一种高容量的层状Co-MOF基超级电容器电极材料

通过简单的溶剂热反应合成了一种钴基层状MOF（Co（4，4''-bpy）（tfbdc）（H₂O）₂]，Co-BTH，4，4''-bpy=4，4''-联吡啶，H₂tfbdc=四氟对苯二甲酸），并考察了其作为超级电容器电极材料的性能。研究结果表明：Co-BTH电极具有良好的赝电容性能，包含高比电容和较好的倍率性能。在1 A·g^-1电流密度下和1 mol·L^-1 KOH溶液中，其比电容最大可达2 316 F·g^-1。在2 A·g^-1的电流密度下，循环1 000次后，电极的比电容仍然还有847 F·g^-1。良好的赝电容性能与Co-BTH的层状结构和小尺寸的纳米片有关。

A Layered Co-MOF Based Electrode Material of Supercapacitor with High-Capacity

A cobalt-based MOF (Co(4,4''-bpy)(tfbdc)(H₂O)₂], Co-BTH, 4,4''-bpy=4,4''-bipyridune, H₂tfbdc=tetrafluo-roterephthalic acid) was synthesized by a simple solvothermal reaction, and its performance as the electrode material for supercapacitors was evaluated for the first time. The results show that Co-BTH electrode has good pseudocapacitance performance, including high specific capacitance and good rate performance. In 1 mol·L^-1 KOH solution, the maximum specific capacitance was 2 316 F·g^-1 at a current density of 1 A·g^-1. At the current density of 2 A·g^-1, the specific capacity of the electrode still kept 847 F·g^-1 after 1 000 cycles. The good pseudo-capacitance performance is related to the layered structure of Co-BTH and the small size nanosheets.