Carbon nanofibers (CNFs) derived from electrospun polyacrylonitrile (PAN) were investigated with respect to their gas adsorption properties. By employing CO₂ adsorption measurements, it is shown that the adsorption capacity and selectivity of the fibers can be tailored by means of the applied carbonization temperature. General pore properties of the CNFs were identified by Ar adsorption measurements, whereas CO₂ adsorption measurements provided information about the ultramicroporosity, adsorption energies, and adsorption capacities. Ideal adsorbed solution theory (IAST) selectivities under practically relevant conditions were determined by evaluation of single‐component data for N₂ and CO₂. Especially for low carbonization temperatures, the CNFs exhibit very good low‐pressure adsorption performance and excellent CO₂/N₂ IAST selectivities of 350 at 20 mbar and 132 at 1 bar, which are attributed to a molecular‐sieve effect in very narrow slit pores. These IAST selectivities are some of the highest values for carbon materials reported in the literature so far and the highest IAST selectivities for as‐prepared, non‐post‐treated carbon ever.

中文翻译：

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用于气体分离和储存的电纺碳纳米纤维的定制气体吸附特性。

研究了源自电纺聚丙烯腈（PAN）的碳纳米纤维（CNF）的气体吸附性能。通过采用CO ₂吸附测量，表明纤维的吸附能力和选择性可以通过所应用的碳化温度来调节。CNF 的一般孔隙特性通过 Ar 吸附测量来确定，而 CO ₂吸附测量提供了有关超微孔隙率、吸附能和吸附容量的信息。_{通过评估 N 2}和 CO ₂的单组分数据来确定实际相关条件下的理想吸附溶液理论 (IAST) 选择性。特别是在低碳化温度下，CNF 表现出非常好的低压吸附性能和优异的 CO ₂ /N ₂ IAST 选择性，在 20 mbar 时为 350，在 1 bar 时为 132，这归因于非常窄的狭缝孔中的分子筛效应。这些 IAST 选择性是迄今为止文献中报道的碳材料的最高值，也是迄今为止制备的、未经后处理的碳的最高 IAST 选择性。