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000907595 0247_ $$2doi$$a10.1021/acs.chemmater.1c03819
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000907595 1001_ $$0P:(DE-Juel1)174599$$aHou, Hui$$b0
000907595 245__ $$aTuning Polybenzimidazole Membrane by Immobilizing a Novel Ionic Liquid with Superior Oxygen Reduction Reaction Kinetics
000907595 260__ $$aWashington, DC$$bAmerican Chemical Society$$c2022
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000907595 520__ $$aProtic ionic liquid (PIL) is a promising nonaqueous electrolyte alternative to replacing phosphoric acid for fuel cells operating at temperatures above 100 °C. In this study, the physical and electrochemical properties of stoichiometric and nonstoichiometric PILs are investigated focusing on their acid/base ratio. The study involves a series of PILs, generically indicated as N,N-diethyl-3-sulfopropane-1-ammonium trifluoromethanesulfonate ([DESPA+][TfO–]), varying from an excess of the proton acceptor (N,N-diethyl-3-aminopropane-1-sulfonic acid) to an excess of the proton donor (trifluoromethanesulfonic acid, TfOH). Compared to a state-of-the-art electrolyte, i.e., concentrated phosphoric acid, the nonstoichiometric [DESPA+][TfO–] shows superior oxygen reduction reaction kinetics on the investigated Pt catalysts and oxygen permeation ability (DO2·cO2). [DESPA+][TfO–] with a base-to-acid molar ratio of 1:2 achieves a current density ∼10 times larger than that of concentrated phosphoric acid at 110 °C and 0.8 V. Membranes including polybenzimidazole as a host polymer and stoichiometric and nonstoichiometric [DESPA+][TfO–] as the conductive electrolyte exhibit promising properties in terms of thermal stability and conductivity. At 120 °C and 40% relative humidity, conductivities of 2 and 16 mS cm–1 are achieved by the membranes employing stoichiometric and excess acid [DESPA+][TfO–], respectively.
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000907595 7001_ $$0P:(DE-HGF)0$$aMariani, Alessandro$$b1
000907595 7001_ $$0P:(DE-Juel1)172823$$aSuo, Yanpeng$$b2
000907595 7001_ $$0P:(DE-HGF)0$$aGao, Xinpei$$b3
000907595 7001_ $$0P:(DE-Juel1)129938$$aGiffin, Jürgen$$b4
000907595 7001_ $$0P:(DE-Juel1)142194$$aRodenbücher, Christian$$b5
000907595 7001_ $$0P:(DE-HGF)0$$aPasserini, Stefano$$b6$$eCorresponding author
000907595 7001_ $$0P:(DE-Juel1)140525$$aKorte, Carsten$$b7$$eCorresponding author
000907595 773__ $$0PERI:(DE-600)1500399-1$$a10.1021/acs.chemmater.1c03819$$gp. acs.chemmater.1c03819$$n10$$pacs.chemmater.1c03819$$tChemistry of materials$$v34$$x0897-4756$$y2022
000907595 8564_ $$uhttps://juser.fz-juelich.de/record/907595/files/Invoice._APC600313281pdf.pdf
000907595 8564_ $$uhttps://juser.fz-juelich.de/record/907595/files/Manuscript.pdf$$yPublished on 2022-05-03. Available in OpenAccess from 2023-05-03.
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