A porous Co(OH)₂ material derived from a MOF template and its superior energy storage performance for supercapacitors

Abstract

A novel method was explored to synthesize porous Co(OH)2 using a Co-based metal–organic framework (MOF) as a template.

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

“…Moreover, a group of peaks at 12.3°, 24.9°, 29.5°, 35° and 38.4° are related with crystalline structure formed by the ordered arrangement of the HA−Na molecules. In five samples, there are a series of similar peaks at 2θ values of 6.1°, 12.4°, 14.1° 15.4°, 19.7°, 29.4° and 31.2°, attributed to the NiCo‐BPDC crystals . It reveals that the NiCo‐BPDC or Ni(Co)‐BPDC grown on the surface of humate layers owns a similar crystal structure to the pure NiCo‐BPDC or Ni(Co)‐BPDC.…”

“…MOFs are a porous crystalline material self‐assembled by coordination reactions between transition metal ions and organic ligands containing multiple carboxyl groups or nitrogen electrondonors . Multicarboxylic acids are the most‐widely‐used ligands in the synthesis of MOFs, in which 4,4′‐biphenyldicarboxylic acid (BPDC) is a dicarboxylic acid containing biphenyl structure and has been repeatedly used as MOFs’ ligand . The biphenyl structure entitles BPDC to construct flexible and variable MOFs as BPDC molecule can be twisted along the C−C bond connecting two benzene rings and coordinate with metal ions from different directions.…”

Recent Progress in Metal–Organic Frameworks and Their Derived Nanostructures for Energy and Environmental Applications

“…Moreover,w ithin appropriate potentialw indows, they can exhibit electrochemical faradaic reactions. [108,109] Moreover,i nc omparison with Co(OH) 2 nanomaterials obtained by other strategies, MOF-derived Co(OH) 2 nanostructures exhibit better electrochemical performance. [104][105][106][107] As reportedb yZ hang et al,C o(OH) 2 nanostructures can be facilely synthesized by using ZIF-67 as at emplate.…”

“…[104][105][106][107] As reportedb yZ hang et al,C o(OH) 2 nanostructures can be facilely synthesized by using ZIF-67 as at emplate. [108] The derived Co(OH) 2 nanostructures exhibit am esoporous structure and large surface area, whichc an shorten the charge-transfer distance, provide good electrolyte access, and enlarget he contact area between the active material and electrolyte. Therefore, such Co(OH) 2 nanomaterials display al arge capacitance (604.5 Fg À1 ), long cycling life, and good rate capability.T his facile strategy provides unlimited possibility to design highperformance metal hydroxide based electrodes for SCs.…”

Constructing Hollow Ni0.2Co0.8S@rGO Composites at Low Temperature Conditions as Anode Material for Lithium‐Ion batteries

“…As a porous coordination polymer, metalÀ organic frameworks (MOFs) exhibit enormous advantages for constructing hollow nanostructures, owing to their highly controllable structures, composition, and porosity. [27][28][29][30] Moreover, the free metal ions in the MOF or MOF derivatives can coordinate with the centers of hydroxyl, carboxyl, and epoxy groups on the graphene oxides (GO) nanosheets by metalÀ oxygen covalent bonding with strong electrostatic interaction, which can serve as the linkers attached to GO nanosheets for a rapid selfassembly. [31,32] In this work, zeolitic imidazolate framework (ZIF-67) was chosen as a template to synthesize the hollow cobalt-based bimetallic sulfide attached on reduced graphene oxide (Ni 0.2 Co 0.8 S @rGO) via a low temperature reflux and electrostatic self-assembly approach (Scheme 1).…”