Utilizing full-spectrum sunlight for ammonia decomposition to hydrogen over GaN nanowires-supported Ru nanoparticles on silicon.
basic_science · Level V
Where this comes from
- Record sourced from PubMed, PMID 39191764.
- Also identified by DOI 10.1038/s41467-024-51810-y and PMC identifier 11350218.
- Licence recorded as CC BY-NC-ND.
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Abstract
Photo-thermal-coupling ammonia decomposition presents a promising strategy for utilizing the full-spectrum to address the H<sub>2</sub> storage and transportation issues. Herein, we exhibit a photo-thermal-catalytic architecture by assembling gallium nitride nanowires-supported ruthenium nanoparticles on a silicon for extracting hydrogen from ammonia aqueous solution in a batch reactor with only sunlight input. The photoexcited charge carriers make a predomination contribution on H<sub>2</sub> activity with the assistance of the photothermal effect. Upon concentrated light illumination, the architecture significantly reduces the activation energy barrier from 1.08 to 0.22 eV. As a result, a high turnover number of 3,400,750 is reported during 400 h of continuous light illumination, and the H<sub>2</sub> activity per hour is nearly 1000 times higher than that under the pure thermo-catalytic conditions. The reaction mechanism is extensively studied by coordinating experiments, spectroscopic characterizations, and density functional theory calculation. Outdoor tests validate the viability of such a multifunctional architecture for ammonia decomposition toward H<sub>2</sub> under natural sunlight.