Systematic copper doping boosts all-solar utilization in tungstic acid nanocrystals. Sunlight is an inexhaustible source of energy, and utilizing sunlight to generate electricity is one of the cornerstones of renewable energy. More than 40% of the sunlight that falls on Earth is in the infrared,
A single copper-doped tungstic acid nanocrystal; Atomic resolution image of the nanocrystal. Credit: Melbert JeemSunlight is an inexhaustible source of energy, and utilizing sunlight to generate electricity is one of the cornerstones of renewable energy. More than 40% of the sunlight that falls on Earth is in the infrared, visible, and ultraviolet spectra; however, current solar technology utilizes primarily visible and ultraviolet rays.
A summarized relative light absorption of the tungstic acid crystals ranging from ultraviolet to infrared light. 1, 5, and 10 are the copper concentrations resulting in opto-criticality of the nanocrystals. Credit: Melbert Jeem, et al. Advanced Materials. July 29, 2023The scientists used a photo-fabrication technique they had previously developed, submerged photo-synthesis of crystallites, to synthesize tungstic acid nanocrystals doped with varying concentrations of copper.
The copper-doped tungsten oxide nanocrystals absorb light across the spectrum, from ultraviolet through visible light to infrared; the amount of infrared light absorbed was greatest at 1% copper doping. 1% and 5% copper-doped nanocrystals exhibited the highest temperature elevation ; 1% copper doped crystals also exhibited the greatest water evaporation efficacy, at approximately 1.0 kg per m2 per hour.
Reference: “Defect Driven Opto-Critical Phases Tuned for All-Solar Utilization” by Melbert Jeem, Ayaka Hayano, Hiroto Miyashita, Mahiro Nishimura, Kohei Fukuroi, Hsueh-I Lin, Lihua Zhang and Seiichi Watanabe, 29 July 2023,This work was supported by Japan Society for the Promotion of Science KAKENHI . This work was partly achieved through a supercomputer system at the information initiative center, Hokkaido University.
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