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Facile Synthesis of 3D NC-rGO@Ni-Foam Nanonetwork as a Binder-Free Hybrid Electrode Material for Ultrahigh Capacitance Applications

Year: 2025

Type: article

Abstract: High Resolution Image Download MS PowerPoint Slide In this study, a three-dimensional (3D) structured nanomaterial has been developed to enhance the electrochemical properties of supercapacitors. The nanomaterial’s structure was engineered by incorporating divalent metal ions (M 2+: Ni 2+ and Co 2+ ) into reduced graphene oxide (rGO) layers supported on nickel foam (3D NC-rGO@Ni-foam), forming a binder-free hybrid electrode. This was accomplished through a combination of in situ wet-chemistry and hydrothermal techniques. This binder-free electrode material has stacked layers of rGO, which improve conductivity, while the M 2+ ions intercalated between these layers function as redox couples, thereby significantly improving the specific capacitance. Furthermore, the Ni-foam substrate offers a porous configuration and works as the current collector. In contrast to traditional slurry coating methods, the in situ growth of nanostructures on Ni-foam is expected to enhance strong adhesion, high conductivity, and effective ion transport. The structural morphology, chemical composition, and electrochemical behavior of the 3D NC-rGO@Ni-foam electrode were comprehensively investigated using techniques such as scanning electron microscope (SEM), energy-dispersive X-ray spectroscopy (EDS), cyclic voltammetry (CV), galvanostatic charge–discharge (GCD), electrochemical impedance spectroscopy (EIS), and other analytical methods. This binder-free 3D hybrid electrode material demonstrated a specific capacitance ( C s ) of 2612 F/g at 1 A/g. The symmetric device fabricated also demonstrated a substantial energy density ( E ) of 55 W·h/kg and a power density ( P ) of 155 W/kg across a wide potential window of 2.5 V. The electrochemical characteristics and mechanical stability of 3D NC-rGO@Ni-foam indicate its potential as a high-performance electrode material for scalable energy storage systems.

Source: ACS Omega

DOI: 10.1021/acsomega.4c10988

Authors: Wen Sun, Mehmet Ozdogan, Nuri Oncel, Julia Xiaojun Zhao

Institution: University of North Dakota

Language: English

Topic: Supercapacitor Materials and Fabrication

Subfield: Electronic, Optical and Magnetic Materials

Field: Materials Science

Domain: Physical Sciences

SDGs: Affordable and clean energy, Industry, innovation and infrastructure

Open Access status: gold

Estimated APC paid: $1,935