Proton Conductive Zr-Phosphonate UPG-1-Aminoacid Insertion as Proton Carrier Stabilizer

Proton exchange membrane fuel cells (PEMFCs) are an attractive green technology for energy generation. The poor stability and performances under working conditions of the current electrolytes are their major drawbacks. Metal-Organic Frameworks (MOFs) have recently emerged as an alternative to overco...

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Bibliographic Details
Published in:Molecules (Basel, Switzerland) Switzerland), 2020-07, Vol.25 (15), p.3519
Main Authors: Vilela, Sérgio M F, Salcedo-Abraira, Pablo, Gómez-Peña, Alejandro, Trens, Philippe, Várez, Alejandro, Salles, Fabrice, Horcajada, Patricia
Format: Article
Language:English
Subjects:
Adsorption
Amino acids
Chemical Sciences
Clean energy
Clean technology
Composite materials
Computer applications
Conductivity
Electrolytes
Electrolytic cells
Fuel cells
Fuel technology
Humidity
Hydrophobic and Hydrophilic Interactions
Hydrophobicity
ion conductivity
Lysine
Lysine - chemistry
Metal-Organic Frameworks
Metal-Organic Frameworks - chemistry
Organophosphonates - chemistry
Phosphonates
Porosity
proton carriers
Proton exchange membrane fuel cells
Protons
Sorption
Spectroscopy
Spectrum analysis
Stability
Temperature
Thermogravimetry
Water - chemistry
Working conditions
Zinc - chemistry
Zirconium
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Summary:Proton exchange membrane fuel cells (PEMFCs) are an attractive green technology for energy generation. The poor stability and performances under working conditions of the current electrolytes are their major drawbacks. Metal-Organic Frameworks (MOFs) have recently emerged as an alternative to overcome these issues. Here, we propose a robust Zr-phosphonate MOF (UPG-1) bearing labile protons able to act as an efficient electrolyte in PEMFCs. Further, in an attempt to further enhance the stability and conductivity of UPG-1, a proton carrier (the amino acid Lysine, Lys) was successfully encapsulated within its porosity. The behaviors of both solids as an electrolyte were investigated by a complete experimental (impedance spectroscopy, water sorption) and computational approach (MonteCarlo, water sorption). Compared with the pristine UPG-1, the newly prepared Lys@UPG-1 composite showed similar proton conductivity but a higher stability, which allows a better cyclability. This improved cyclability is mainly related to the different hydrophobic-hydrophilic balance of the Lys@UPG-1 and UPG-1 and the steric protection of the reactive sites of the MOF by the Lys.
ISSN:1420-3049
1420-3049
DOI:10.3390/molecules25153519