ic9b02658_si_001.pdf (860.23 kB)

An Asymmetric Supercapacitor Based on a Non-Calcined 3D Pillared Cobalt(II) Metal–Organic Framework with Long Cyclic Stability

Download (860.23 kB)
journal contribution
posted on 14.11.2019 by Soheila Sanati, Reza Abazari, Ali Morsali, Alexander M. Kirillov, Peter C. Junk, Jun Wang
In this work, a new 3D metal–organic framework (MOF) {[Co34-tpa)3(μ-dapz)­(DMF)2]·2DMF}n (Co­(II)-TMU-63; H2tpa = terephthalic acid, dapz = pyrazine-2,5-diamine, DMF = dimethylformamide) containing low-cost and readily available ligands was generated, fully characterized, and used as an electrode material in supercapacitors without the need for a calcination process. Thus, the synthesis of this material represents an economical and cost-effective method in the energy field. The crystal structure of Co­(II)-TMU-63 is assembled from two types of organic building blocks (μ4-tpa2– and μ-dapz ligands), which arrange the cobalt nodes into a complex layer-pillared net with an unreported 4,4,4,6T14 topology. The presence of open sites in this MOF is promising for studying electrochemical activity and other types of applications. In fact, Co­(II)-TMU-63 as a novel electrode material when comparing with pristine MOFs shows great cycling stability, large capacity, and high energy density and so acts as an excellent supercapacitor (384 F g–1 at 6 A g–1). In addition, there was a stable cycling performance (90% capacitance) following 6000 cycles at 12 A g–1 current density. Also, the Co­(II)-TMU-63//activated carbon (AC) asymmetric supercapacitor acted in a broad potential window of 1.7 V (0–1.7 V), exhibiting a high performance with 4.42 kW kg–1 power density (PD) and 24.13 Whkg–1 energy density (ED). These results show that the pristine MOFs have great potential toward improving different high-performance electrochemical energy storage devices, without requiring the pyrolysis or calcination stages. Hence, such materials are very promising for future advancement of the energy field.

History

Exports