Overall, these findings provide the first proof-of-concept of a full-solar spectrum powered SVG-PC device for solar fuels production and clean water production from polluted water. By integrating the complementary panchromatic solar light absorption of a UV-active photocatalyst with a broadband lightabsorbing SVG, the full solar spectrum could be utilized with minimal compromise on hydrogen and water production compared to non-integrated counterparts. Since this approach does not require the photocatalyst to make direct contact with seawater, it opens doors for the photocatalytic process to take place in a variety of feedstocks without having to modify the photocatalyst. H2 production from contaminated feedstocks via conventional photocatalytic, photoelectrochemical and photovoltaic-electrolysis systems suffer from catalyst poisoning. The designed SVG-PC device circumvents this issue, and its potential employment on a range of open-water source whether it be on a river, sea, water reservoir or industrial waste, also suggests a great potential benefit for reducing land use competition and lower the cost for water purification in the energy production as well as providing clean water. This approach could be extended to range of other photocatalytic and photothermal materials. Although the performance of the current system is limited by the light absorption of the model photocatalysts, the activity may be improved further via the use of different photocatalytic materials, Zscheme utilization, solar concentration and more efficient SVG for water evaporation. While the reaction temperature when using liquid water is limited to less than 100 °C, which limits the use of highly concentrated solar irradiation (without external cooling), this design opens up the possibility for the use of concentrated solar light to enhance photocatalytic activity and improve scalability. This design approach could be used in a large-scale floating plant and can benefit from the utilization of parabolic solar concentrators to enhance photocatalytic activity and solar fuels production efficiency as well as to reduce the amount of active material to save cost as we proposed in Supplementary Fig. . A membrane gas separation unit could also be incorporated into the hypothetical floating plant to prevent pressure build-up and ensure the hydrogen and oxygen gas mixture remains out of explosive limits. The work also has the potential to be adapted to other moisture harvesting systems such as the atmospheric water harvester using metal-organic framework for similar applications in arid areas.