant operation with one sun (1000 W/m2) illumination. This work also addresses the challenges involved with integrating an earth-abundant metal oxide catalyst on the light absorbing oxidation side of the solar cell, as well as the integration of a low-PGM loaded HER catalyst on the reduction side.
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