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Microwave‐Hydrothermal Synthesis of Hierarchical Sb 2 WO 6 Nanostructures as a New Anode Material for Sodium Storage
Author(s) -
Wang Ping,
Xie Sanmu,
She YiYi,
Fan Wenguang,
Leung Michael K. H.,
Wang Hongkang
Publication year - 2019
Publication title -
chemistryselect
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.437
H-Index - 34
ISSN - 2365-6549
DOI - 10.1002/slct.201803284
Subject(s) - x ray photoelectron spectroscopy , sodium tungstate , materials science , anode , tungstate , hydrothermal circulation , chemical engineering , nanostructure , hydrothermal synthesis , transmission electron microscopy , ternary operation , antimony , electrode , nanotechnology , chemistry , metallurgy , programming language , computer science , engineering , tungsten
Novel hierarchical antimony tungstate (Sb 2 WO 6 ) nanostructures with hollow disk‐like morphology, which are layer‐by‐layer assembled from Sb 2 WO 6 nanosheets, are prepared by a facile microwave‐hydrothermal method. The as‐prepared Sb 2 WO 6 is firstly applied as an anode material for sodium ion batteries (SIBs), which shows superior cycle stability and rate capability, delivering a reversible capacity of ∼350 mA h/g after 100 cycles at 200 mA/g and even ∼285 mA h/g at a high rate of 2 A/g. The sodium storage mechanism is revealed via ex‐situ transmission electron microscope (TEM), X‐ray photoelectron spectroscopy (XPS) and X‐ray diffraction (XRD) analyses, which is based on the reversible alloying/dealloying reaction ( S b + 3N a + + 3 e - ↔ N a 3 S b ) and the reversible conversion reaction (N a 2 W O 4 + 6N a + + 6 e - ↔ W + 4N a 2 O ) in the ternary oxide of Sb 2 WO 6 . The different sodiation/desodiation reactions in the Sb 2 WO 6 electrode happens in a step‐wise manner owing to the different working potentials, which thus alleviate the volume change induced pulverization and synergistically contribute to the superior sodium storage performance.