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Topological Insulator‐Assisted MoSe 2 /Bi 2 Se 3 Heterostructure: Achieving Fast Reaction Kinetics Toward High Rate Sodium‐Ion Batteries
Author(s) -
Li Yu,
Han Manshu,
Zhou Zhihao,
Xia Xinhui,
Chen Qingguo,
Chen Minghua
Publication year - 2021
Publication title -
chemelectrochem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.182
H-Index - 59
ISSN - 2196-0216
DOI - 10.1002/celc.202001409
Subject(s) - materials science , heterojunction , anode , topological insulator , kinetics , ion , work function , electrode , insulator (electricity) , hydrothermal circulation , electrochemistry , electron transport chain , electron transfer , nanotechnology , topology (electrical circuits) , chemical physics , chemical engineering , optoelectronics , condensed matter physics , chemistry , physics , layer (electronics) , quantum mechanics , biochemistry , mathematics , combinatorics , engineering
Owing to the large interlayer spacing and the excellent theoretical capacity of MoSe 2 , it has great potential to be applied as an anode material for sodium‐ion batteries. However, the rate performance of MoSe 2 is strongly limited by the insufficient intrinsic electron transfer kinetics. Herein, a simple two‐step hydrothermal method to construct MoSe 2 /Bi 2 Se 3 heterostructures was developed by growing MoSe 2 nanosheets onto Bi 2 Se 3 nanoflakes directly. The typical topological insulator possesses ultrafast surface electronic conductivity, which makes the batteries exhibit a superior rate capability and considerable cycling stability. At a high rate of 10 A g −1 , the MoSe 2 /Bi 2 Se 3 electrode still delivered a superior capacity of 244 mA h g −1 (about 60 % of the discharge capacity at 0.1 A g −1 ), which is better than that in some of the previously reported MoSe 2 /carbon composites. It also can compare with some of the MoSe 2 ‐containing complex sandwich architectures. Such unique rate performance is bound strongly with high interlayer spacing and rapid electron transfer kinetics. Besides, the different Fermi level energies of Bi 2 Se 3 (work function is 5.61 eV) and MoSe 2 (work function is 4.3 eV) probably induce a built‐in electric field nearby the heterofaces. The electric force could promote Na ions diffusibility upon cycling, leading to high reversible capacity and excellent rate performance.