Abstract
4,5-Dicyano-1H-[1,2,3]-Triazole (DCTz) is a possible water replacement for proton transport in high temperature polymer electrolyte membranes since it exhibits a favorable proton affinity. In this study, some properties of DCTz doped with Trifluoromethanesulfonic Acid (TFMSA) and Heptadecafluorooctanesulfonic acid (C8HO3F17S-HDSA) are investigated. Thermal analysis as well as FTIR data indicated the formation of the salts. After proving to be stable up to 140°C, DCTz, DCTz_TFMSA and DCTz_HDSA salts were formed into membranes in a Polyacrylonitrile (PAN) polymeric binder. Thermogravimetric analysis (TGA) showed that adding the acid increases the stability of the membranes. Electrochemical measurements showed that the acid loading increases the conductivity of these polymeric membranes. Thus, a DCTZ_TFMSA doped PAN membrane has higher conductivity than a DCTZ doped PAN membrane over a temperature range of 20°C to 160°C at low relative humidity (RH). Similarly, increasing the weight % of DCTz_TFMSA in PAN membranes leads to an improved conductivity by an order of magnitude.
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