Dissociating stable nitrogen molecules under mild conditions by cyclic strain engineering.
basic_science · Level V
Where this comes from
- Record sourced from PubMed, PMID 31701007.
- Also identified by DOI 10.1126/sciadv.aax8275 and PMC identifier 6824848.
- Licence recorded as CC BY-NC.
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Abstract
All quiet on the nitrogen front. The dissociation of stable diatomic nitrogen molecules (N<sub>2</sub>) is one of the most challenging tasks in the scientific community and currently requires both high pressure and high temperature. Here, we demonstrate that N<sub>2</sub> can be dissociated under mild conditions by cyclic strain engineering. The method can be performed at a critical reaction pressure of less than 1 bar, and the temperature of the reaction container is only 40°C. When graphite was used as a dissociated N* receptor, the normalized loading of N to C reached as high as 16.3 at/at %. Such efficient nitrogen dissociation is induced by the cyclic loading and unloading mechanical strain, which has the effect of altering the binding energy of N, facilitating adsorption in the strain-free stage and desorption in the compressive strain stage. Our finding may lead to opportunities for the direct synthesis of N-containing compounds from N<sub>2</sub>.