RT Conference Proceedings
T1 Sn(IV) Glyphosine Phosphonates as Precursor of Fast Proton Conductors based on SnP2O7
A1 Cabeza-Díaz, Aurelio
A1 Cañamero-Cebrián, Fernando
A1 Ramírez-Losilla, Enrique
A1 Marrero-López, David
A1 Olivera-Pastor, Pascual
A1 Pérez-Colodrero, Rosario Mercedes
K1 Compuestos organofosforados
K1 Electrólisis
AB Metal phosphonates (MPs) combine good chemical and thermal stability alongside tuneable properties, which provide appealing features for electrochemical applications [1-2]. They exhibit not only remarkable proton conductivity properties but also can be potential precursors of electrolytes. useable in intermediate-temperature fuel cells (ITFCs), operating at 100 - 250 ºC [3].In this work, we present the synthesis and characterization of a novel family of amorphous tin(IV) glyphosine-based phosphonates, Sn1-xMx[(O3PCH2)2-N-CH2CH2COOH)]1-x[(O3PCH2)2-NH-CH2CH2COOH]x n(H₂O) (M = Mg2+, Al3+; x < 0.3). Upon pyrolysis at 750 °C in air, these compounds were converted to the corresponding tin(IV) pyrophosphates and their proton conductivity properties measured. In comparison with the as-synthesized materials, that exhibited proton conductivities up to ~7·10⁻⁴ S/cm (90 °C and 95% RH), the resulting SnP2O7 derivatives showed values up to 1.3·10⁻² S/cm at the same conditions, with Ea < 0.12 eV characteristic of a water-mediated Grotthuss proton transfer mechanism (Figure 1). On the basis of solid-state 31P MAS-NMR studies, the proton conduction of these materials was found to be consistent with the formation of a core of crystalline tin(IV) pyrophosphate surrounded by an amorphous acidic phosphate-containing layer. Current efforts are focused on evaluating the performance of these materials in the range of 100 – 250 ºC and variable water vapor pressure. References[1] J. Jia, S. Bao, G.K.H. Shimizu, L. Zheng, Coord. Chem. Rev. 534 (2025) 216558.[2] Á. Vílchez-Cózar, R.M.P. Colodrero, M. Bazaga-García, D. Marrero-López, S.M. El-Refaei, P.A. Russo, N. Pinna, P. Olivera-Pastor, A. Cabeza, Appl. Catal. B 337 (2023), 122963[3] Z. Wang, J. Zhang, S. Lu, Y. Xiang, Z. Shao, S.P. Jiang, Adv. Sustainable Syst. 7 (2023) 2200432.
YR 2025
FD 2025
LK https://hdl.handle.net/10630/40011
UL https://hdl.handle.net/10630/40011
LA eng
DS RIUMA. Repositorio Institucional de la Universidad de Málaga
RD 22 ene 2026