Layer-Spacing-Enlarged MoS<sub>2</sub> Superstructural Nanotubes with Further Enhanced Catalysis and Immobilization for Li-S Batteries.
basic_science · Level V
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- Record sourced from PubMed, PMID 32330003.
- Also identified by DOI 10.1021/acsnano.0c01124.
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Abstract
A layer-spacing-enlarged MoS<sub>2</sub> nanotube (LE-MoS<sub>2</sub>) consisting of hierarchical superstructural nanosheets (-MoS<sub>2</sub>-carbon layer-MoS<sub>2</sub>-) was fabricated and served as the sulfur host. The (002) lattice plane of LE-MoS<sub>2</sub> is greatly expanded to 1.04 nm and 67.7% higher than that of the conventional 2H-MoS<sub>2</sub>. Benefitting from the layer-spacing-enlarged hierarchical superstructure of LE-MoS<sub>2</sub>, the catalytic effect on the S<sub>(s)</sub>-Li<sub>2</sub>S<sub><i>x</i></sub> (soluble, <i>x</i> > 6)-Li<sub>2</sub>S<sub><i>y</i></sub> (soluble, <i>y</i> > 2)-Li<sub>2</sub>S<sub>(s)</sub> phase transformation kinetics and immobilizing effect on the soluble Li<sub>2</sub>S<sub><i>y</i></sub> in Li-S batteries are both further enhanced and demonstrated by <i>in situ</i> X-ray adsorption near-edge structure spectroscopy and first-principles calculations. The formation of hierarchical superstructural nanosheets was carefully investigated by customized synchrotron vacuum ultraviolet photoionization mass spectrometry.