Nickel-based pillared MOFs for high-performance supercapacitors: Design, synthesis and stability study

Abstract

We have successfully synthesized novel, nickel-based, pillared DABCO-MOFs (DMOFs) of similar topologies-[Ni(L)(DABCO) 0.5 ], where L is the functionalized BDC (1,4benzenedicarboxylic acid) linker and DABCO is 1,4-diazabicyclo[2.2.2]-octane. The stability of DMOF-ADC ([Ni(9,10-anthracenedicarboxylic acid)(DABCO) 0.5 ]) and DMOF-TM ([Ni(2,3,5,6tetramethyl-1,4-benzenedicarboxylic acid)(DABCO) 0.5 ]) in a humid environment was confirmed by surface area analysis on the water-exposed samples. When used as electrode materials, these DMOF capacitors exhibited excellent electrochemical performance. For example, a Ni-DMOF-ADC electrode showed specific capacitances of 552 and 438 F g-1 at current densities of 1 and 20 A g-1 , respectively, while maintaining outstanding cycling stability (capacitance retention of >98% after 16,000 cycles at current density of 10 A g-1) for MOF-derived materials based supercapacitors. The excellent electrochemical performance is attributed to the conversion of DMOFs to highly functionalized nickel hydroxide which inherited the high stability of DMOF-ADC and remained intact during charge-discharge process. Further, this work provides a general approach for the application of nickel-based pillared MOFs as relatively stable electrode in electrical energy storage.

Hydrothermal Synthesis of Humate‐Layer‐Based Bimetal Organic Framework Composites as High Rate‐Capability and Enery‐Density Electrode Materials for Supercapacitors

“…Owing to homogeneous structures integrating porosity and transition metal ions, MOFs are a promising alternative material of carbon/metal oxide composites . Unfortunately, most MOFs have poor capacitance stability during the charge/discharge process due to poor conductivity, which limits their applications in electrode materials . As reported, growing on the graphene oxide (GO) or carboxylated CNTs substrates is an effective strategy to enhance conductivity and capacitance stability of MOFs through synergistic effects .…”

Edge‐Abundant Porous Fe3O4 Nanoparticles Docking in Nitrogen‐Rich Graphene Aerogel as Efficient and Durable Electrocatalyst for Oxygen Reduction

“…Metal‐organic frameworks (MOFs), consisting of metal ions or clusters coordinated to organic ligands to form two‐ or three‐dimensional structures, have been widely studied as template or platform to prepare smart nanostructured materials such as honeycomb‐like, hollow, and core/shell materials for energy storage and conversion due to their remarkable surface areas, facilely tunable pore size, and peculiar structures. Herein, we applied MOFs as sacrificial templates to prepare rich‐edged Fe 3 O 4 nanoparticles and N‐doped graphene aerogel (NGA) composite through a simple pyrolysis of an iron‐based MOF/NGA composite under argon.…”

Improvement of capacitance activity for Cu‐doped Ni‐based metal–organic frameworks by adding potassium hexacyanoferrate into KOH electrolyte

“…[10] Due to the obvious surface area and the easily adjustable pore size, MOFs have attracted much attention as potential electrodes for supercapacitors. [13][14][15][16][17][18] Unfortunately, the single-metal MOFs as electrode materials reported at present have many disadvantages such as low specific capacitance, poor conductivity and poor stability. [11,12] On the one hand, MOFs have abundant interpenetrating pore structures that facilitate the transport of electrons and ions.…”