2026-05-28T00:12:01Zhttps://riuma.uma.es/rest/oai/requestoai:riuma.uma.es:10630/168892026-02-03T12:11:51Zcom_10630_2254col_10630_37959
RIUMA. Repositorio Institucional de la Universidad de Málaga
author
López Vergara, Adrián
author
Salcedo, Inés R.
author
Bazaga-García, Montse
author
Olivera-Pastor, Pascual
author
Cabeza-Díaz, Aurelio
author
Losilla, Enrique R.
author
Porras-Vázquez, José Manuel
2018-11-15T12:17:32Z
2018-11-15T12:17:32Z
2018-11-15
https://hdl.handle.net/10630/16889
Metal phosphonates are promising precursors for applications such as proton conductivity [1] and catalysis [2]. Specifically, upon calcination metal polyphosphates are generated that can be used as non-noble metal alternatives [3] to the highly expensive commercial catalysts (Pt) for proton exchange membrane fuel cells (PEMFCs).
In this work, we present the synthesis and characterization of metal polyphosphates obtained from transition divalent metal phosphonates (M= Fe, Mn, Co and Zn) both as monometallic and bimetallic systems (solid solutions). For the preparation of the metal phosphonate precursors, two types of organic linkers were selected, i.e. 2-R,S-hydroxiphosphonoacetic acid [HO3PCH(OH)COOH, HPAA] and nitrilotrismethylenephosphonic acid [N(CH2PO3H2)3, ATMP]. The as synthesized compounds were calcined between 700 and 1000 ºC under N2. Depending on the metal/phosphorous molar ratio in the precursor phases, different compositions were found, the corresponding metal pyrophosphate being the major component according to the crystallographic data. Interestingly, in most of cases the solid solutions were preserved in the final product, for instance Fe-Mn, Fe-Co and Fe-Zn. All calcined materials have been also characterized by XPS, SEM/EDS, FTIR-Raman.
eng
Attribution-NonCommercial-NoDerivatives 4.0 Internacional
Química inorgánica
Synthesis and characterization of M(II) phosphonates (M = Fe, Co, Zn, Mn) as precursors for PEMFCs electrocatalysts
conference output
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