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首页> 外文期刊>Journal of Materials Chemistry, A. Materials for energy and sustainability >Nitrogen doped carbide derived carbon aerogels by chlorine etching of a SiCN aerogel
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Nitrogen doped carbide derived carbon aerogels by chlorine etching of a SiCN aerogel

机译：通过对CNCN气凝胶进行氯蚀刻来掺杂氮的碳化物衍生的碳气凝胶

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摘要

Silicon was selectively removed from a silicon carbonitride (SiCN) aerogel by hot chlorine gas treatment, leading to a N-doped carbon aerogel (N-CDC aerogel). The combined effects of pyrolysis and etching temperature were studied with regard to the change in the composition of the material after etching as well as the microstructure of the produced hierarchically porous material. Upon removal of Si from amorphous SiCN, carbon and nitrogen, which are not bonded together in the starting material, react, creating new C-N bonds. The removal of silicon also gives rise to a high amount of micropores and hence a high specific surface area, which can be beneficial for the functionality of the carbonaceous material produced. The mesoporous structure of the aerogel allows us to complete the etching at low temperature, which was found to be a crucial parameter to maintain a high amount of nitrogen in the material. The combination of a high amount of micropores and the mesopore transport system is beneficial for adsorption processes due to the combination of a high amount of adsorption sites and effective transport properties of the material. The N-CDC aerogels were characterized by nitrogen physisorption, X-ray photoelectron spectroscopy (XPS), thermogravimetry (TG/DTA), and infrared spectroscopy (DRIFT) and they were evaluated as CO2 absorbers and as electrodes for electric double-layer capacitors (EDLCs).
机译：通过热氯气处理选择性地从碳氮化硅（SiCN）气凝胶中除去了硅，从而形成了N掺杂碳气凝胶（N-CDC气凝胶）。研究了热解和蚀刻温度对蚀刻后材料组成的变化以及所生产的分层多孔材料的微观结构的综合影响。从非晶态SiCN中除去Si后，在原料中未键合的碳和氮发生反应，形成新的C-N键。硅的去除还产生大量的微孔并因此产生高的比表面积，这对于所生产的碳质材料的功能性可能是有利的。气凝胶的中孔结构使我们能够在低温下完成蚀刻，这是保持材料中大量氮的关键参数。大量微孔和中孔传输系统的结合，由于大量吸附位点和材料的有效传输特性的结合，对吸附过程有利。 N-CDC气凝胶的特征在于氮物理吸附，X射线光电子能谱（XPS），热重法（TG / DTA）和红外光谱（DRIFT），它们被评估为CO2吸收剂和双电层电容器的电极（ EDLC）。

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