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Interfacial electrochemistry of graphitic carbon nitride nanosheet and polymelamine nanofilm: Toward integrated sensing and energy platforms.

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Title: Interfacial electrochemistry of graphitic carbon nitride nanosheet and polymelamine nanofilm: Toward integrated sensing and energy platforms.
Authors: Mathur, Neha1 (AUTHOR), Pachar, Kiran1 (AUTHOR), Ankita1 (AUTHOR), Yadav, Amit1 (AUTHOR), Roy, Partha1 (AUTHOR) partharoy@curaj.ac.in, Gupta, Pankaj1 (AUTHOR) pankaj.gupta@curaj.ac.in
Source: Electrochimica Acta. Nov2025, Vol. 539, pN.PAG-N.PAG. 1p.
Subjects: Electrochemistry, Electrocatalysts, Energy infrastructure, Hydrogen evolution reactions, Oxidation-reduction reaction, Signal detection, Polymers
Abstract: In response to the growing demand for metal-free catalytic electrode materials, this study explores the electrochemical behavior of graphitic carbon nitride nanosheets (g-C₃N₄ NS) and an electrochemically synthesized polymelamine (PMEL) nanofilm. Comprehensive characterization using X-ray diffraction, X-ray photoelectron spectroscopy, UV-Vis, and FTIR spectroscopy confirms the successful synthesis of g-C₃N₄ NS. Field-emission scanning electron microscopy verifies the uniform deposition of g-C₃N₄ NS and PMEL onto glassy carbon electrodes (GCE), producing modified electrodes: GCE/g-C₃N₄ NS, GCE/PMEL, and GCE/PMEL-g-C₃N₄ NS. Electrochemical studies using cyclic voltammetry and electrochemical impedance spectroscopy with a standard redox probe show that the PMEL-modified electrode has a significantly larger electrochemically active surface area and lower charge transfer resistance than its g-C₃N₄ counterpart, indicating improved electron transfer kinetics. Notably, GCE/PMEL exhibits superior redox activity and electrocatalytic performance for dopamine oxidation and hydrogen peroxide (H₂O₂) reduction, as demonstrated by square wave voltammetry and chronoamperometry. These techniques also reveal faster response times and higher sensitivity for PMEL in detecting both analytes. In the hydrogen evolution reaction (HER), GCE/PMEL shows a lower overpotential (630 mV) compared to GCE/g-C₃N₄ NS (661 mV) at 1 mA cm-2, underscoring PMEL's potential as a highly effective metal-free electrocatalyst. [Display omitted] [ABSTRACT FROM AUTHOR]
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Database: Engineering Source
Description
Abstract:In response to the growing demand for metal-free catalytic electrode materials, this study explores the electrochemical behavior of graphitic carbon nitride nanosheets (g-C₃N₄ NS) and an electrochemically synthesized polymelamine (PMEL) nanofilm. Comprehensive characterization using X-ray diffraction, X-ray photoelectron spectroscopy, UV-Vis, and FTIR spectroscopy confirms the successful synthesis of g-C₃N₄ NS. Field-emission scanning electron microscopy verifies the uniform deposition of g-C₃N₄ NS and PMEL onto glassy carbon electrodes (GCE), producing modified electrodes: GCE/g-C₃N₄ NS, GCE/PMEL, and GCE/PMEL-g-C₃N₄ NS. Electrochemical studies using cyclic voltammetry and electrochemical impedance spectroscopy with a standard redox probe show that the PMEL-modified electrode has a significantly larger electrochemically active surface area and lower charge transfer resistance than its g-C₃N₄ counterpart, indicating improved electron transfer kinetics. Notably, GCE/PMEL exhibits superior redox activity and electrocatalytic performance for dopamine oxidation and hydrogen peroxide (H₂O₂) reduction, as demonstrated by square wave voltammetry and chronoamperometry. These techniques also reveal faster response times and higher sensitivity for PMEL in detecting both analytes. In the hydrogen evolution reaction (HER), GCE/PMEL shows a lower overpotential (630 mV) compared to GCE/g-C₃N₄ NS (661 mV) at 1 mA cm-2, underscoring PMEL's potential as a highly effective metal-free electrocatalyst. [Display omitted] [ABSTRACT FROM AUTHOR]
ISSN:00134686
DOI:10.1016/j.electacta.2025.147131