Layered Structural Co‐Based MOF with Conductive Network Frames as a New Supercapacitor Electrode

Abstract

Layered structural Co-MOF nanosheets were synthesized and then used as an electrode material for supercapacitors for the first time. This material exhibited a high specific capacitance, a good rate capability, and an excellent cycling stability. A maximum capacitance of 2564 F g can be achieved at a current density of 1 Ag . Moreover, the capacitance retention can be kept at 95.8 % respectively of its initial value after 3000 cycles. To the best of our knowledge, both the specific capacitance and the capacitance retention were the highest values reported for MOF materials as supercapacitor electrodes until now. Such a high supercapacitive performance might be attributed to the intrinsic characteristics of this kind of Co-MOF material, including its layered structure, conductive network frame, and thin nanosheet.

Synthesis of Bimetallic Conductive 2D Metal–Organic Framework (CoxNiy‐CAT) and Its Mass Production: Enhanced Electrochemical Oxygen Reduction Activity

“…Catalytic activity of the as‐prepared Co x Ni y ‐CATs (specifically Co 0.27 Ni 0.73 ‐CAT) in the ORR was first tested by cyclic voltammetry (CV) in a 0.1 m NaClO 4 and 0.02 m PBS electrolyte solution using a three‐electrode system. The electrical conductivity of electrocatalysts is an important factor because good conductivity should accelerate the electron transfer during the reaction and thus enhance the electrocatalytic activity . Therefore, people often prepared the catalyst ink by mixing the catalyst with a commercial carbon black to improve the electrical conductivity .…”

Structural Engineering of Low‐Dimensional Metal–Organic Frameworks: Synthesis, Properties, and Applications

“…[310] Moreover, the Co-BDC MOF nanosheets showed good cycling stability with 95.8% retention of the initial capacitance after 3000 cycles at a current density of 2 A g −1 . For instance, Wei and co-workers reported the synthesis of layer-stacked Co-BDC MOF nanosheets, which exhibited a maximum capacitance of 2564 F g −1 at a current density of 1 A g −1 .…”

Exposing {001} Crystal Plane on Hexagonal Ni‐MOF with Surface‐Grown Cross‐Linked Mesh‐Structures for Electrochemical Energy Storage

“…According to the working mechanism of supercapacitors, electrode materials are classified into carbon materials (electric‐double‐layer capacitors) and pseudocapacitor electrode materials including metal sulfide, metal oxides, metal selenide, metal hydroxide, conductive polymers, and so on, which mainly store energy by reversible redox reactions. Recently, rapidly growing MOF materials have achieved extensive specific surface area, large pore volume, and uniform pore dispersions, which can provide potential electrode candidates for SCs . The supercapacitive application of MOF can be mainly classified into two types.…”