Breitwieser, MatthiasMatthiasBreitwieserBayer, T.T.BayerBüchler, AndreasAndreasBüchlerZengerle, RolandRolandZengerleLyth, S.M.S.M.LythThiele, SimonSimonThiele2022-03-052022-03-052017https://publica.fraunhofer.de/handle/publica/24913410.1016/j.jpowsour.2017.03.085A novel multilayer membrane electrode assembly (MEA) for polymer electrolyte membrane fuel cells (PEMFCs) is fabricated in this work, within a single spray-coating device. For the first time, direct membrane deposition is used to fabricate a PEMFC by spraying the short-side-chain ionomer Aquivion directly onto the gas diffusion electrodes. The fully sprayed MEA, with an Aquivion membrane 10 mm in thickness, achieved a high power density of 1.6 W/cm2 for H2/air operation at 300 kPaabs. This is one of the highest reported values for thin composite membranes operated in H2/air atmosphere. By the means of confocal laser scanning microscopy, individual carbon fibers from the gas diffusion layer are identified to penetrate through the micro porous layer (MPL), likely causing a low electrical cell resistance in the range of 150 O cm2 through the thin sprayed membranes. By spraying a 200 nm graphene oxide/cerium oxide (GO/CeO2) interlayer between two layers of Aquivion ionomer, the impact of the electrical short is eliminated and the hydrogen crossover current density is reduced to about 1 mA/cm2. The peak power density of the interlayer-containing MEA drops only by 10% compared to a pure Aquivion membrane of similar thickness.enSolarzellen - Entwicklung und CharakterisierungPhotovoltaikSilicium-PhotovoltaikCharakterisierung von Prozess- und Silicium-MaterialienMikrocharacterisierung621journal article