Ni Foam Substrates Modified with a ZnCo₂O₄ Nanowire-Coated Ni(OH)₂ Nanosheet Electrode\nfor Hybrid Capacitors and Electrocatalysts

Abstract

For the construction of high-performance\nenergy storage and conversion\ndevices, the development of advanced electrode materials with specific\nnanostructural characteristics is a requirement of the moment. Several\ntypes of ZnCo₂O₄@Ni­(OH)₂ nanoarchitectures\nare prepared in this study using a simple two-step hydrothermal strategy.\nAt 1 A g^–1, the observed capacitance of the ZnCo₂O₄@Ni­(OH)₂-2.0 sample-based hybrid capacitor\nwas 848.6 C g^–1. The fabricated capacitor device\nexhibited not only high energy density but also an excellent cycling\nstability. As an electrocatalyst, the same sample, that is, ZnCo₂O₄@Ni­(OH)₂-2.0, demonstrates 280.2 mV\nover potential at 50 mA cm^–2. This research shows\nthat the provided electrode material is well suited for future capacitor\nand electrocatalyst applications.