Rationally designed hierarchical ZnCo₂O₄/Ni(OH)₂ nanostructures for high-performance pseudocapacitor electrodes

Abstract

Hierarchical ZnCo2O4/Ni(OH)2 nanostructures were rationally designed and successfully fabricated. They show excellent electrochemical performances.

Nanostructured Electrode Materials Derived from Metal–Organic Framework Xerogels for High-Energy-Density Asymmetric Supercapacitor

“…9 Several nanomaterials have been synthesized in conquest towards designing efficient redox-active electrode materials such as RuO 2 , Co 3 O 4 , Fe 3 O 4 , Co(OH) 2 , FeOOH etc. [10][11][12][13][14] Despite the higher performance of those metallic nanostructured 3 electrodes, their cyclic performance is largely limited due to low active surface area and the increased aggregation of the nanomaterials upon cycling. 9,15 A widely accepted solution to this problem is to distribute the redox-active nanomaterials onto highly conductive and elastic substrates with high surface area, like porous carbon materials.…”

Ni(OH)2 Nanoflakes Supported on 3D Ni3Se2 Nanowire Array as Highly Efficient Electrodes for Asymmetric Supercapacitor and Ni/MH Battery

“…By these means accessible active sites, short ion transport pathways, advanced electron collection, and useful synergistic properties are created, resulting in simultaneous enhancement of capacitance, cycling stability, and rate performance . For instance, Ni(OH) 2 and other compounds, such as Co(OH) 2 , ZnCoO 4 , NiCo 2 O 4 , and Ni 3 S 2 were grown onto highly conductive supports, namely a carbon fiber paper, a 3D graphene network (3DGN) and a nickel foam (NF) to yield integrated array architectures with synergetic properties strongly expanding electrochemical performance of resulting materials. In particular, the Ni 3 S 2 @Ni(OH) 2 /3DGN composite exhibited much higher areal capacitance and better cycling performance than Co(OH) 2 @Ni(OH) 2 , ZnCoO 4 @Ni(OH) 2 , NiCo 2 O 4 @Ni(OH) 2 composites, owing to higher conductivity of Ni 3 S 2 alloy.…”

Hierarchical mesoporous Co3O4@ZnCo2O4 hybrid nanowire arrays supported on Ni foam for high-performance asymmetric supercapacitors

“…. 4 hybrid NWAs at a scan rate of 10 mV s −1 with a potential window from 0 to 0.6 V. Two pairs of redox peaks are observed for the Co 3 O 4 electrode, which is due to the Co 2+ /Co 3+ and Co 3+ /Co 4+ reactions [37]. For the hybrid electrode, the expanded peaks are mainly attributed to the Zn 2+ /Zn 3+ reaction [38]. These results suggest that the two electrodes are the typical battery-type electrode materials.…”