Effect of the CO<sub>2</sub> activation parameters on the pore structure of silicon carbide-derived carbons

DUAN Li-qun; MA Qing-song; MA Lin-jian; DONG Lu; WANG Bo; DAI Xiao-qing; ZHANG Bo

doi:10.1016/S1872-5805(19)60019-3

Volume 34 Issue 4

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Article Navigation > New Carbon Mater. > 2019 > 34(4): 367-372

DUAN Li-qun, MA Qing-song, MA Lin-jian, DONG Lu, WANG Bo, DAI Xiao-qing, ZHANG Bo. Effect of the CO2 activation parameters on the pore structure of silicon carbide-derived carbons. New Carbon Mater., 2019, 34(4): 367-372. doi: 10.1016/S1872-5805(19)60019-3

Citation:

DUAN Li-qun, MA Qing-song, MA Lin-jian, DONG Lu, WANG Bo, DAI Xiao-qing, ZHANG Bo. Effect of the CO₂ activation parameters on the pore structure of silicon carbide-derived carbons. New Carbon Mater., 2019, 34(4): 367-372. doi: 10.1016/S1872-5805(19)60019-3

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Effect of the CO₂ activation parameters on the pore structure of silicon carbide-derived carbons

doi: 10.1016/S1872-5805(19)60019-3

1.
State Key Laboratory of Disaster Prevention & Mitigation of Explosion & Impact, Army Engineering University of PLA, Nanjing 210007, China;
2.
Science and Technology on Advanced Ceramic Fibers & Composites Laboratory, National University of Defense Technology, Changsha 410073, China

Funds: Natural Foundation of Jiangsu Province, China(BK20170754).

Received Date: 2019-04-29
Accepted Date: 2019-09-10
Rev Recd Date: 2019-06-30
Publish Date: 2019-08-28

Abstract

Abstract

A silicon carbide derived carbon (SiC-DC) with a high specific surface area (SSA) fabricated by chlorination of a silicon carbide derived from polysiloxane was activated by CO₂. The effect of activation temperature and time on the microstructure of the activated samples was investigated by N₂ sorption, XRD, SEM and TEM. Results showed that CO₂ activation effectively changed the pore structure of the SiC-DC and had little impact on carbon crystallinity. The activated samples retained the morphology of the SiC powder or the non-activated SiC-DC. The SSA, total pore volume (Vtot) and micropore volume of the activated SiC-DCs all increased and the yield decreased with increasing activation temperature or time. The SSA and Vtot increased by 46.5% (from 1 316.8 to 1 929.0 m²·g^-1) and 86.4% (from 0.560 to 1.044 cm³·g^-1), respectively after the SiC-DC was activated at 950℃ for 2 h, mainly as a result of the increased micropore volume.
- Polysiloxane,
- Silicon carbide,
- Carbide derived carbon,
- Pore structure,
- CO₂ activation

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