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Nafion
About: Nafion is a research topic. Over the lifetime, 9110 publications have been published within this topic receiving 320865 citations.
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TL;DR: In this paper, the authors compared direct methanol fuel cells (DMFCs) employing two types of Nafion{reg{underscore}sign} (EW) membranes of different equivalent weight (EW).
Abstract: This paper compares direct methanol fuel cells (DMFCs) employing two types of Nafion{reg{underscore}sign} (E.I.DuPont de Nemours and Company) membranes of different equivalent weight (EW). Methanol and water uptakes in 1,100 and 1,200 EW Nafion membranes were determined by weighing P{sub 2}O{sub 5}-dried and methanol solution-equilibrated membranes. Both methanol and water uptakes in the 1,200 EW membrane were about 70--74% of those in the 1,100 EW membrane. The methanol crossover rate corresponding to that in a DMFC at open circuit was measured using a voltammetric method in the DMFC configuration and under the same cell operating conditions. After accounting for the thickness difference between the membrane samples, the methanol crossover rate through a 1,200 EW membrane was 52% of that through an 1,100 EW membrane. To resolve the cathode and anode performances in an operating DMFC, a dynamic hydrogen electrode was used as a reference electrode. Results show that in an operating DMFC the cathode can be easily flooded, as shown in a DMFC using 1,100 EW membrane. An increase in methanol crossover rate decreases the DMFC cathode potential at open circuit. At a high cell current density, the DMFC cathode potential can approach that of a H{sub 2}/air cell.
385 citations
ENEA1
TL;DR: In this paper, a single cell configuration of polymer electrolyte fuel cells from SS316L end plate iron contamination was tested by means of pH measurements, conductivity, fluoride and metal concentration, showing that stainless steel is unsuitable as material for end plates in PEM fuel cells.
384 citations
TL;DR: In this article, the authors have reviewed several alternatives for the fabrication and evaluation of polymer electrolyte and composite membranes for fuel cell applications, including hybrid organic-inorganic composite membrane.
381 citations
TL;DR: Composite Nafion/zirconium phosphate membranes were investigated for high temperature operation of proton exchange membrane fuel cells (PEMFCs) in this article, where composite membranes were prepared via impregnation of Nafions with zirconyl chloride and 1 M phosphoric acid at 80°C.
381 citations
TL;DR: In this article, the effect of Nafion loading on the electrode polarization characteristics of a conventional proton exchange membrane (PEM) fuel cell electrode has been investigated in terms of both H 2/O2 and H2/air performance.
380 citations