This study is to look at the distribution of current densities in
proton exchange membrane fuel cells (PEMFC) to enable optimisation of fuel
cell performance. The feasibility of using a new measurement technique of
the local magnetic field, in the conductive plates of the cell was studied.
The magnetic field is measured throughout the cell using the Maxwell
equations and the current densities calculated. The measurement system and
its validation are outlined in the first section. The next section outlines
the experimental current density distribution within the cell, operating
under standard conditions and special configurations, such as the partially
active membrane electrodes assembly (MEA). Using a Matlab or Femlab model of
the cell, (which is briefly outlined) our experiments are compared and an
attempt made to explain the distribution of the current densities. Finally
recent developments of the device are described, which will be used in
several tests of PEMFC small stacks.