Five nanoporous carbons (NPCs) were prepared by polymerizing and then carbonizing carbon precursor of furfuryl alcohol accommodated in a porous metal-organic framework (MOF-5, Zn4O(bdc)3, bdc = 1,4-benzenedicarboxylate) template. The Brunauer-Emmett-Teller (BET) surface areas for five NPC samples obtained by carbonizing at the temperatures from 530 to 1000 °C fall into the range from 1140 to 3040 m~2 g~(-1) and the dependence of BET surface areas on carbonization temperatures shows a "V" shape. All the five NPC samples have a pore size distribution centered at about 3.9 nm. As electrode materials for supercapacitor, the NPC samples obtained at the temperatures higher than 600 °C display the ideal capacitor behaviors and give rise to almost constant specific capacitance (above 100 F g~(-1) at 5 mV s~(-1)) at various sweep rates, which is associated with their mesoporous characteristics. However, the NPC sample with the highest BET surface area (3040 m~2 g~(-1)) obtained by carbonizing at 530 °C gives a unusually low capacitance (12 F g~(-1) at 5 mV s~(-1)), which may be attributed to the poor conductivity of the carbon material due to the low carbonization temperature.
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机译:将糠醇的前驱体聚合碳化后碳化,制备在多孔金属有机骨架(MOF-5,[Zn4O(bdc)3],bdc=1,4-苯二羧酸酯)模板中。在530—1000 °C温度下碳化得到的5个NPC样品的Brunauer-Emmett-Teller(BET)表面积在1140—3040 m~2 g~(-1)范围内,BET表面积对碳化温度的依赖性呈“V”形。所有5个鼻咽癌样品的孔径分布均集中在约3.9 nm处。作为超级电容器的电极材料,在高于600 °C的温度下获得的NPC样品表现出理想的电容器行为,并且在不同的扫描速率下产生几乎恒定的比电容(在5 mV s~(-1)时高于100 F g~(-1)),这与它们的介孔特性有关。然而,在530 °C下碳化得到的BET表面积最高(3040 m~2 g~(-1))的NPC样品具有异常低的电容(5 mV s~(-1)时为12 F g~(-1)),这可能是由于碳化温度低导致碳材料导电性差所致。
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