Premium
Tunable Electrocatalytic Behavior of Sodiated MoS 2 Active Sites toward Efficient Sulfur Redox Reactions in Room‐Temperature Na–S Batteries
Author(s) -
Wang Yanxia,
Lai Yangyang,
Chu Jun,
Yan Zichao,
Wang YunXiao,
Chou ShuLei,
Liu HuaKun,
Dou Shi Xue,
Ai Xinping,
Yang Hanxi,
Cao Yuliang
Publication year - 2021
Publication title -
advanced materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.707
H-Index - 527
eISSN - 1521-4095
pISSN - 0935-9648
DOI - 10.1002/adma.202100229
Subject(s) - redox , polysulfide , electrochemistry , materials science , cathode , sulfur , chemical engineering , doping , nanotechnology , electrode , inorganic chemistry , chemistry , optoelectronics , electrolyte , engineering , metallurgy
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 2 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 2 active sites play a key role in catalyzing polysulfide redox reactions, especially the conversion from long‐chain Na 2 S n (4 ≤ n ≤ 8) to short‐chain Na 2 S 2 and Na 2 S. Significantly, the electrocatalytic activity of MoS 2 can be tunable via adjusting the discharge depth. It is remarkable that the sodiated MoS 2 exhibits much stronger binding energy and electrocatalytic behavior compared to MoS 2 sites, effectively enhancing the formation of the final Na 2 S product. Consequently, the S cathode achieves superior electrochemical performance in RT Na–S batteries, delivering a high capacity of 774.2 mAh g −1 after 800 cycles at 0.2 A g −1 , and an ultrahigh capacity retention with a capacity decay rate of only 0.0055% per cycle over 2800 cycles.