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Gas diffusion layers (GDLs) play a crucial role in heat transfer and water management of cathode catalyst layers in polymer electrolyte fuel cells (PEFCs). Thermal and water gradients can accelerate electrocatalyst degradation and therefore the selection of GDLs can have a major influence on PEFC durability. Currently, the role of GDLs in electrocatalyst degradation is poorly studied. In this study,...
Platinum group metal (PGM)-free catalyst materials are promising alternatives to Platinum-based catalysts for use in polymer electrolyte fuel cells (PEFCs). The reduced cost and abundancy of the PGM-free catalyst materials can be potentially transformative. Catalytic activity, associated with atomically dispersed transition metal active sites, is intimately linked with the emerging morphology of the...
In this work pyrolyzed porphyrins were investigated for oxygen reduction electrocatalysis. Pyrolysis of non-supported cobalt and iron tetraphenylporphyrins in the temperature range of 500–800°C generates high surface area catalysts with high degree of exposure of active sites to the reacting species. This is achieved through templating porphyrins on fumed amorphous silica that is removed after pyrolysis...
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