01 January 2019 6 2K Report

Hi

I am studying about porous carbon materials for using Li-S battery.

I'm using teflon to remove silica from porous carbon & SiO2 particles.

I used to teflon instead of NaOH when etching the silica.

But, there are some questions about the materials that comes out of pyrolysis in teflon.

Teflon is pyrolyzed to C4F8 (g) at 350~450 ºC. (in N2 gas)

C4F8 + 2SiO2 --> 2SiF4 (g) + 2CO2 (g) + 2C (major)

C4F8 + SiO2 --> SiF4 (g) + 2COF2 (g) + 2C (minor)

I believe that SiO2 is removed and COF2 is deposited on carbon, resulting in F-doped carbon.

I think that source of F-doping is COF2 (g).

But, I have not found the exact F-doping mechanism.

Help me. thank you

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