X-ray Absorption Spectroscopic Characterization of the Synthesis Process: Revealing the Interactions in Cetyltrimethylammonium Bromide-Modified Sulfur-Graphene Oxide Nanocomposites
| Autor: | Ye, Y, Kawase, A, Song, MK, Feng, B, Liu, YS, Marcus, MA, Feng, J, Fang, H, Cairns, EJ, Zhu, J, Guo, J |
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| Rok vydání: | 2016 |
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| Zdroj: | Journal of Physical Chemistry C, vol 120, iss 19 Ye, Y; Kawase, A; Song, MK; Feng, B; Liu, YS; Marcus, MA; et al.(2016). X-ray Absorption Spectroscopic Characterization of the Synthesis Process: Revealing the Interactions in Cetyltrimethylammonium Bromide-Modified Sulfur-Graphene Oxide Nanocomposites. Journal of Physical Chemistry C, 120(19), 10111-10117. doi: 10.1021/acs.jpcc.6b00751. UC Berkeley: Retrieved from: http://www.escholarship.org/uc/item/5fr8j0vv |
| DOI: | 10.1021/acs.jpcc.6b00751. |
| Popis: | © 2016 American Chemical Society. We have investigated the chemical bonding interaction of S in a CTAB (cetyltrimethylammonium bromide, CH3(CH2)15N+(CH3)3Br-)-modified sulfur-graphene oxide (S-GO) nanocomposite used as the cathode material for Li/S cells by S K-edge X-ray absorption spectroscopy (XAS). The results show that the introduction of CTAB to the S-GO nanocomposite and changes in the synthesis recipe including alteration of the S precursor ratios and the sequence of mixing ingredients lead to the formation of different S species. CTAB modifies the cathode materials through bonding with Na2Sx in the precursor solution, which is subsequently converted to C-S bonds during the heat treatment at 155 °C. Moreover, GO bonds with CTAB and acts as the nucleation center for S precipitation. All these interactions among S, CTAB, and GO help to immobilize the sulfur in the cathode and may be responsible for the enhanced cell cycle life of CTAB-S-GO nanocomposite-based Li/S cells. |
| Databáze: | OpenAIRE |
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