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28th Congress of SCTM

23–26 Sept 2026
Metropol Lake Resort
Europe/Zurich timezone

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Rietveld Structural Analysis and Electrocatalytic Activity of GdMn0.5M0.5O3 (M = Cr, Fe, Co, Ni, Cu) Double Perovskites toward Hydroxide Oxidation and Hydrogen Evolution Reactions

Not scheduled
10m
Metropol Lake Resort

Metropol Lake Resort

Naselba Dolno Konjsko bb, 6000 Ohrid, N. Macedonia
E-poster Physical, structural chemistry, spectroscopy and electrochemistry

Speaker

Besarta Cheliku Ramadani (University of Tetovo)

Description

GdMn0.5M0.5O3 (M = Cr, Fe, Co) double perovskites were synthesized via a glycine-assisted solution combustion method. Phase purity and crystal structure were confirmed by powder X-ray diffraction, while Rietveld refinement established the formation of single-phase orthorhombic structures within the Pnma space group, and Z = 4. Structural analysis revealed significant octahedral distortions, quantified through crystallochemical parameters including the global instability index.
Far-infrared spectroscopy (FIR) supported the structural results by showing characteristic metal–oxygen vibrational modes and systematic band shifts associated with lattice distortion. Scanning electron microscopy (SEM) revealed a porous combustion-derived morphology, while successive annealing treatments enhanced grain growth and microstructural homogeneity. Energy-dispersive X-ray spectroscopy (EDX) confirmed uniform elemental distribution close to the nominal composition.
Electrocatalytic performance was evaluated by cyclic voltammetry using perovskite modified paraffin impregnated graphite (PIGE) electrodes. The investigated materials exhibited composition-dependent activity toward hydroxide oxidation and hydrogen evolution reactions, with the Co-substituted sample showing the highest catalytic efficiency and good electrochemical stability.

Keywords: Perovskites, Solution combustion synthesis; Rietveld refinement; FIR, SEM/EDX, cyclic voltammetry

Author

Besarta Cheliku Ramadani (University of Tetovo)

Co-authors

Mr David Jovanov (cInstitute of Chemistry, Faculty of Natural Sciences and Mathematics, Ss. Cyril and Methodius University, Skopje, North Macedonia) Prof. Arianit Reka (Department of Chemistry, Faculty of Natural Sciences and Mathematics, University of Tetovo, Tetovo, North Macedonia) Mrs Jeta Sela (bDepartment of Chemistry, Faculty of Natural Sciences and Mathematics, University of Tetovo, Tetovo, North Macedonia) Dr Leon Stojanov (cInstitute of Chemistry, Faculty of Natural Sciences and Mathematics, Ss. Cyril and Methodius University, Skopje, North Macedonia) Prof. Miha Bukleski (cInstitute of Chemistry, Faculty of Natural Sciences and Mathematics, Ss. Cyril and Methodius University, Skopje, North Macedonia) Prof. Valentin Mirčeski (cInstitute of Chemistry, Faculty of Natural Sciences and Mathematics, Ss. Cyril and Methodius University, Skopje, North Macedonia) Slobotka Aleksovska (cInstitute of Chemistry, Faculty of Natural Sciences and Mathematics, Ss. Cyril and Methodius University, Skopje, North Macedonia)

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