Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 13, Issue 7, Pages 8370-8382Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.0c20679
Keywords
protic ionic liquid; fuel cell; Walden plot; oxygen reduction reaction; oxygen permeability
Funding
- Federal Ministry for Economic Affairs and Energy (HiFi-PEFC) [03ETB003A]
- Helmholtz Association
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This study demonstrates that certain protic ionic liquids show promising electrolyte performance in the temperature range of 100-120 degrees Celsius. In particular, [DEMSPA][TfO] and [DESPA][TfO] electrolytes exhibit high limiting current densities for the oxygen reduction reaction on platinum electrodes.
Herein we show that protic ionic liquids (PILs) are promising electrolytes for fuel cells operating in the temperature range 100-120 degrees C. N,N-Diethyl-N-methyl-3-sulfopropan-1-ammonium hydrogen sulfate ([DEMSPA][HSA]), N,N-diethyl-N-methyl-3-sulfopropan-1-ammonium triflate ([DEMSPA][TfO]), N,Ndiethyl-3-sulfopropan-1-ammonium hydrogen sulfate ([DESPA][ HSA]), and N,N-diethyl-3-sulfopropan-1-ammonium triflate ([DESPA][TfO]) are investigated in this study with regard to their specific conductivity, thermal stability, viscosity, and electro-chemical properties. The [DEMSPA][TfO] and [DESPA][TfO] electrolytes offer high limiting current densities for the oxygen reduction reaction (ORR) on platinum electrodes, that is, about 1 order of magnitude larger than 98% H3PO4. This is explained by the minor poisoning of the Pt catalyst and the significantly larger product of the oxygen self-diffusion coefficient and concentration in these two PILs.
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