RT Conference Proceedings
T1 Proton conductivity properties of tin(IV) N,Nbis( phosphonomethyl)glycine phosphonates and their pyrophosphate-based derivatives
A1 Cañamero-Cebrián, Fernando
A1 Galindo-Larrahondo, Jorge Armando
A1 Ramírez-Losilla, Enrique
A1 Pérez-Colodrero, Rosario Mercedes
A1 Bazaga-García, Montse
A1 Olivera-Pastor, Pascual
A1 Cabeza-Díaz, Aurelio
K1 Compuestos organofosforados
K1 Conductividad eléctrica
AB Metal phosphonates (MPs), a subclass of coordination polymers, are distinguished bytheir acidic functional groups, such as –P–OH, –SO₃H, and –COOH. Combined with theirchemical and thermal stability, commercial availability, and synthetic versatility, thesefeatures make MPs particularly appealing for fuel cell applications. They have shownremarkable potential not only as proton-conductive materials for proton exchangemembrane 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 ofamorphous 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, undopedand doped materials, were subjected to pyrolytic treatment at 750 °C in air, resultingpredominantly in tin(IV) pyrophosphates with slight compositional variations.All materials were thoroughly characterized with respect to their proton conductionproperties. The as-synthesized undoped material, SnBPMGLY, exhibited notableconductivity, 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, withvalues 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 aplots suggest a water-mediated Grotthuss proton transfer mechanism. Current efforts arefocused on evaluating the performance of these pyrolyzed materials at intermediatetemperature (125–300 °C) under high vapor pressure conditions.
YR 2025
FD 2025
LK https://hdl.handle.net/10630/39828
UL https://hdl.handle.net/10630/39828
LA eng
NO University of Malaga under Plan Propio de Investigación
NO Spanish Ministry of Economy, Industry and Competitiveness
DS RIUMA. Repositorio Institucional de la Universidad de Málaga
RD 19 ene 2026