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| Home > Publications database > Porous Transport Layers Made of Niobium/Steel Composites for Water Electrolysis |
| Conference Presentation (Other) | FZJ-2020-03924 |
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2020
Abstract: In future energy concepts, water splitting by polymer electrolyte membrane (PEM) electrolysis is a key technology for converting regenerative energy from wind or sun into hydrogen. In this study, a novel porous transport layer for PEM electrolysis units was developed, which is based on a stainless steel substrate coated with a porous Nb layer. Nb layer is expected to improve the electrochemical performance and lifetime of electrolysis cells due to formation of a stable passivation layer with good electrical conductivity. Scalable powder metallurgical techniques like tape casting, screen printing and field assisted sintering/spark plasma sintering FAST/SPS were used for manufacturing this composite structure. The porous transport layer was characterized with respect to microstructure. FAST/SPS was found to be promising to decrease interdiffusion at the interface. Finally, first electrochemical tests were conducted on laboratory scale demonstrating the potential of the composite to replace state-of-the-art titanium-based transport layers.
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