A single cell with a 100 cm² active area (explosion diagram depicted in Fig. was customised specifically for through-plane neutron imaging experiments, with the membrane electrode assembly (MEA) oriented perpendicular to the neutron beam. The endplates, having a thickness of 25 mm, were made from aluminium to mitigate neutron absorption and anodised to enhance electrical insulation. Silicon sheets interposed between the endplate and the gold-coated current collector plate provided further electrical isolation. The 6-mm thick graphite flow-field plates were machined with multiple serpentine flows, featuring 7 channels and 6 bends. The channel dimensions were as follows: channel width -1 mm, channel depth -1 mm, and rib width -1 mm.