MOF-derived Ni_xCo_1−x(OH)₂ composite microspheres for high-performance supercapacitors

Abstract

NixCo1−x(OH)2 composite microspheres are successfully synthesized with the assistance of alkali solution by employing a bimetallic Co–Ni–MOF as both the precursor and the self-sacrificing template, demonstrating excellent electrochemical performance.

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

“…[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. Moreover,w ithin appropriate potentialw indows, they can exhibit electrochemical faradaic reactions.…”

“…Notably,m icro-/mesoporous metal hydroxide materials can be prepared by using MOFs as templates for enhanced performance for SCs. [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.…”

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

“…Thus, the regular hexagonal nanosheets on the microsphere surface in Figure e can be deduced to be Ni(OH) 2 and Co(OH) 2 . Ni(OH) 2 and Co(OH) 2 are regarded as metal hydroxides possessing high pseudocapacitance , . Hence, the NiCo‐MOF derivatives have been produced in the cycling process and they present a lower capacity than NiCo‐MOF.…”

Co/CoOx Nanoparticles Embedded on Carbon for Efficient Catalysis of Oxygen Evolution and Oxygen Reduction Reactions

“…To gain ab etter understanding of the water oxidationc atalyst, we carried out structural characterization of the materials.T he XRD pattern of Co-MOF is different from that synthesized without adding polyvinylpyrrolidone (PVP), [23] but similar to that synthesized with PVP ( Figure 1a and Figure S1 in the Supporting Information). [24] The XRD patternso ft he series of Co@C-T materials synthesized at different pyrolysis temperatures (T)a re shown in Figure1b. The broad diffraction at 23.58 could be attributed to the typical (0 02)i ntermediate layer of the graphite carbon sheet,w hereas the peaks at around 44.28,5 1.58,a nd 75.88 were indexed to (111), (2 00), and (2 20)f acets of Co (PDF#:15-0806), respectively.…”