Fischer Johanna, Thümmler Katrin, Zlotnikov Igor, Mikhailova Daria, Fischer Steffen
Institute of Plant and Wood Chemistry, TUD Dresden University of Technology, Pienner Str. 19, 01737 Tharandt, Germany.
Leibniz Institute for Solid State and Material Research (IFW) Dresden e.V., Institute for Materials Chemistry (IMC), Helmholtzstraße 20, 01069 Dresden, Germany.
Polymers (Basel). 2024 Jul 30;16(15):2176. doi: 10.3390/polym16152176.
Cellulose microspheres have a wide range of applications due to their unique properties and versatility. Various preparation methods have been explored to tailor these microspheres for specific applications. Among these methods, the acetate method using cellulose acetate is well known. However, replacement of the acetate group through the butyrate group significantly extends the variety of morphological properties. In the present work, microspheres based on cellulose acetate butyrate are being developed with modified characteristics in terms of particle size, porosity, surface morphology and the inner structure of the microspheres. While the inner structure of cellulose acetate microspheres is predominantly porous, microspheres prepared from cellulose acetate butyrate are mainly filled or contain several smaller microspheres. Carbon materials from cellulose acetate butyrate microspheres exhibit a high specific surface area of 567 m g, even without further activation. Activation processes can further increase the specific surface area, accompanied by an adaptation of the pore structure. The prepared carbons show promising results in symmetrical supercapacitors with aqueous 6 M KOH electrolytes. Activated carbons derived from cellulose acetate butyrate microspheres demonstrate an energy density of 12 Wh kg at a power density of 0.9 kW kg.
纤维素微球因其独特的性质和多功能性而具有广泛的应用。人们探索了各种制备方法来为特定应用定制这些微球。在这些方法中，使用醋酸纤维素的醋酸酯法是众所周知的。然而，通过丁酸酯基团取代醋酸酯基团显著扩展了形态学性质的种类。在当前的工作中，正在开发基于醋酸丁酸纤维素的微球，其在粒径、孔隙率、表面形态和微球内部结构方面具有改进的特性。虽然醋酸纤维素微球的内部结构主要是多孔的，但由醋酸丁酸纤维素制备的微球主要是填充的或包含几个较小的微球。即使没有进一步活化，来自醋酸丁酸纤维素微球的碳材料也具有567 m²/g的高比表面积。活化过程可以进一步增加比表面积，并伴随着孔结构的调整。所制备的碳在含6 M KOH水溶液电解质的对称超级电容器中显示出有前景的结果。由醋酸丁酸纤维素微球衍生的活性炭在功率密度为0.9 kW/kg时表现出12 Wh/kg的能量密度。
