Electrodeposition of CoxNiVyOz Ternary Nanopetals on Bare and rGO-Coated Nickel Foam for High-Performance Supercapacitor Application

Abstract

We report a simple strategy to grow a novel cobalt nickel vanadium oxide (CoxNiVyOz) nanocomposite on bare and reduced-graphene-oxide (rGO)-coated nickel foam (Ni foam) substrates. In this way, the synthesized graphene oxide is coated on Ni foam, and reduced electrochemically with a negative voltage to prepare a more conductive rGO-coated Ni foam substrate. The fabricated electrodes were characterized with a field-emission scanning electron microscope (FESEM), energy-dispersive X-ray spectra (EDX), X-ray photoelectron spectra (XPS), and Fourier-transform infrared (FTIR) spectra. The electrochemical performance of these CoxNiVyOz-based electrode materials deposited on rGO-coated Ni foam substrate exhibited superior specific capacitance 701.08 F/g, which is more than twice that of a sample coated on bare Ni foam (300.31 F/g) under the same experimental conditions at current density 2 A/g. Our work highlights the effect of covering the Ni foam surface with a rGO film to expedite the specific capacity of the supercapacitors. Despite the slightly decreased stability of a CoxNiVyOz-based electrode coated on a Ni foam@rGO substrate, the facile synthesis, large specific capacitance, and preservation of 92% of the initial capacitance, even after running 5500 cyclic voltammetric (CV) scans, indicate that the CoxNiVyOz-based electrode is a promising candidate for high-performance energy-storage devices.

Construction of Non‐Precious Metal Self‐Supported Electrocatalysts for Oxygen Evolution from a Low‐Temperature Immersion Perspective

“…Nickel foam (NF) is the earliest and most widely used selfsupported material in electrocatalysis because of its porous structure, large specific surface area, high intrinsic strength, and high conductivity. [47][48][49][50][51][52][53][54][55] NF can be used not only as a substrate but also as a source of nickel to generate highperformance OER catalysts under the effect of etching, such as Ni 2 O 3 , Ni(OH) 2 , NiOOH, Ni 2 S 3 , etc. Guo et al [56] prepared a three-dimensional Fe-doped nickel hydroxide electrode (RTÀ Fe@Ni(OH) 2 ) with high current density for OER under room temperature corrosion (Figure 1a).…”

“…Nickel foam (NF) is the earliest and most widely used self‐supported material in electrocatalysis because of its porous structure, large specific surface area, high intrinsic strength, and high conductivity [47–55] . NF can be used not only as a substrate but also as a source of nickel to generate high‐performance OER catalysts under the effect of etching, such as Ni 2 O 3 , Ni(OH) 2 , NiOOH, Ni 2 S 3 , etc.…”