Herein we show that protic ionic liquids (PILs) are promising electrolytes for fuel cells operating in the temperature range 100-120 °C. ,-Diethyl--methyl-3-sulfopropan-1-ammonium hydrogen sulfate ([DEMSPA][HSA]), ,-diethyl--methyl-3-sulfopropan-1-ammonium triflate ([DEMSPA][TfO]), ,-diethyl-3-sulfopropan-1-ammonium hydrogen sulfate ([DESPA][HSA]), and ,-diethyl-3-sulfopropan-1-ammonium triflate ([DESPA][TfO]) are investigated in this study with regard to their specific conductivity, thermal stability, viscosity, and electrochemical 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% HPO. 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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