Contribution of Nafion loading to the activity of catalysts and the performance of PEMFC

Material development and process optimization for gas-phase hydrogen chloride electrolysis with oxygen depolarized cathode

“…In addition the negative influence of a high Nafion Ò content in the higher current density regime observed in half-cell experiments is also visible in the present experiments. Furthermore, the influence of the Nafion Ò content on the catalyst activity for the ORR postulated by Xie et al [29] and Lai et al [30] is also adaptable to this process. These authors showed that high ionomer content (28.8 wt%) leads to an improved performance at low current densities although the performance declines at higher current densities.…”

The Gas Diffusion Layer in High Temperature Polymer Electrolyte Membrane Fuel Cells

“…The gas must diffuse within the gas diffusion layer, to achieve the catalytic layer, and then, inside this, the gas must access to the active catalyst sites. These catalyst sites are usually covered by a certain amount of electrolyte (Lai et al, 2008;Lobato et al, 2010a), and hence, the reactant gases and the products must also diffuse through it, complicating, even more, the mass transfer processes. Figure 2 shows a typical concentration/partial pressure profile of a PEMFC.…”

Evaluation of polymer electrolyte membrane fuel cells by electrochemical impedance spectroscopy under different operation conditions and corrosion

“…Yuan et al [1] reported EIS has already become a primary tool in PEMFC research. EIS method is also used effectively for analyses of the amount of catalysts [2][3][4][5], nafion content [3,[6][7][8], membrane thickness [9,10], GDL structure [11][12][13][14][15][16][17][18][19], proton conductivity [20][21][22][23][24][25][26], humidification condition [3,9,[27][28][29][30] and stack [24,[31][32][33][34][35][36]. For example, Paganin et al [2] and Song et al [3] suggested that charge transfer resistance is much smaller with increasing amount of catalysts.…”