2026-05-29T23:01:19Zhttps://riuma.uma.es/rest/oai/requestoai:riuma.uma.es:10630/398282026-02-03T12:12:43Zcom_10630_2254col_10630_37959
RIUMA. Repositorio Institucional de la Universidad de Málaga
author
Cañamero-Cebrián, Fernando
author
Galindo-Larrahondo, Jorge Armando
author
Ramírez-Losilla, Enrique
author
Pérez-Colodrero, Rosario Mercedes
author
Bazaga-García, Montse
author
Olivera-Pastor, Pascual
author
Cabeza-Díaz, Aurelio
2025-09-10T11:40:41Z
2025-09-10T11:40:41Z
2025
https://hdl.handle.net/10630/39828
Metal phosphonates (MPs), a subclass of coordination polymers, are distinguished by
their acidic functional groups, such as –P–OH, –SO₃H, and –COOH. Combined with their
chemical and thermal stability, commercial availability, and synthetic versatility, these
features make MPs particularly appealing for fuel cell applications. They have shown
remarkable potential not only as proton-conductive materials for proton exchange
membrane fuel cells (PEMFCs), but also as precursors to metal diphosphate-based proton conductors suitable for intermediate-temperature fuel cells (ITFCs), between 100 and 300 ºC.
In this work, we present the synthesis and characterization of a novel family of
amorphous tin(IV) phosphonates, Sn[(COOH-CH2)N((CH2-PO(OH)2)2](OH)0.8 (H₂O)3
(SnBPMGLY); doped with variable amounts (0.1 - 0.3) of Al3+ or Mg2+ ions. Both, undoped
and doped materials, were subjected to pyrolytic treatment at 750 °C in air, resulting
predominantly in tin(IV) pyrophosphates with slight compositional variations.
All materials were thoroughly characterized with respect to their proton conduction
properties. The as-synthesized undoped material, SnBPMGLY, exhibited notable
conductivity, reaching up to 5.05 × 10⁻⁴ S·cm-1, at 90 °C and 95% relative humidity (RH).
After pyrolysis, the resulting tin pyrophosphates showed higher proton conductivities, with
values up to 1.3 × 10⁻² S·cm-1 in the case of Sn0.8Al0.2BPMGLY Δ750 ºC under the same
conditions. The low activation energy values (E < 0.35 eV) determined from the Arrhenius a
plots suggest a water-mediated Grotthuss proton transfer mechanism. Current efforts are
focused on evaluating the performance of these pyrolyzed materials at intermediate
temperature (125–300 °C) under high vapor pressure conditions.
eng
Compuestos organofosforados
Conductividad eléctrica
Proton conductivity properties of tin(IV) N,Nbis( phosphonomethyl)glycine phosphonates and their pyrophosphate-based derivatives
conference output
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