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Comparing Sustainable and Conventional Methods for Synthesizing Copper Oxide Nanoparticles: Implications for Hydrogen Evolution.

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Titel: Comparing Sustainable and Conventional Methods for Synthesizing Copper Oxide Nanoparticles: Implications for Hydrogen Evolution.
Autoren: Alenezy, Ebtsam Khalefah, Ali, Ibraheem Othman, Hashem, Nady, Salama, Tarek Mohamed
Quelle: Catalysts (2073-4344); Sep2025, Vol. 15 Issue 9, p823, 20p
Schlagwörter: HYDROGEN evolution reactions, CATALYTIC activity, COPPER oxide, STRUCTURAL analysis (Science), SUSTAINABLE chemistry, BIOSYNTHESIS, ELECTROCHEMICAL experiments, SUSTAINABILITY
Abstract: This study explores the synthesis of copper oxide nanoparticles (CuO NPs) via green and conventional methods, with emphasis on their performance in hydrogen evolution reactions (HERs). CuO NPs synthesized using okra extract (CuOokra) and hydrazine hydrate (CuOhyd) were characterized using XRD, FTIR, SEM, HRTEM, and electrochemical techniques. Structural analysis revealed that CuOokra NPs have smaller crystallite sizes (39.8 nm) and higher defect densities than CuOhyd NPs (56.8 nm), while CuOhyd exhibited superior porosity and crystallinity. In HER studies, CuOhyd outperformed CuOokra, achieving a significantly lower overpotential (342.2 mV vs. 408.49 mV at 20 mA cm−2) and higher cathodic current density (15.9 vs. 11.3 mA cm−2 at −1.3 V). Electrochemical impedance spectroscopy (EIS) further confirmed the superior catalytic activity of CuOhyd NPs, showing minimal polarization resistance compared to CuOokra. [ABSTRACT FROM AUTHOR]
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Datenbank: Complementary Index
Beschreibung
Abstract:This study explores the synthesis of copper oxide nanoparticles (CuO NPs) via green and conventional methods, with emphasis on their performance in hydrogen evolution reactions (HERs). CuO NPs synthesized using okra extract (CuO<subscript>okra</subscript>) and hydrazine hydrate (CuO<subscript>hyd</subscript>) were characterized using XRD, FTIR, SEM, HRTEM, and electrochemical techniques. Structural analysis revealed that CuO<subscript>okra</subscript> NPs have smaller crystallite sizes (39.8 nm) and higher defect densities than CuO<subscript>hyd</subscript> NPs (56.8 nm), while CuO<subscript>hyd</subscript> exhibited superior porosity and crystallinity. In HER studies, CuO<subscript>hyd</subscript> outperformed CuO<subscript>okra</subscript>, achieving a significantly lower overpotential (342.2 mV vs. 408.49 mV at 20 mA cm<sup>−2</sup>) and higher cathodic current density (15.9 vs. 11.3 mA cm<sup>−2</sup> at −1.3 V). Electrochemical impedance spectroscopy (EIS) further confirmed the superior catalytic activity of CuO<subscript>hyd</subscript> NPs, showing minimal polarization resistance compared to CuO<subscript>okra</subscript>. [ABSTRACT FROM AUTHOR]
ISSN:20734344
DOI:10.3390/catal15090823