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Improvement of Na Ion Electrode Activity of Metal Oxide via Composite Formation with Metal Sulfide

Title
Improvement of Na Ion Electrode Activity of Metal Oxide via Composite Formation with Metal Sulfide
Authors
Oh, Seung MiKim, In YoungPatil, Sharad B.Park, BoyeonLee, Jang MeeAdpakpang, KanyapornChae, Seen AeHan, Oc HeeHwang, Seong-Ju
Ewha Authors
황성주한옥희Patil Sharad Bandu
SCOPUS Author ID
황성주scopus; 한옥희scopus
Issue Date
2017
Journal Title
ACS APPLIED MATERIALS & INTERFACES
ISSN
1944-8244JCR Link
Citation
vol. 9, no. 3, pp. 2249 - 2260
Keywords
composite materialscomposite formationmetal sulfideNa ion batteriescapacitive storage
Publisher
AMER CHEMICAL SOC
Indexed
SCI; SCIE; SCOPUS WOS scopus
Abstract
The composite formation with a conductive metal sulfide domain can provide an effective methodology to improve the Na-ion electrode functionality of metal oxide. The heat treatment of TiO2(B) under CS2 flow yields an intimately coupled TiO2(B)-TiS2 nanocomposite with intervened TiS2 domain, since the reaction between metal oxide and CS2, leads to the formation of metal sulfide and CO2. The negligible change in lattice parameters and significant enhancement of visible light absorption upon the reaction with CS2 underscore the formation of conductive metal sulfide domains. The resulting TiO2(B)-TiS2 nanocomposites deliver greater discharge capacities with better rate characteristics for electrochemical sodiation-desodiation process than does the pristine TiO2(B). The Na-23 magic angle spinning nuclear magnetic resonance analysis clearly demonstrates that the electrode activities of the present nanocomposites rely on the capacitive storage of Na+ ions, and the TiS2 domains in TiO2(B)-TiS2 nanocomposites play a role as mediators for Na+ ions to and from TiO2(B) domains. According to the electrochemical impedance spectroscopy, the reaction with CS2 leads to the significant enhancement of charge transfer kinetics, which is responsible for the accompanying improvement in electrode performance. The present study provides clear evidence for the usefulness in composite formation between the semiconducting metal oxide and metal sulfide in exploring new efficient NIB electrode materials.
DOI
10.1021/acsami.6b11220
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자연과학대학 > 화학·나노과학전공 > Journal papers
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