TY - JOUR
T1 - Correlating high temperature thin film ionomer electrode binder properties to hydrogen pump polarization
AU - Venugopalan, Gokul
AU - Bhattacharya, Deepra
AU - Kole, Subarna
AU - Ysidron, Cameron
AU - Angelopoulou, Polyxeni P.
AU - Sakellariou, Georgios
AU - Arges, Christopher G.
N1 - Publisher Copyright:
© 2021 The Royal Society of Chemistry.
PY - 2021/7/7
Y1 - 2021/7/7
N2 - 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.
AB - 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.
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U2 - 10.1039/d1ma00208b
DO - 10.1039/d1ma00208b
M3 - Article
AN - SCOPUS:85109256557
SN - 2633-5409
VL - 2
SP - 4228
EP - 4234
JO - Materials Advances
JF - Materials Advances
IS - 13
ER -