Abstract
A series of protic ionic liquids (ILs) were synthesized from N,N-diethylmethylamine (dema) and three kinds of imides having different fluoroalkyl chain lengths (H-N(SO2(CF2)nF)2, n = 0~2) as electrolytes for fuel cells. The effect of anion structure on the oxygen reduction reaction (ORR) activity of Pt electrode was investigated in detail using the prepared ILs. As increasing n of imide-anion, the ORR current was increased. The onset potential for ORR was also shifted towards the positive side as extending the fluoroalkyl chain of imide-anion. This potential shift was clearly revealed by in-situ FT-IR measurement to relate the anion adsorbability on the Pt electrode, depending on the fluoroalkyl chain length of imide structure.
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