Nafion phosphonic acid composite membranes for proton exchange membranes fuel cells

• Published in: Applied surface science 2019-09, Vol.487, p.889-897
• Main Authors: Teixeira, Fátima C., de Sá, Ana I., Teixeira, António P.S., Rangel, C.M.
• Format: Article
• Language: English
• Subjects: Fuel cells; Nafion; Phosphonic acids; Proton conductivity; Proton exchange membranes
• ISSN: 0169-4332; 1873-5584
• DOI: 10.1016/j.apsusc.2019.05.078

In this work, new doped Nafion membranes with enhanced proton conductivity were prepared to be used as proton exchange membranes in fuel cells. New dopants derived from arylmono- or bisphosphonic acid were prepared and incorporated into the new membranes using impregnation or casting methods. Proton conductivities were assessed by Electrochemical Impedance Spectroscopy (EIS), at different temperatures and relative humidity (RH) conditions, in order to evaluate the influence of the structure and the method of the preparation on proton transport. The membranes prepared by casting showed higher proton conductivities than commercial Nafion membrane at all temperatures and relative humidity conditions studied. The [1,4-phenylenebis(hydroxymethanetriyl)]tetrakis(phosphonic acid) (BP2) showed the best proton conductivity with a value of 87 mS cm−1. The values obtained for the activation energy (Ea) for proton conduction suggests that transport occurs via both Grotthuss and vehicular mechanisms. [Display omitted] •New doped membranes were prepared with mono-or bisphosphonic acid compounds dopants.•Casted membranes showed higher proton conductivities than impregnated counterparts.•Casted membranes presented superior proton conductivities than commercial Nafion.•Proton conductivity best value achieved with a two biphosphonic acid groups dopant.