Application of Ni/Co-based metal–organic frameworks (MOFs) as an advanced electrode material for supercapacitors

Abstract

A Ni/Co–MOF-based supercapacitor electrode exhibited high specific capacitance, and good rate and cycling performance.

Carbon‐wrapped Bimetallic Co/Ni Catalysts (C@CoxNi1−x) Derived from Co/Ni‐MOF for Bifunctional Catalysts in Rechargeable Zn‐Air Batteries

“…Into the void space, another framework is interpenetrated, which makes Co/Ni‐MOF a non‐porous solid. However, in the literature reporting the catalytic properties of Co/Ni‐MOF or [CoNi(μ 3 ‐tp) 2 (μ 2 ‐pyz) 2 ] itself, the MOF is described as a porous material with a BET surface area of 775 m 2 /g with an average pore diameter of 0.85 nm . Due to this ambiguity, we carefully compared the measured and simulated XRD patterns, and confirmed the strong peaks at 2θ = 14.1, 14.4, 18.0, 20.0, 22.4 and 25.2° for both patterns.…”

“…The morphologies of the Co/Ni‐MOF precursor and carbon‐wrapped Co/Ni catalysts, C@Co x Ni 1− x , are shown in Figure . The long and rectangular columnar Co/Ni‐MOF crystals have well‐defined surfaces . The original crystal shape was more or less retained in the pyrolysis products except for N900 where the precursor particles are fused together.…”

“…Recently, transition metal‐based catalysts have been synthesized using metal–organic frameworks (MOFs) as precursors especially for metal or metal oxide nanoparticles supported on porous carbons. Since metal ions are regularly spaced through organic linkers in MOFs, thermal composition under inert atmosphere can lead to facile formation of both metal or metal nanoparticles and carbon supports, which promotes the extensive application of these nanocomposites as electrode materials.super‐capacitors . We noted that while catalysts based on different transition metal ions are known, there are limited studies on the utilization of bimetallic MOFs as precursors for catalysts containing two metal species, especially Co and Ni .…”

“…Since metal ions are regularly spaced through organic linkers in MOFs, thermal composition under inert atmosphere can lead to facile formation of both metal or metal nanoparticles and carbon supports, which promotes the extensive application of these nanocomposites as electrode materials.super-capacitors. [19][20][21] We noted that while catalysts based on different transition metal ions are known, there are limited studies on the utilization of bimetallic MOFs as precursors for catalysts containing two metal species, especially Co and Ni. 22 Li et al reported the transformation of Co/Ni-MOF-74, prepared by using 2,5-dioxidoterephthalate instead of using 1,4-benzenedicarboxylic acid, to carbon-coated core-shell metal alloy@metal oxide solid solution,Co x Ni 1-x @Co y Ni 1-y O@C, by the calcination process for OER.…”

Improvement of capacitance activity for Cu‐doped Ni‐based metal–organic frameworks by adding potassium hexacyanoferrate into KOH electrolyte

“…There are two main reasons why MOFs can be directly used as electrode materials for supercapacitors. [19] In order to solve those problems, it is an effective strategy to construct MOF supercapacitor electrode materials with various metals. On the other hand, MOFs are crystalline materials, in which the structure is highly ordered, the active sites are uniformly dispersed and the exposed active sites are conducive to energy conversion.…”