مؤتمر
Tuning Proton Conductivity in A Multifunctional Calcium Phosphonate Hybrid Framework
| العنوان: | Tuning Proton Conductivity in A Multifunctional Calcium Phosphonate Hybrid Framework |
|---|---|
| المؤلفون: | Cabeza-Díaz, Aurelio, Bazaga-García, Montse, Pérez-Colodrero, Rosario Mercedes, Papadaki, M., Olivera-Pastor, Pascual, Losilla, Enrique R., León-Reina, Laura, Choquesillo-Lazarte, Duane, Garczarek, Piotr, Zoń, J., García-Aranda, Miguel Ángel, Demadis, Konstantinos D. |
| سنة النشر: | 2014 |
| المجموعة: | RIUMA - Repositorio Institucional de la Universidad de Málaga |
| مصطلحات موضوعية: | Conductividad eléctrica, Metal phosphonates, Proton conductivity, Hybrid materials, Fuel cells, Functional materials, Inorganic-organic materials |
| الوصف: | Multi-chelating phosphonate ligands are organic linkers alternative to polycarboxylates and other ligands providing synthetic access to a number of thermally- and chemically-stable MOFs [1]. Metal phosphonates are amenable for accessing suitable and highly conducting materials both by tuning structural features and post-synthesis treatment [2,3]. For instance, proton conductivity values in the order of 10−2 S cm–1 have been reported for several phosphonate-based compounds [4]. We report hereby the synthesis, structural characterization and proton conductivity of an open framework hybrid, Ca2[(HO3PC6H3COOH)2]2[(HO3PC6H3(COO)2H).(H2O)2].5H2O, that combines Ca2+ ions and the rigid polyfunctional ligand 5-(dihydroxyphosphoryl)isophthalic acid. This compound was obtained by slow crystallization at ambient conditions at pH 3. Its complex pillared layered structure, solved by single crystal X-ray analysis, contains hydrophilic 1D channels filled with both water and acidic phosphonate and carboxylate groups creating a hydrogen-bonded network. Partial removal of the lattice water at 75 °C causes a monoclinic structural distortion but still retaining the initial conductivity properties (5.7x10-4 Sxcm-1). Exposure of the sample to ammonia vapor from a concentrated aqueous solution led to major structural changes resulting in a new layered material containing seven NH3 and sixteen H2O molecules per formula. This solid exhibits enhanced conductivity, reaching 6.6x10-3 S.cm-1, as measured at 98 % RH and T = 24 °C. Activation energies were between 0.23 and 0.40 eV, typical of a Grothuss mechanism of proton conduction. ; Universidad de Málaga. Campus de Excelencia Internacional Andalucía Tech. Proyecto Excelencia Junta de Andalucía, FQM-1656. MAT2010-15175. |
| نوع الوثيقة: | conference object |
| اللغة: | English |
| العلاقة: | 14th European Powder Diffraction Conference (EPDIC-14); Aarhus (Dinamarca); 15/06/2014; http://hdl.handle.net/10630/7726Test |
| الإتاحة: | http://hdl.handle.net/10630/7726Test |
| حقوق: | info:eu-repo/semantics/openAccess |
| رقم الانضمام: | edsbas.B8D553D0 |
| قاعدة البيانات: | BASE |
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