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Insights into the combined effect of coupled CuFeO2/Fe3O4 heterostructured hybrid electrocatalyst for efficient hydrogen evolution in water splitting.

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Title: Insights into the combined effect of coupled CuFeO2/Fe3O4 heterostructured hybrid electrocatalyst for efficient hydrogen evolution in water splitting.
Authors: Anand Kumar, Sandhya1 (AUTHOR), John Kennedy, L.1 (AUTHOR) jksac14@yahoo.co.in
Source: International Journal of Hydrogen Energy. Dec2024, Vol. 96, p1101-1118. 18p.
Subjects: Platinum electrodes, Clean energy, Standard hydrogen electrode, Precious metals, Metal catalysts, Platinum, Oxygen evolution reactions, Hydrogen evolution reactions
Abstract: Hydrogen production via water electrolysis offers a promising route to sustainable energy, but the slow kinetics of the hydrogen evolution reaction (HER) demands efficient, cost-effective electrocatalysts to replace noble metals like platinum. We report a novel CuFeO₂/Fe₃O₄ (CD-SF) nanocomposite synthesized via microwave combustion featuring, heterostructure characterized by X-ray diffraction, X-ray photon spectroscopy, FESEM, and HRTEM. Electrochemical tests of CD-SF on nickel foam in 1 M KOH with Pt coil (Pt-CE) and graphite rod (Gr-CE) counter electrodes show outstanding HER catalytic activity. CD-SF(Pt-CE) achieved a low overpotential of 64.6 mV at current density 10 mA cm−2, with an exchange current density of 6.08 mA cm−2, while CD-SF(Gr-CE) reached 94.6 mV at 10 mA cm−2 with an exchange current density of 8.24 mA cm−2, outperforming many non-noble metal catalysts. Both catalysts exhibited high stability over 12 h of continuous hydrogen generation. This study highlights CD-SF's potential for large-scale industrial water splitting applications. Graphical illustration of three-electrode system with a unique heterostructured CuFeO 2 /Fe 3 O 4 electrocatalyst (developed in-situ via., MWC technique) coated on nickel foam as anode with Ag/AgCl as reference electrode and platinum coil/graphite rod as counter electrode showing excellent electrocatalytic activity for hydrogen evolution reaction in alkaline KOH medium. [Display omitted] • Low-cost CuFeO₂/Fe₃O₄ electrocatalyst synthesized via microwave combustion. • Cu–Fe cations offer abundant active sites, high conductivity, and enhanced HER performance. • Electrocatalyst's Overpotential: 64.6 mV (100% iR) outperforming with Pt vs graphite as counter electrodes. • High stability and durability for 12+ hours under high current densities for HER. • Counter electrode selection improves CuFeO₂/Fe₃O₄ performance for HER operation. [ABSTRACT FROM AUTHOR]
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Database: Engineering Source
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Abstract:Hydrogen production via water electrolysis offers a promising route to sustainable energy, but the slow kinetics of the hydrogen evolution reaction (HER) demands efficient, cost-effective electrocatalysts to replace noble metals like platinum. We report a novel CuFeO₂/Fe₃O₄ (CD-SF) nanocomposite synthesized via microwave combustion featuring, heterostructure characterized by X-ray diffraction, X-ray photon spectroscopy, FESEM, and HRTEM. Electrochemical tests of CD-SF on nickel foam in 1 M KOH with Pt coil (Pt-CE) and graphite rod (Gr-CE) counter electrodes show outstanding HER catalytic activity. CD-SF(Pt-CE) achieved a low overpotential of 64.6 mV at current density 10 mA cm−2, with an exchange current density of 6.08 mA cm−2, while CD-SF(Gr-CE) reached 94.6 mV at 10 mA cm−2 with an exchange current density of 8.24 mA cm−2, outperforming many non-noble metal catalysts. Both catalysts exhibited high stability over 12 h of continuous hydrogen generation. This study highlights CD-SF's potential for large-scale industrial water splitting applications. Graphical illustration of three-electrode system with a unique heterostructured CuFeO 2 /Fe 3 O 4 electrocatalyst (developed in-situ via., MWC technique) coated on nickel foam as anode with Ag/AgCl as reference electrode and platinum coil/graphite rod as counter electrode showing excellent electrocatalytic activity for hydrogen evolution reaction in alkaline KOH medium. [Display omitted] • Low-cost CuFeO₂/Fe₃O₄ electrocatalyst synthesized via microwave combustion. • Cu–Fe cations offer abundant active sites, high conductivity, and enhanced HER performance. • Electrocatalyst's Overpotential: 64.6 mV (100% iR) outperforming with Pt vs graphite as counter electrodes. • High stability and durability for 12+ hours under high current densities for HER. • Counter electrode selection improves CuFeO₂/Fe₃O₄ performance for HER operation. [ABSTRACT FROM AUTHOR]
ISSN:03603199
DOI:10.1016/j.ijhydene.2024.11.310