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Lysine-assisted rapid synthesis of crack-free hierarchical carbon monoliths with a hexagonal array of mesopores

机译:赖氨酸辅助快速合成具有六方介孔阵列的无裂纹多级碳单体

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摘要

The rapid and scalable synthesis of hierarchical carbon monoliths with an ordered meso-structure and fully interconnected macropores has been demonstrated. Resorcinol and formaldehyde based polymers were used as the carbon precursor, triblock copolymer Plu-ronic F127 as the structural directing agent, and organic base lysine as both the polymerization catalyst and mesostructure assembly promoter. In the presence of lysine, homogeneous and crack-free polymer monoliths can be obtained through rapid gelation in 15 min at 90 °C. The polymer monoliths have a robust framework, which can be directly dried at 50 °C in air and carbonized at high temperature under a nitrogen atmosphere. The carbon monoliths are crack-free and have an ordered mesostructure with fully interconnected macropores. The surface area and the macropore volume are high with values up to 600 m~2 g~(-1) and 3.52 cm~3 g~(-1), respectively. Further steam activation of the carbon monolith can significantly improve the surface area to 2422 m~2 g~(-1) while still maintaining the ordered mesostructure.
机译:已经证明了具有有序介观结构和完全互连的大孔隙的多级碳单体的快速和可扩展的合成。以间苯二酚和甲醛基聚合物为碳前驱体,以三嵌段共聚物Plu-ronic F127为结构导向剂,有机碱赖氨酸为聚合催化剂和介观结构组装促进剂。在赖氨酸存在下,通过在90°C下快速凝胶15分钟,可以获得均匀且无裂纹的聚合物整体。 聚合物整体具有坚固的框架,可在50°C的空气中直接干燥,并在氮气气氛下高温碳化。碳整体是无裂纹的,具有有序的介观结构,具有完全相互连接的大孔隙。表面积和大孔体积较高,分别高达600 m~2 g~(-1)和3.52 cm~3 g~(-1)。进一步蒸汽活化碳单体可以显著提高比表面积至2422 m~2 g~(-1),同时仍保持有序的细观结构。

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