Publication date: 22nd July 2026
Oxide ion conductors play a critical role in high-temperature electrochemical devices, particularly solid oxide fuel cells (SOFCs), where efficient oxygen ion transport and long-term stability are essential. In this work, we report the synthesis and systematic investigation of molybdenum-doped potassium zinc vanadate, K2ZnV2-xMoxO7+0.5x, as a novel oxide ion conducting material. The compounds were prepared via a conventional solid-state reaction route, enabling good densification and improved microstructural connectivity. Powder X-ray diffraction confirmed successful Mo⁶⁺ substitution at the V⁵⁺ site without secondary phase formation within the solubility limit, while Rietveld refinement revealed slight lattice distortion arising from aliovalent substitution. X-ray photoelectron spectroscopy verified the oxidation states of constituent elements and indicated the generation of oxygen-related defects to maintain charge neutrality. Electrical properties were evaluated using temperature-dependent electrochemical impedance spectroscopy over the range 300–600 °C. Nyquist analysis allowed clear separation of bulk and grain boundary contributions, and Mo-doped samples exhibited significantly enhanced total conductivity compared to the undoped composition. Frequency-dependent conductivity followed Jonscher’s universal power law, with the conduction mechanism well described by the correlated barrier hopping model, indicating oxygen ion migration via defect-assisted hopping. The enhanced conductivity is attributed to increased oxygen defect concentration and improved grain connectivity. Thermal cycling studies confirmed excellent structural and electrical stability. These results establish Mo-doped K₂ZnV₂O₇ as a promising electrolyte candidate for intermediate-temperature SOFCs and related electrochemical applications
References
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