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Organic template-free synthesis of an open framework silicoaluminophoshate (SAPO) with high thermal stability and high ion conductivity

Abstract : An open-framework silicoaluminophosphate (SAPO) material with a composition of Cs2(Al0.875Si0.125)4(P0.875Si0.125O4)4(HPO4) was synthesized in an organic template-free cesium-containing system under hydrothermal conditions. The material was resolved to be isostructural with an open-framework aluminophosphate (AlPO) material AlPO-CJ19, which was previously synthesized using pyridine as the solvent and 2-aminopyridine as the organic template via a solvothermal route. The substitution of organic templates by alkaline cations not only makes the current synthesis protocol more favorable from an environmental point of view but also leads to a significantly improved thermal stability of this structure. The framework is kept completely stable at a temperature of 510 oC. A high-temperature polymorph was discerned at a temperature higher than 540 oC, the structure of which is revealed to crystallize in P1c1 space group. UV-vis results reveal that cobalt and copper cations could be readily incorporated through simple ion-exchange treatment. The conductivity of the material is 1.70*10-4 S cm-1 (293K, 30% relative humidity) as revealed by the Alternating Current (A.C.) impedance spectroscopy analysis. This is the first report of the synthesis of silicon-containing phase with AlPO-CJ19 structure.
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Soumis le : jeudi 14 novembre 2019 - 12:33:08
Dernière modification le : jeudi 13 février 2020 - 09:34:42
Document(s) archivé(s) le : samedi 15 février 2020 - 15:05:22

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Dong Fan, Nicolas Barrier, Aurélie Vicente, Jean-Pierre Gilson, Simon Clevers, et al.. Organic template-free synthesis of an open framework silicoaluminophoshate (SAPO) with high thermal stability and high ion conductivity. Inorganic Chemistry Frontiers, Royal Society of Chemistry, 2020, 7, pp.542-553. ⟨10.1039/C9QI01223K⟩. ⟨hal-02363265⟩

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