用作双电层电容器电极材料的三维层次孔结构多孔炭的合成

以葡萄糖为碳源,由金属框架有机物( MOF)高效地合成出一种具有三维层次孔结构的多孔炭.当葡萄糖渗入到方形MOF的表面或内部空隙之后,逐步进行聚合和炭化.在此过程中,MOF分解出ZnO,ZnO进一步被基体炭或CO还原成Zn；而Zn又在炭化过程中逸出,以致形成连续的基体炭组织.当所合成的多孔炭用作双电层电容器电极材料时,在1 mo1/L NEt4 BF4/碳酸丙烯酯电解液体系中,其初始比电容达175F·g-1(电流强度0.6A·g-1),并在12A·g-1大电流密度下电容保持率高达94.2％.

Synthesis of 3D hierarchical porous carbon as an electrode material for electric double layer capacitors

A green and efficient method is presented to synthesize 3D hierarchical porous carbon from a metal organic framework(MOF) formed by 1,4-benzenedicarboxylic acid and zinc nitrate hexahydrate using glucose as the carbon precursor.Glucose was infiltrated into the external surface and/or voids of the cubic MOF,then polymerized and carbonized to form porous carbon.In the meantime,MOF was decomposed into ZnO,which was further reduced by carbon(or CO) into Zn that evaporated during carbonization.The morphology and pore characteristics of the products can be adjusted by changing the reaction time.When the synthesized porous carbon was used as the electrode material for electric double layer capacitors,it exhibited a high initial specific capacitance of 175 F · g-1 at 0.6 A · g-1 and a high capacitance retention of 94.2% at 12 A · g-1 in 1 mol/L NEt4BF4/propylene carbonate electrolyte.