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

For the construction of high-performance energy storage and conversion devices, the development of advanced electrode materials with specific nanostructural characteristics is a requirement of the moment. Several types of ZnCo 2 O 4 @Ni(OH) 2 nanoarchitectures are prepared in this study using a simple two-step hydrothermal strategy. At 1 A g –1, the observed capacitance of the ZnCo 2 O 4 @Ni(OH) 2 -2.0 sample-based hybrid capacitor was 848.6 C g –1 . The fabricated capacitor device exhibited not only high energy density but also an excellent cycling stability. As an electrocatalyst, the same sample, that is, ZnCo 2 O 4 @Ni(OH) 2 -2.0, demonstrates 280.2 mV over potential at 50 mA cm –2 . This research shows that the provided electrode material is well suited for future capacitor and electrocatalyst applications.