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Tunable Electrocatalytic Behavior of Sodiated MoS 2 Active Sites toward Efficient Sulfur Redox Reactions in Room-Temperature Na-S Batteries.
- Source :
-
Advanced materials (Deerfield Beach, Fla.) [Adv Mater] 2021 Apr; Vol. 33 (16), pp. e2100229. Date of Electronic Publication: 2021 Mar 17. - Publication Year :
- 2021
-
Abstract
- Room-temperature (RT) sodium-sulfur (Na-S) batteries hold great promise for large-scale energy storage due to the advantages of high energy density, low cost, and resource abundance. The research progress on RT Na-S batteries, however, has been greatly hindered by the sluggish kinetics of the sulfur redox reactions. Herein, an elaborate multifunctional architecture, consisting of N-doped carbon skeletons and tunable MoS <subscript>2</subscript> sulfiphilic sites, is fabricated via a simple one-pot reaction followed by in situ sulfurization. Beyond the physical confinement and chemical binding of polarized N-doped carbonaceous microflowers, the MoS <subscript>2</subscript> active sites play a key role in catalyzing polysulfide redox reactions, especially the conversion from long-chain Na <subscript>2</subscript> S <subscript>n</subscript> (4 ≤ n ≤ 8) to short-chain Na <subscript>2</subscript> S <subscript>2</subscript> and Na <subscript>2</subscript> S. Significantly, the electrocatalytic activity of MoS <subscript>2</subscript> can be tunable via adjusting the discharge depth. It is remarkable that the sodiated MoS <subscript>2</subscript> exhibits much stronger binding energy and electrocatalytic behavior compared to MoS <subscript>2</subscript> sites, effectively enhancing the formation of the final Na <subscript>2</subscript> S product. Consequently, the S cathode achieves superior electrochemical performance in RT Na-S batteries, delivering a high capacity of 774.2 mAh g <superscript>-1</superscript> after 800 cycles at 0.2 A g <superscript>-1</superscript> , and an ultrahigh capacity retention with a capacity decay rate of only 0.0055% per cycle over 2800 cycles.<br /> (© 2021 Wiley-VCH GmbH.)
Details
- Language :
- English
- ISSN :
- 1521-4095
- Volume :
- 33
- Issue :
- 16
- Database :
- MEDLINE
- Journal :
- Advanced materials (Deerfield Beach, Fla.)
- Publication Type :
- Academic Journal
- Accession number :
- 33733506
- Full Text :
- https://doi.org/10.1002/adma.202100229