Fabrication and electrochemical performance of nanoporous carbon derived from silicon oxycarbide

• DOI: 10.1016/j.micromeso.2014.09.047
• Publication Date: 2014-09-28T20:21:51Z
• Authors: Liqun Duan; Qingsong Ma; Lin Mei; Zhaohui Chen
• Keywords: Nanoporous; Carbon fibers

Abstract Microporous and mesoporous silicon oxycarbide derived carbons (SiOC-DCs) were obtained by chlorination with post treatment in ammonia (NH 3 ) using a commercially available polymethyl(phenyl)siloxane resin. In this paper, attentions were focused on the structural evolution and electrochemical performance of SiOC-DCs as a function of pyrolysis temperature. Results showed that the geometry and macrostructure of SiOC-DCs, as well as the carbon ribbons were finely inherited from SiOC. The SiOC-DCs porosity and crystallinity depends mainly on the pyrolysis temperature. Post treatment by NH 3 could further increase the sample porosity, and had little affection on the carbon crystallinity. The final SiOC-DCs samples exhibit excellent electrochemical performance as electrodes for supercapacitors, with a relatively high specific capacitance value up to 148.7 F g −1 and good capacitance retention ratio up to 94.3% after 2000 charge–discharge cycles at a current density of 1 A g −1 with KOH aqueous solutions as electrolyte. Increasing pyrolysis temperature would lead to a continual decline of specific capacitance.