Journal
CERAMICS INTERNATIONAL
Volume 49, Issue 1, Pages 253-263Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.ceramint.2022.08.338
Keywords
Electrochemical hydrogen storage; Pyrochlore; Mixed-metal oxides; Solid state; X-ray diffraction
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A modified solid-state method was used to synthesize new SmRETi2O7 pyrochlores. The crystal system of the new pyrochlores was found to be cubic with Fd3m space group. The electrochemical hydrogen storage capacity of these pyrochlores was investigated, and the results indicated that the holmium-containing oxide structure exhibited a higher discharge capacity compared to other samples.
A modified solid-state method was used to synthesize new SmRETi2O7 pyrochlores. The new samples were characterized by powder X-ray diffraction (PXRD), scanning electron microscopy (SEM), energy dispersive x-ray (EDX), Fourier transform infrared (FT-IR) and Raman spectroscopy. Qualitative and quantitative analyses were done by MAUD software to obtain crystallographic parameters. Based on the results, the crystal system of the new SmRETi2O7 pyrochlores was cubic with Fd3m space group. A slight shift in the Bragg positions was observed which was related to the cationic radii of the rare earth cations. The correlation between the structural parameters and the crystallographic data was also done. Besides, the electrochemical hydrogen storage (EHS) capacity of these pyrochlores were investigated. The holmium-containing oxide structure (SmHoTi2O7) compared to other samples exhibited a higher discharge capacity, about 1340 mAh/g. The results of EHS studies well correlated with the crystallographic data.
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