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Harnessing All-Solar Energy: Nanocrystal Breakthrough Transforms Infrared Light Conversion

September 16, 2023
in Science
Harnessing All-Solar Energy: Nanocrystal Breakthrough Transforms Infrared Light Conversion
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Copper-Doped Tungstic Acid Nanocrystal

(Left) A single copper-doped tungstic acid nanocrystal; (right) Atomic resolution image of the nanocrystal. Credit: Melbert Jeem

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, visible, and ultraviolet spectra; however, current solar technology utilizes primarily visible and ultraviolet rays. Technology to utilize the full spectrum of solar radiation—called all-solar utilization—is still in its infancy.

Research Findings From Hokkaido University

A team of researchers from Hokkaido University, led by Assistant Professor Melbert Jeem and Professor Seiichi Watanabe at the Faculty of Engineering, have synthesized tungstic acid-based materials doped with copper that exhibited all-solar utilization. Their findings were recently published in the journal Advanced Materials.

“Currently, the near- and mid-infrared spectra of solar radiation, ranging from 800 nm to 2500 nm, is not utilized for energy generation,” explains Jeem. “Tungstic acid is a candidate for developing nanomaterials that can potentially utilize this spectrum, as it possesses a crystal structure with defects that absorb these wavelengths.”

Relative Light Absorption of Tungstic Acid Nanocrystals

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, 2023

Methodology and Results

The 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 structures and light-absorbing properties of these nanocrystals were analyzed; their photothermal, photo-assisted water evaporation, and photo-electrochemical characteristics were measured.

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 (photothermal characteristic); 1% copper doped crystals also exhibited the greatest water evaporation efficacy, at approximately 1.0 kg per m2 per hour. Structural analysis of the 1% copper-doped nanocrystals indicated that the copper ions may be distorting the crystal structure of tungsten oxide, leading to the observed characteristics when light is absorbed.

Concluding Remarks

“Our discoveries mark a significant advance in advancement in the design of nanocrystallites capable of both synthesizing and harnessing all-solar energy,” concludes Watanabe. “We have demonstrated that copper doping grants tungstic acid nanocrystal a variety of characteristics via all-solar utilization. This provides a framework for further research in the field as well as for the development of applications.”

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, Advanced Materials.
DOI: 10.1002/adma.202305494

This work was supported by Japan Society for the Promotion of Science (JSPS) KAKENHI (20H00295, 21K04823). This work was partly achieved through a supercomputer system at the information initiative center, Hokkaido University. This work was conducted in Hokkaido University, supported by Advanced Research Infrastructure for Materials and Nanotechnology in Japan (ARIM) of the Ministry of Education, Culture, Sports, Science and Technology (MEXT).

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Copyright for syndicated content belongs to the linked Source : SciTechDaily – https://scitechdaily.com/harnessing-all-solar-energy-nanocrystal-breakthrough-transforms-infrared-light-conversion/

Tags: All-SolarHarnessingscience
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