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Niobium Carbide as a Promising Pseudocapacitive Sodium‐Ion Storage Anode
Author(s) -
Wang Shige,
Shao Lianyi,
Yu Lu,
Guan Jieduo,
Shi Xiaoyan,
Sun Zhipeng,
Cai Junjie,
Huang Haitao,
Trukhanov Alex
Publication year - 2021
Publication title -
energy technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.91
H-Index - 44
eISSN - 2194-4296
pISSN - 2194-4288
DOI - 10.1002/ente.202100298
Subject(s) - materials science , anode , electrochemistry , niobium carbide , cyclic voltammetry , niobium , sodium ion battery , carbide , chemical engineering , transmission electron microscopy , inorganic chemistry , nanotechnology , electrode , metallurgy , chemistry , faraday efficiency , engineering
Niobium carbide (NbC) is used as anode material for sodium‐ion batteries for the first time. Ball‐milled NbC delivers an initial charge capacity of 242 mAh g −1 at 0.1 A g −1 and a capacity of 126 mAh g −1 after 1000 cycles at a high current density of 5 A g −1 without carbon coating. Cyclic voltammetry curves demonstrate that the pseudocapacitive Na + storage behavior dominates the electrochemical reaction, which is responsible for the good rate capability. Ex situ X‐ray diffraction (XRD), transmission electron microscopy (TEM), and density functional theory (DFT) calculations show that the electrochemical reaction between NbC and Na is attributed to an adsorption mechanism.