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A Mo5N6 electrocatalyst for efficient Na2S electrodeposition in room-temperature sodium-sulfur batteries.
- Source :
- Nature Communications; 12/10/2021, Vol. 12 Issue 1, p1-11, 11p
- Publication Year :
- 2021
-
Abstract
- Metal sulfides electrodeposition in sulfur cathodes mitigates the shuttle effect of polysulfides to achieve high Coulombic efficiency in secondary metal-sulfur batteries. However, fundamental understanding of metal sulfides electrodeposition and kinetics mechanism remains limited. Here using room-temperature sodium-sulfur cells as a model system, we report a Mo<subscript>5</subscript>N<subscript>6</subscript> cathode material that enables efficient Na<subscript>2</subscript>S electrodeposition to achieve an initial discharge capacity of 512 mAh g<superscript>−1</superscript> at a specific current of 1 675 mA g<superscript>−1</superscript>, and a final discharge capacity of 186 mAh g<superscript>−1</superscript> after 10,000 cycles. Combined analyses from synchrotron-based spectroscopic characterizations, electrochemical kinetics measurements and density functional theory computations confirm that the high d-band position results in a low Na<subscript>2</subscript>S<subscript>2</subscript> dissociation free energy for Mo<subscript>5</subscript>N<subscript>6</subscript>. This promotes Na<subscript>2</subscript>S electrodeposition, and thereby favours long-term cell cycling performance. Incomplete conversion of sodium polysulfides represents a significant issue in room-temperature sodium-sulfur batteries. Here, the authors propose Mo<subscript>5</subscript>N<subscript>6</subscript> as an electrocatalyst for efficient Na<subscript>2</subscript>S electrodeposition and improved cell cycling performances. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 20411723
- Volume :
- 12
- Issue :
- 1
- Database :
- Complementary Index
- Journal :
- Nature Communications
- Publication Type :
- Academic Journal
- Accession number :
- 154087073
- Full Text :
- https://doi.org/10.1038/s41467-021-27551-7