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

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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 remained completely stable at a temperature of 510 °C. A high-temperature polymorph was discerned at a temperature higher than 540 °C, the structure of which is revealed to crystallize in the 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 (293 K, 30% relative humidity) as revealed by the alternating current (A.C.) impedance spectroscopy analysis. This is the first report of the synthesis of a silicon-containing phase with an AlPO-CJ19 structure.

Graphical abstract: Organic template-free synthesis of an open framework silicoaluminophosphate (SAPO) with high thermal stability and high ionic conductivity

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Article information


Submitted
23 Sep 2019
Accepted
11 Nov 2019
First published
12 Nov 2019

Inorg. Chem. Front., 2020, Advance Article
Article type
Research Article

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

D. Fan, N. Barrier, A. Vicente, J. Gilson, S. Clevers, V. Dupray, G. Coquerel and V. Valtchev, Inorg. Chem. Front., 2020, Advance Article , DOI: 10.1039/C9QI01223K

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