Controllable Nitrogen Doping of High-Surface-Area Microporous Carbons Synthesized from an Organic-Inorganic Sol-Gel Approach for Li-S Cathodes

By Chen, Huichao; Wei, Yanju; Wang, Jitong; Qiao, Wenming; Ling, Licheng & Long, Donghui
Published in ACS Applied Materials \& Interfaces NULL 2015

Abstract

High-surface-area microporous carbons with controllable nitrogen doping were prepared via a novel organic-inorganic sol-gel approach, using phenolic resol and hexamethoxymethyl melamine (HMMM) as carbon precursors, and partially hydrolyzed tetraethoxysilane as silica template. The pore structures of microporous carbons were completely replicated from a thin silica framework and could be tailored greatly by changing the organic/inorganic ratio. The nitrogen atoms doped into the carbon framework were issued from high-nitrogen-content HMMM precursors, and the nitrogen content could be adjusted in a wide range by changing the phenolic resol/HMMM ratio. Moreover, the porous structure and nitrogen content could be simultaneously controlled, allowing the preparation of a series of microporous carbons with almost the same microstructures (BET surface areas of ca.1900 m2·g-1and pore vol

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