Reliability of the spherical agglomerate models for catalyst layer in polymer electrolyte membrane fuel cells

Catalyst supports for polymer electrolyte fuel cells.

A major challenge in obtaining long-term durability in fuel cells is to discover catalyst supports that do not corrode, or corrode much more slowly than the current carbon blacks used in today's polymer electrolyte membrane fuel cells. Such materials must be sufficiently stable at low pH (acidic conditions) and high potential, in contact with the polymer membrane and under exposure to hydrogen ...

F FFC-NMR of Catalyst Layer Materials for Polymer Electrolyte Membrane Fuel Cells

1 H and 19 F spin lattice relaxation rates of catalyst layer materials (CLM) of polymer electrolyte membrane fuel cells were measured by the fast field cycling (FFC) method. In contrast to ionomer membranes, 1 H relaxation rates of adsorbed water in both platinumKetjen black (Pt-KB) catalyst powder and CLM were strongly dependent on Larmor frequency approximated by a power law due to the strong...

Proton Conductivity of Graphene-based Nafion® Catalyst Layer for Polymer Electrolyte Membrane Fuel Cell

Numerical analysis of reactant transport in the novel tubular polymer electrolyte membrane fuel cells

In present work, numerical analysis of three novel PEM fuel cells with tubular geometry was conducted. Tree different cross section was considered for PEM, namely: circular, square and triangular. Similar boundary and operational conditions is applied for all the geometries. At first, the obtained polarization curve for basic architecture fuel cells was validated with experimental data and then...

A review of the main mechanisms of catalyst layer degradation in polymer electrolyte membrane fuel cell (PEMFC) and different performance recovery methods

This paper reviewed over 100 articles on the subject of the mechanism of catalyst layer (CL) degradation and the effect of various contaminations in the polymer electrolyte membrane fuel cell (PEMFC). Also the recovery of PEMFC via different types of methods, the causes and fundamental mechanisms of cell degradation and their influence on long- term performance of PEM fuel cell were discussed i...