Cu@Fe-Redox Capacitive-Based Metal–Organic Framework Film for a High-Performance Supercapacitor Electrode

Abstract

A metal–organic framework (MOF) is a highly porous material with abundant redox capacitive sites for intercalation/de-intercalation of charges and, hence, is considered promising for electrode materials in supercapacitors. In addition, dopants can introduce defects and alter the electronic structure of the MOF, which can affect its surface reactivity and electrochemical properties. Herein, we report a copper-doped iron-based MOF (Cu@Fe-MOF/NF) thin film obtained via a simple drop-cast route on a 3D-nickel foam (NF) substrate for the supercapacitor application. The as-deposited Cu@Fe-MOF/NF electrodes exhibit a unique micro-sized bipyramidal structure composited with nanoparticles, revealing a high specific capacitance of 420.54 F g−1 at 3 A g−1 which is twice compared to the nano-cuboidal Fe-MOF/NF (210 F g−1). Furthermore, the asymmetric solid-state (ASSSC) supercapacitor device, derived from the assembly of Cu@Fe-MOF/NFǁrGO/NF electrodes, demonstrates superior performance in terms of energy density (44.20 Wh.kg−1) and electrochemical charge–discharge cycling durability with 88% capacitance retention after 5000 cycles. This work, thus, demonstrates a high potentiality of the Cu@Fe-MOF/NF film electrodes in electrochemical energy-storing devices.

Bifunctional imidazolium linked tetraphenylethene based conjugated microporous polymers for dynamic antibacterial properties and supercapacitor electrodes

“…33,34 Pseudocapacitors store energy through highly reversible redox interactions between electrolyte ions and electrode materials. 35 On the other hand, EDLCs primarily store energy at the electrode–electrolyte interface by adsorbing and desorbing charged ions. 36 The performance of supercapacitors is significantly influenced by the choice of materials for the electrodes.…”

Phenazine-integrated conjugated microporous polymers for modulating the mechanics of supercapacitor electrodes

“…Because of their exceptionally variable porosity, metalorganic frameworks (MOFs), conjugated microporous polymers (CMPs), and covalent-organic frameworks (COFs) are the developing polymers for supercapacitors as well as energy storage devices. [28][29][30][31][32] In fact, CMPs have properties distinct from those of other porous organic polymers because of their p-conjugated structures and microporous nature and a wide variety of potential building units. 33 CMPs have recently been found to display excellent performance in heterogeneous catalysis, photodegradation of dyes, photooxidative coupling of amines, oxidation of sulfides, hydrogen evolution (as photocatalytic materials), and supercapacitors (as electrodes).…”

Metal-ion doping in metal–organic-frameworks: modulating the electronic structure and local coordination for enhanced oxygen evolution reaction activity

“…[12][13][14][15] Of the various 3d transition-metal-based compounds investigated for OER catalysis, metal-organic frameworks (MOFs) are the emerging materials being studied in energy storage and conversion applications. [16][17][18][19][20][21][22] They are constructed by coordinating metallic ions with organic ligands, often containing amine or carboxylic moieties, that act as an electron donor or acceptor, typically the ligands having amine or carboxylic moiety. Due to flexibility in coordinating varieties of metal ions that provide redox-active catalytic sites with a wide variety a Division of Physics and Semiconductor Science, Dongguk University, Seoul-04620, Republic of Korea.…”