Correlating high temperature thin film ionomer electrode binder properties to hydrogen pump polarization
| Autor: | Cameron Ysidron, Christopher G. Arges, Gokul Venugopalan, Deepra Bhattacharya, Georgios Sakellariou, Subarna Kole, Polyxeni P. Angelopoulou |
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| Rok vydání: | 2021 |
| Předmět: |
Materials science
Membrane electrode assembly Arylene Limiting current 02 engineering and technology Electrolyte 010402 general chemistry 021001 nanoscience & nanotechnology Electrochemistry 01 natural sciences 0104 chemical sciences chemistry.chemical_compound Chemical engineering chemistry Chemistry (miscellaneous) Electrode General Materials Science 0210 nano-technology Polarization (electrochemistry) Ionomer |
| Zdroj: | Materials Advances. 2:4228-4234 |
| ISSN: | 2633-5409 |
| Popis: | Ionomer electrode binders are important materials for polymer electrolyte membrane (PEM) fuel cells and electrolyzers and have a profound impact on cell performance. Herein, we report the effect of two different types of high-temperature (HT) ionomers, characterized as thin films (∼10 nm), on hydrogen oxidation/evolution reaction (HOR/HER) kinetics and hydrogen permeability using interdigitated electrode (IDE) platforms decorated with nanoscale platinum electrocatalysts. The two different ionomers studied were poly(tetraflurostyrene phosphonic acid-co-pentafluorostyrene) (PTFSPA) and quaternary benzyl pyridinium poly(arylene ether sulfone) imbibed with phosphoric acid (QPPSf-H3PO4). The reaction kinetics and limiting current values observed with thin film ionomers on IDEs were commensurate to the values observed in electrochemical hydrogen pumps (ECHPs) that use the ionomers as electrode binders. Using PTFSPA as the binder, an HT-PEM ECHP showed 1 A cm−2 at 55 mV when using 2 mgPt cm−2 in the membrane electrode assembly. |
| Databáze: | OpenAIRE |
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