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Electrocatalyzing S Cathodes via Multisulfiphilic Sites for Superior Room-Temperature Sodium-Sulfur Batteries.
- Source :
-
ACS nano [ACS Nano] 2020 Jun 23; Vol. 14 (6), pp. 7259-7268. Date of Electronic Publication: 2020 May 27. - Publication Year :
- 2020
-
Abstract
- Room-temperature sodium-sulfur (RT-Na/S) batteries hold great promise for sustainable and cost-effective applications. Nevertheless, it remains a great challenge to achieve high capacity and cycling stability due to the low activity of sulfur and the sluggish conversion kinetics between polysulfide intermediates and sodium sulfide. Herein, an electrocatalyzing S cathode is fabricated, which consists of porous core-shell structure and multisulfiphilic sites. The flexible carbon structure effectively buffers volume changes during cycling and provides enclosed spaces to store S <subscript>8</subscript> with exceptional conductivity. Significantly, the multisulfiphilic sites (ZnS and CoS <subscript>2</subscript> ) enhance catalysis toward multistep S conversion, which effectively suppresses long-chain polysulfides dissolution and improves the kinetics of short-chain polysulfides. Thus, the obtained S cathodes achieve an enhanced cycling performance (570 mAh g <superscript>-1</superscript> at 0.2 A g <superscript>-1</superscript> over 1000 cycles), decent rate capability (250 mAh g <superscript>-1</superscript> at 1.0 A g <superscript>-1</superscript> over 2000 cycles), and high energy density of 384 Wh kg <superscript>-1</superscript> toward practical applications.
Details
- Language :
- English
- ISSN :
- 1936-086X
- Volume :
- 14
- Issue :
- 6
- Database :
- MEDLINE
- Journal :
- ACS nano
- Publication Type :
- Academic Journal
- Accession number :
- 32433868
- Full Text :
- https://doi.org/10.1021/acsnano.0c02488