AI Article Synopsis
- Researchers developed a hydrogenated metal oxide (HMoO) that transforms from a semiconductor to a quasi-metallic state through hydrogen doping, achieving high solar absorption across the visible-to-near-infrared spectrum.
- The HMoO material demonstrated exceptional effectiveness for solar-driven water evaporation, producing a high water vapor generation rate of 1.37 kg per m² per hour and achieving 84.8% solar-to-vapor efficiency.
- This innovative approach provides a cost-effective solution for photothermal materials using affordable metal oxides, with potential applications in generating clean water from seawater under natural sunlight.
Article Abstract
Searching for cost-effective photothermal material that can harvest the full solar spectrum is critically important for solar-driven water evaporation. Metal oxides are cheap materials but cannot cover the full solar spectrum. Here we prepared a hydrogenated metal oxide (HMoO) material, in which H-doping causes the insulator-to-metal phase transition of the originally semiconductive MoO. It offers a blackbody-like solar absorption of ≥95% over the entire visible-to-near-infrared solar spectrum, owing to its unusual quasi-metallic energy band, and high solar-to-heat conversion rate due to quick relaxation of excited electrons. Using a self-floating HMoO/airlaid paper photothermal film, we achieved a stable and high water vapor generation rate of 1.37 kg m h, a superb solar-to-vapor efficiency of 84.8% under 1 sun illumination, and daily production of 12.4 L of sanitary water/m from seawater under natural sunlight. This thus opens a new avenue of designing cost-effective photothermal materials based on metal oxides.
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| http://dx.doi.org/10.1021/acs.jpclett.0c00592 | DOI Listing |
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