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Nitrogen‐Doped MoS 2 Foam for Fast Sodium Ion Storage
Author(s) -
Tao Peng,
He Junjie,
Shen Tong,
Hao Yu,
Yan Jingkai,
Huang Zijie,
Xu Xueer,
Li Meng,
Chen Yu
Publication year - 2019
Publication title -
advanced materials interfaces
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.671
H-Index - 65
ISSN - 2196-7350
DOI - 10.1002/admi.201900460
Subject(s) - materials science , anode , carbonization , cathode , chemical engineering , current density , doping , electrochemistry , sodium ion battery , nanotechnology , electrode , optoelectronics , composite material , chemistry , scanning electron microscope , faraday efficiency , physics , quantum mechanics , engineering
A novel 3D porous foam consisting of interlinking N‐doped MoS 2 nanosheets is synthesized through a templating‐drying‐carbonization process, where melamine‐formaldehyde is used as both template and nitrogen source. Benefit from the N‐containing MoS 2 , 3D porous structure, and residual N‐doped carbon, N‐doped MoS 2 foam (NMF) exhibits greatly improved electrochemical performance especially in term of rate capability for sodium storage compared with their pristine counterpart. Specifically, NMF shows outstanding rate capability with high reversible capacities reaching up to 407 mAh g −1 after 100 cycles under a current density of 1 A g −1 , whereas the charge capacity of pristine MoS 2 quickly decays to 60 mAh g −1 after 35 cycles at the same current density. In addition, the important role of pseudocapacitive behavior in the high rate sodium storage performances of NMF is investigated by kinetics calculation. The band structure and partial density of states of NMF are calculated in order to further explore the change of electronic structure induced by N atom doping in MoS 2 and its correlation with high rate performance. Furthermore, a Na + full‐cell with NMF anode and Na 3 V 2 (PO4) 3 cathode is assembled and successfully powered a 2 V light‐emitting diode lamp.