Abstract
Photocatalytic hydrogen production by water splitting is considered one of the most promising green hydrogen manufacturing technologies, but the actual outdoor deployment of this technology is limited by the availability of water feedstocks in geographical locations. An integrated device consisting of a photocatalytic layer and an atmospheric water harvesting material that can achieve in-situ photocatalytic water vapor splitting for hydrogen production by spontaneously capturing moisture from the air as a water feedstock is proposed herein. The integrated system has excellent photocatalytic and photothermal synergistic ability, low hydrogen diffusion resistance by interfacial photocatalysis, and high stability by isolating salts contamination. The system can achieve a hydrogen production rate of 425.4 μmol g−1 h−1 and a water vapor supply rate of 0.121 kg m−2 h−1 under one sun illumination, and has a water vapor adsorption rate of 0.03 kg m−2 h−1 under dark conditions in the laboratory. Furthermore, this hybrid device obtains a total hydrogen production of up to 3963.1 μmol g−1 in the real outdoor daytime and accomplishes water regeneration within 10 hours by capturing environmental moisture at night. This work provides a suitable solution for hydrogen production in areas with water scarcity or drought.
Published Version
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