2D Metal–Organic Frameworks (MOFs) for High‐Performance BatCap Hybrid Devices
2020; Wiley; Volume: 16; Issue: 30 Linguagem: Inglês
10.1002/smll.202001987
ISSN1613-6829
AutoresKuaibing Wang, Qingqing Li, Zhujuan Ren, Chao Li, Yang Chu, Zikai Wang, Ming‐Dao Zhang, Hua Wu, Qichun Zhang,
Tópico(s)Advancements in Battery Materials
ResumoTwo 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-1 compared to other peer references with MOFs-based electrodes. Furthermore, the possible factors to support the distinct performances are discussed and analyzed.
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