Hierarchical Two-Dimensional Conductive Metal–Organic Framework/Layered Double Hydroxide Nanoarray for a High-Performance Supercapacitor

Abstract

A novel hierarchical nanoarray material based on a two-dimensional metal-organic framework (Ni-CAT) and a layered double hydroxide (NiCo-LDH) was fabricated on a nickel foam substrate. By taking advantage of the regular nanostructure and making full use of the high porosity and excellent conductivity, the hybrid material exhibits a high areal capacitance for a supercapacitor (3200 mF cm at 1 mA cm).

Bottom‐Up Fabrication of 1D Cu‐based Conductive Metal–Organic Framework Nanowires as a High‐Rate Anode towards Efficient Lithium Storage

“…Meanwhile, one metal center coordinates with two adjacent deprotonated HHTP link-Conductive metal-organic frameworks (MOFs), as an ewly emerging multifunctional material, hold enormousp romise in electrochemical energy-storage systemso wing to their merits including good electronic conductivity,l arge surface area, appropriate pore structure, and environmental friendliness. [12] Although these pioneering works have confirmed the promising applications of these M-CAT-based conductive MOFs,t heir potential utilization as anode materials for LIBs has been scarcely investigated. The intrinsic Li storage mechanism of the Cu-CATelectrode was also explored.B enefiting from its structural virtues,t he resultant1 DC u-CATN Ws were endowedw ith superb Li + diffusionc oefficients and electrochemical conductivitiesa nd exhibited remarkably high-rate reversible capacities of approximately 631 mAh g À1 at 0.2 Ag À1 and even approximately 381 mAh g À1 at 2Ag À1 ,a long with striking capacity retention of 81 %a fter 500 cycles at 0.5 Ag À1 .…”

“…[11] Han and co-workers synthesized Ni-CATand layered double hydroxides on nickel foam as the electrode material andd iscoveredt hat the materiala chieves ah igh area capacitance of 3200 mF cm À2 . [12] Although these pioneering works have confirmed the promising applications of these M-CAT-based conductive MOFs,t heir potential utilization as anode materials for LIBs has been scarcely investigated. In addition, the involved charge-storage mechanisms of these conductive M-CATelectrodes need to be clarified for an in-depthu nderstanding of their electrochemical behaviors in high-performance LIBs.…”

Conductive 2D Metal‐Organic Frameworks Decorated on Layered Double Hydroxides Nanoflower Surface for High‐Performance Supercapacitor

“…Next, the Ni‐CAT nanocones were decorated onto the surface of flower petals. The possible binding mechanism maybe attribute to the Ni ion in solution were easily trapped by the surrounding hydroxides at the NiCo‐LDH interface, following the organic ligands coordinated to the Ni ions, gradually forming the Ni‐CAT nanocones . XRD results (Fig.…”

“…After decorated by Ni‐CAT (Figure c), the surface of flower petals becomes rugged, and several oriented short nanorods (about 100 nm high) are arranged neatly together into a small cone that vertically grown onto the NiCo‐LDH surface uniformly (Figure d), forming a unique interface structure, just like the surface microstructure of lotus leaves (Figure e‐f). Relative to pure Ni‐CAT nanorods and the hierarchical composites, the size of the Ni‐CAT nanocones becomes smaller and shorter, as well as the perfect and strong interfacial adhesion, all of which maybe benefit to maintain the structural stability.…”

“…al also reported a conductive 2D‐MOF (Cu–CAT, CAT= catecholate) nanowire arrays as solid‐state SC, which shows the high areal capacitance and rate performance in all reported MOF‐based SCs. While our group focused on the fabrication of hierarchical composites combined conductive 2D‐MOFs (Ni‐CAT nanorods, Figure S1) and LDHs nanosheets on Ni foam (NF) substrate (Scheme a). The as‐obtained hierarchical Ni‐CAT/NiCo‐LDH/NF nanoarray exhibits the improved areal capacitance for SC by making use of the regular nanostructure and taking full advantage of the high porosity.…”