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Phase Transformation Dynamics in Sulfate-Loaded Lanthanide Triphosphonates. Proton Conductivity and Application as
Inés R Salcedo1, Rosario M P Colodrero1, Montse Bazaga-García1
1Departamento de Química Inorgánica, Cristalografía y Mineralogía, Universidad de Málaga, Campus de Teatinos s/n, Málaga-29071, Spain.
ACS Applied Materials & Interfaces
|March 25, 2021
Summary
New coordination polymers featuring lanthanide ions and nitrilo-tris(methylenephosphonic acid) exhibit high proton conductivity. These materials enhance performance in proton-exchange membrane fuel cells (PEMFCs) when used in composite membranes.
Area of Science:
- Materials Science
- Inorganic Chemistry
- Electrochemistry
Background:
- Proton conduction is crucial for fuel cell technology.
- Developing efficient proton conductors is an active research area.
- Coordination polymers offer tunable properties for energy applications.
Purpose of the Study:
- To synthesize and characterize novel lanthanide-based coordination polymers.
- To investigate their proton conduction properties.
- To evaluate their potential as fillers in proton-exchange membrane fuel cells (PEMFCs).
Main Methods:
- Synthesis of two series of lanthanide coordination polymers with nitrilo-tris(methylenephosphonic acid) and sulfate ions.
- Structural characterization using X-ray diffraction.
- Proton conductivity measurements under varying humidity and temperature.
- Fabrication and testing of Nafion-based composite membranes.
Main Results:
- Two families of cationic layer-featured coordination polymers were successfully synthesized and characterized.
- Materials exhibited high proton conductivity (10⁻³ to 10⁻² S·cm⁻¹).
- Composite membranes with these materials showed improved power and current densities in PEMFCs compared to pristine Nafion.
Conclusions:
- Lanthanide-based coordination polymers are promising proton conductors.
- These materials can enhance the performance of PEMFCs.
- The study demonstrates the potential of these materials for electrochemical energy applications.
