CC BY 4.0Stelter, MichaelBalducci, AndreaBekisch, ArturArturBekisch2023-01-252023-01-252022urn:nbn:de:gbv:27-dbt-20221130-112231-006https://doi.org/10.24406/publica-740https://publica.fraunhofer.de/handle/publica/430925https://doi.org/10.24406/publica-74010.24406/publica-740The goal of this work was to propose a novel, long-term stable, bifunctional, carbon-free (CF-)GDE design for alkaline energy converters. This is achieved by understanding how the electrochemical activity of GDEs is affected by the pore size and the surface properties (hydrophobic and hydrophilic) of the electrode. In addition, combinations of different pore sizes and surface properties (hydrophobic and hydrophilic) and their influence on electrochemical activity will also be investigated. It is also necessary to understand the difference between the designed CF-GDE and the state-of-the-art carbon-based GDEref. The goal of proposing a novel, long-term stable, bifunctional CF-GDE design for alkaline energy converters was successfully achieved. The benchmark of the developed CF-GDE revealed that it is a competitive bifunctional GDE for metal-air batteries and unitized regenerative fuel cells and potentially for electrolyzers. Therefore, it is among the most advanced gas diffusion electrodes for alkaline applications.enBifunctionalGas Diffusion ElectrodeAlkaline Energy ConverterCarbon CorrosionNickel FoamPorosity GradientFuel CellMetal-Air BatteryElectrolyzerCarbon-freeOxygen EvolutionOxygen ReductionOERORRGDEDDC::500 Naturwissenschaften und Mathematik::540 Chemie::540 Chemie und zugeordnete Wissenschaftendoctoral thesis