Akademik Veri Yönetim Sistemi
International Journal of Hydrogen Energy, cilt.196, 2025 (SCI-Expanded, Scopus)
This study investigates the hydrogen production performance of the CoNi/Fe3O4@GNR nanocomposite and explores its potential for environmental and biomedical applications. The structure and morphological analysis of the CoNi/Fe3O4@GNR nanocomposite is thoroughly examined using XRD, FTIR, FESEM, and TEM analyses. The XRD analysis of CoNi/Fe3O4@GNR confirms the inverse spinel crystal structure of Fe3O4 and the successful integration of the GNR layer; the presence of hydroxyl groups on the surface supports the hydrophilic character and active surface area of the composite. TEM and FESEM images reveal Co–Ni nanoparticles homogeneously distributed on GNR with locally aggregated Fe3O4 phases, exhibiting a catalytically advantageous, multi-component, heterogeneous structure. Furthermore, EDX analysis confirms the presence of C, Fe, O, Co, and Ni elements consistent with the nominal composition. Furthermore, catalytic activity studies of the CoNi/Fe3O4@GNR nanocomposite using NaBH4 hydrolysis kinetic studies indicate that the catalyst has a low energy barrier with an activation energy (Ea) of 16.64 kJ/mol. The thermodynamic parameters during NaBH4 hydrolysis are calculated as enthalpy (ΔH) 14.08 kJ/mol and entropy (ΔS) −99.96 J/mol·K. The obtained nanocomposite exhibits high catalytic activity in the removal of organic dyes that cause environmental pollution, with degradation efficiencies of 90.46 % and 87.93 % against methylene blue (MB) and rhodamine B (RhB), respectively. In addition, the antibacterial tests of the nanocomposite are being tested on both gram-negative and gram-positive bacteria. The results obtained reveal the potential of CoNi/Fe3O4@GNR in renewable energy applications and environmental sustainability.