A novel design and process for: a) a membrane electrode assembly with aligned carbon nanotubes as a nano-scale gas distributor which yield better gas conversion efficiencies in PEM fuel cells, and doped silicon flow field plates which increase electrode conductivity of the membrane-catalyst-gas diffusion layer -FFP interfaces of the proton exchange membrane fuel cell. The first substrate unit includes a first substrate and first electrodes. In one embodiment, a radio frequency reader device or tag can be associated with each container used to hold a plurality of mail items destined for a common delivery location.