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Sulfur Diffusion within Nitrogen-Doped Ordered Mesoporous Carbons Determined by in Situ X-ray Scattering
- Source :
- Langmuir. 34:8767-8776
- Publication Year :
- 2018
- Publisher :
- American Chemical Society (ACS), 2018.
-
Abstract
- The low intrinsic conductivity of sulfur necessitates conductive additives, such as mesoporous carbons, to the cathode to enable high-performance metal-sulfur batteries. Simultaneous efforts to address polysulfide shuttling have introduced nitrogen-doped carbons to provide both conductivity and suppressed shuttling because of their strong interaction with sulfur. The strength of this interaction will impact the ability to fill the mesopores with sulfur via melt infusion. Here, we systematically investigate how nitrogen doping influences the rate that molten sulfur can infiltrate the mesopores and the overall extent of pore filling of highly ordered mesoporous doped carbons using in situ small angle X-ray scattering (SAXS). The similarity in electron density between molten sulfur and the soft carbon framework of the mesoporous material leads to a precipitous decrease in the scattered intensity associated with the ordered structure as voids are filled with sulfur. As the nitrogen doping increases from 1 to 20 at. %, the effective diffusivity of sulfur in the mesopores decreases by an order of magnitude (2.7 × 10
- Subjects :
- inorganic chemicals
Materials science
Chemical substance
Diffusion
chemistry.chemical_element
02 engineering and technology
010402 general chemistry
01 natural sciences
law.invention
law
Electrochemistry
General Materials Science
Spectroscopy
Scattering
X-ray
Surfaces and Interfaces
021001 nanoscience & nanotechnology
Condensed Matter Physics
Sulfur
Cathode
0104 chemical sciences
Chemical engineering
chemistry
0210 nano-technology
Science, technology and society
Mesoporous material
Subjects
Details
- ISSN :
- 15205827 and 07437463
- Volume :
- 34
- Database :
- OpenAIRE
- Journal :
- Langmuir
- Accession number :
- edsair.doi.dedup.....f4040828b1d13dd80f10fd861c20a912