Integrated manufacturing of REciclable multi-material COmposites for the TRANSport sector
Cu–CeO2/YSZ electrodes for SOFCs: role of cermet meso/nanostructure in methane oxidation
The electrode microstructure in solid oxide fuel cells plays a significant role in transport and reaction phenomena. It requires interconnected pores for gas diffusion and a percolating network for efficient charge transport. Yttria-stabilized zirconia is a commonly used material for electrode scaffolds since it can be structured at the meso/nanoscale for improved performance, besides its high ionic conductivity, stability, and cost-effectiveness balance. However, electrode degradation remains challenging when supplied with hydrocarbons and requires further optimization. This study focuses on developing mesoporous yttria-stabilized zirconia as a precursor for a highly porous scaffold, and its infiltration with copper and cerium solution to obtain the metal-oxide composite Cu–CeO2/YSZ. Two types of symmetrical cells were constructed and analyzed: thin anode cells and thick anode cells. Thin anode cells were useful for selecting the best temperature for heat treatment of the YSZ scaffold, considering its effect on the electrode/electrolyte interface, grain interconnection, and infiltrated phase distribution, as well as how these microstructural features influence electrochemical performance in a methane atmosphere. Cell processing was then optimized by switching to thick anode cells, reducing the electrode resistance by an order of magnitude. These results were compared with those of an electrode scaffold fabricated from commercial YSZ, concluding that the powder mesostructure was crucial in improving electrode microstructure, reducing polarization resistance, and enhancing temporal stability in a direct methane-fueled cell.
Graphical abstract
» Publication Date: 30/09/2024
This project has received funding from the European Union's Horizon 2020 research and innovation programme under grant agreement Nº 768737
