Potential application of reduced graphene oxide in electrocatalyst for hydrogen/oxygen evaluation reaction in water-splitting

IF 4.3 3区材料科学 Q2 MATERIALS SCIENCE, COATINGS & FILMS

Diamond and Related Materials Pub Date : 2025-02-15 DOI:10.1016/j.diamond.2025.112113

Jasveer Singh, Pawan K. Tyagi, Vinod Singh

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Abstract

The present study aims to develop a cost-effective bifunctional electrocatalyst having pronounced electrocatalytic activity at low activation energy barrier. Herein, we have synthesized reduced graphene oxide (rGO)-based electrocatalyst materials meticulously structurally characterized using X-ray diffraction (XRD), Raman spectroscopy, scanning electron microscopy (SEM), and Fourier transform infrared spectroscopy (FTIR). The electrochemical performance of catalyst has been examined by linear sweep voltammetry (LSV), Tafel slope, electrochemical impedance spectroscopy (EIS), and stability tests at different current densities in alkaline and acidic mediums. We demonstrate that the NiO-rGO composite exhibits excellent performance for hydrogen evaluation reaction (HER), attaining a current density of 10 mA/cm² @ stable overpotential of 290 mV, while for the oxygen evaluation reaction (OER) performance for rGO was outstanding and attained a current density of 10 mA/cm² @ overpotential of 272 mV. Furthermore, a prototype oxy‑hydrogen (HHO) generator was designed using NiO-rGO and rGO as working electrodes in acidic and alkaline mediums, respectively, and platinum as a counter electrode. The Faraday efficiency of the designed generator is found to be 16 % and 11 % at 11 V cell potential in acidic and alkaline mediums, respectively. We envision this study paving the way for developing of efficient and cost-effective a portable hydrogen generator.

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来源期刊

Diamond and Related Materials 工程技术-材料科学：综合

CiteScore

6.00

自引率

14.60%

发文量

702

审稿时长

2.1 months

期刊介绍： DRM is a leading international journal that publishes new fundamental and applied research on all forms of diamond, the integration of diamond with other advanced materials and development of technologies exploiting diamond. The synthesis, characterization and processing of single crystal diamond, polycrystalline films, nanodiamond powders and heterostructures with other advanced materials are encouraged topics for technical and review articles. In addition to diamond, the journal publishes manuscripts on the synthesis, characterization and application of other related materials including diamond-like carbons, carbon nanotubes, graphene, and boron and carbon nitrides. Articles are sought on the chemical functionalization of diamond and related materials as well as their use in electrochemistry, energy storage and conversion, chemical and biological sensing, imaging, thermal management, photonic and quantum applications, electron emission and electronic devices. The International Conference on Diamond and Carbon Materials has evolved into the largest and most well attended forum in the field of diamond, providing a forum to showcase the latest results in the science and technology of diamond and other carbon materials such as carbon nanotubes, graphene, and diamond-like carbon. Run annually in association with Diamond and Related Materials the conference provides junior and established researchers the opportunity to exchange the latest results ranging from fundamental physical and chemical concepts to applied research focusing on the next generation carbon-based devices.