Hydrangea‐like NiCo‐based Bimetal‐organic Frameworks, and their Pros and Cons as Supercapacitor Electrode Materials in Aqueous Electrolytes

Abstract

Hydrangea-like NiCo-based bimetal-organic frameworks (NiCo-MOF) are synthesized in DMF-EtOH solution via a solvothermal method, using 4,4Ј-biphenyldicarboxylic acid as a ligand. NiCo-MOF having a highest capacity of 1056.6 F·g -1 at 0.5 A·g -1 and 457.7 F·g -1 even at 10 A·g -1 is achieved at a Ni/Co/BPDC molar ratio of 1:1:1, a temperature of 170°C and a reaction time of 12 hours. It exhibits secondary 3D microsphere structures assembled by primary 2D nanosheet structures, good crystalline structure and good thermal stability below 350°C in air. All the electrochemical data show that NiCo-MOF has the pros and cons as supercapacitor electrode materials in aqueous electrolytes. On the one hand, NiCo-MOF has a high capacity even at a high current density, low internal resistance, charge-

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

“…In order to investigate chemical functional groups on the surface of composites, the FTIR spectra and Raman spectra of the HA−Na, NiCo‐BPDC and HA‐NiCo‐BPDC (1 : 1) composites are collected in Figure . In the FTIR spectra, the HA‐NiCo‐BPDC (1 : 1) has a couple of very strong absorption peaks at ∼1595 cm −1 and ∼1377 cm −1 similar to the HA−Na and NiCo‐BPDC, assigned to asymmetric and symmetric stretching vibrations of carboxylates from the BPDC and humates. The composites also exhibit a group of absorption peaks closely at 1181 cm −1 , 1104 cm −1 , 819 cm −1 , 762 cm −1 and 681 cm −1 similar to the NiCo‐BPDC, belonging to the typical absorption of aromatic rings .…”

MoP@C Supported on Absorbent Cotton as a Highly Efficient Catalyst towards Hydrodechlorination Reaction

“…Absorbent cotton has a natural rod‐like morphology, which can provide a carbon skeleton for MoP and help the catalyst to form a hollow rod structure, leading MoP@C to expose more active sites, thus helping to improve catalytic performance. Finally, the process of preparing the morphology modification catalyst in this work is easy to repeat, the synthesis steps are simple, and high temperature reactions are not required . Therefore, it may be applied to other catalysts as a morphology modification method.…”

Two‐dimensional MOFs: Design & Synthesis and Applications

“…The test results show that the asymmetric supercapacitor made of this material has high energy density, good rate performance and excellent cycle stability even at high power density, so it is a good choice for high performance supercapacitor electrode materials. Nevertheless, the research of Xiong's team shows that 2D NiCo‐MOF is not stable in aqueous electrolytes due to the hydrolysis of coordination bonds, especially in alkaline solutions [84] . In the future, we need to find suitable organic electrolytes to improve the cycle stability of 2D NiCo‐MOF.…”