Direct and Sustainable Ammonia Synthesis from Air and Water with Sulfur-Deficient MoS<sub>2</sub> Piezocatalysts.

With increasing reaction time, two distinct peaks located at approximately 819 and 993 cm –1 correspond to Mo–N stretching vibrations and gradually intensify. Figure f shows that the in situ diffuse reflectance infrared Fourier-transform spectroscopy (DRIFT) further provides the adsorption configuration of N 2 molecules, demonstrating that a peak at 1650 cm –1 corresponds to a side-on configuration, exhibiting an increasing trend over time. , Results from XPS, Raman, and DRIFT analyses indicate that unsaturated Mo atoms exposed by sulfur vacancies act as active sites for nitrogen bonding.

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