Dredging sodium polysulfides using a Fe3C electrocatalyst to realize improved room-temperature Na–S batteries

Author(s)
Huang, Xiang Long
Hussain, Tanveer
Liu, Hanwen
Kaewmaraya, Thanayut
Xu, Maowen
Liu, Hua Kun
Dou, Shi Xue
Wang, Zhiming
Publication Date
2023-07-21
Abstract
<p>The shuttle effect of soluble polysulfides is a critical challenge that hinders the realization of pragmatic room-temperature sodium–sulfur (RT Na–S) batteries. To surmount this intractable issue, carbon nanorods decorated with highly sulfiphilic nanosized cementite (nano-Fe<sub>3</sub>C) are employed to serve as the role of S host. The nano-Fe<sub>3</sub>C strongly interacts with soluble polysulfide intermediates via Fe–S bonds to block their shuttling action. More significantly, the nano-Fe<sub>3</sub>C enables the dredging of these polysulfides via its electrocatalytic effect, which is accompanied by improved redox kinetics. Moreover, the hierarchical porous carbon nanorod substrate promotes the fast transport of electrons and accommodates the dramatic volumetric fluctuation of the active materials. As a result, the nano-Fe<sub>3</sub>C-decorated S cathode demonstrates outstanding cyclability (capacity retention of 373 mA h g<sub>−1</sub> over 900 cycles at 1.0 A g<sub>−1</sub> ).This work presents an excellent highly efficient electrocatalyst that realizes improved RT Na–S batteries.</p>
Citation
Inorganic Chemistry Frontiers, 10(14), p. 4241-4251
ISSN
2052-1553
2052-1545
Link
Publisher
Royal Society of Chemistry
Title
Dredging sodium polysulfides using a Fe3C electrocatalyst to realize improved room-temperature Na–S batteries
Type of document
Journal Article
Entity Type
Publication

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