Wang Kuaibing, Li Qingqing, Ren Zhujuan, Li Chao, Chu Yang, Wang Zikai, Zhang Mingdao, Wu Hua, Zhang Qichun
Department of Chemistry, College of Sciences, Nanjing Agricultural University, Nanjing, Jiangsu, 210095, P. R. China.
School of Materials Science and Engineering, Nanyang Technological University, Singapore, 639678, Singapore.
Small. 2020 Jul;16(30):e2001987. doi: 10.1002/smll.202001987. Epub 2020 Jun 25.
Two identical layered metal-organic frameworks (MOFs) (CoFRS and NiFRS) are constructed by using flexible 1,10-bis(1,2,4-triazol-1-yl)decane as pillars and 1,4-benzenedicarboxylic acid as rigid linkers. The single-crystal structure analysis indicates that the as-synthesized MOFs possess fluctuant 2D networks with large interlayer lattices. Serving as active electrode elements in supercapacitors, both MOFs deliver excellent rate capabilities, high capacities, and longstanding endurances. Moreover, the new intermediates in two electrodes before and after long-lifespan cycling are also examined, which cannot be identified as metal hydroxides in the peer reports. After assembled into battery-supercapacitor (BatCap) hybrid devices, the NiFRS//activated carbon (AC) device displays better electrochemical results in terms of gravimetric capacitance and cycling performance than CoFRS//AC devices, and a higher energy-density value of 28.7 Wh kg compared to other peer references with MOFs-based electrodes. Furthermore, the possible factors to support the distinct performances are discussed and analyzed.
通过使用柔性的1,10 - 双（1,2,4 - 三唑 - 1 - 基）癸烷作为支柱和1,4 - 苯二甲酸作为刚性连接体，构建了两种相同的层状金属有机框架（MOF）（CoFRS和NiFRS）。单晶结构分析表明，合成的MOF具有具有大层间晶格的波动二维网络。作为超级电容器中的活性电极元件，两种MOF都具有出色的倍率性能、高容量和长期耐久性。此外，还研究了长寿命循环前后两个电极中的新中间体，这些中间体在同行报告中不能被鉴定为金属氢氧化物。组装成电池 - 超级电容器（BatCap）混合装置后，NiFRS//活性炭（AC）装置在重量电容和循环性能方面比CoFRS//AC装置显示出更好的电化学结果，并且与其他基于MOF电极的同行参考文献相比，具有更高的28.7 Wh kg的能量密度值。此外，还讨论和分析了支持不同性能的可能因素。
