A 2D metal–organic framework/reduced graphene oxide heterostructure for supercapacitor application

Abstract

In this 2D NiCo-MOF/rGO hybrid, the MOF nanosheets provide abundant active sites while the conductive rGO provide rapid electron transport.

Ternary MOF-Based Redox Active Sites Enabled 3D-on-2D Nanoarchitectured Battery-Type Electrodes for High-Energy-Density Supercapatteries

“…The C 1 s spectrum (Fig. 3 h) in the NCM-based MOF nanoarchitectures exhibited three peaks in between 280 and 290 eV, which are ascribed to the bonds of C = C ( sp 2 ), C–C ( sp 3 ), and O–C = O, respectively [ 38 ]. The spectrum of O 1 s exhibited two peaks at the binding energy values of 526–534 eV which correspond to the metal–oxygen-metal (M–O–M) bonds and the oxygen in –OH of the prepared sample (Fig.…”

2D framework materials for energy applications

“…Thereby it is irrelevant whether the conductive additives are introduced post-synthetically or in situ during the synthesis. The latter was favoured by Beka et al 190 to deposit a 2-methylimidazole NiCo-2D MOF on rGO which results in a specific capacitance of 1553 F g −1 at a current density of 1 A g −1 . In addition, the assembled asymmetric device showed an excellent energy density of 44 W h kg −1 at a power density of 3168 W kg −1 .…”

Supercapacitor electrodes based on metal‐organic compounds from the first transition metal series

“…In the last decade, heterometallic organic compounds (especially bimetallic MOFs) and their composites ( 211 ‐ 264 ), also have aroused an increasing attraction due to their unique SC performances 26,37,66,76,203‐222 . Owing to the tunable structures resulting from the mole ratios of different metal centers, the properties of bimetallic organic compounds could be adjusted and thus novel and special applications can be obtained on the basis of the monometallic organic compounds 57 .…”

“…Bimetallic‐organic compounds with SC properties are mainly the bimetallic MOFs with either polycarboxylate ligands ( 221 ‐ 245 , 260 ‐ 264 ) 26,37,66,203‐216,222 or 3‐methylimidazole ( 246 ‐ 256 ) 217‐220 ligands. As shown in Tables 13 and 14, cobalt, nickel and zinc are the most popular metal elements used to fabricate SC electrodes based on bimetallic‐organic compounds.…”

“…Rahmanifar and coworkers prepared the composite ( 237 ) of Ni/Co‐MOF ( 236 ) and rGO, and the as‐assembled ASC device based on 237 realized a high energy density and power density of 72.8 Wh kg −1 and 42.5 kW kg −1 , respectively 213 . Beka and coworkers reported a series of 2D Ni/Co‐MOF ultrathin nanosheets/rGO hybrid electrode materials ( 251 ‐ 254 ) with different rGO doping weights, and the C g of composite 253 reached a high value of 1553 F g −1 219 …”