Improvement of na ion electrode activity of metal oxide via composite formation with metal sulfide

Seung Mi Oh, In Young Kim, Sharad B. Patil, Boyeon Park, Jang Mee Lee, Kanyaporn Adpakpang, Seen Ae Chae, Oc Hee Han, Seong Ju Hwang

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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 23Na 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.

Original languageEnglish
Pages (from-to)2249-2260
Number of pages12
JournalACS Applied Materials and Interfaces
Volume9
Issue number3
DOIs
Publication statusPublished - 2017 Jan 25

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All Science Journal Classification (ASJC) codes

  • Materials Science(all)

Cite this

Oh, S. M., Kim, I. Y., Patil, S. B., Park, B., Lee, J. M., Adpakpang, K., Chae, S. A., Han, O. H., & Hwang, S. J. (2017). Improvement of na ion electrode activity of metal oxide via composite formation with metal sulfide. ACS Applied Materials and Interfaces, 9(3), 2249-2260. https://doi.org/10.1021/acsami.6b11220