Publication date: 10th April 2024
High temperature fuel cells (SOFC) are efficient and clean energy generation systems.
An important characteristic of these devices is that they can operate in reversible mode,
acting as electrolyzers (SOEC) for the generation of hydrogen. The use of surplus
electricity from renewable or continuous sources of electricity allows the production of
so-called green hydrogen (and oxygen), making them a key element in reducing the
carbon footprint of the global energy system. In this sense, these cells also allow,
through the coelectrolysis of CO2 and water, the production of other fuels widely used
industrially for the production, among others, of synthetic natural gas.
Achieving efficient and durable operation at low fabrication and operation costs is the
main challenge for the implementation of large scale high temperature electrolysis. We
explore here different strategies to reach this goal. On one hand, the optimization of air
electrodes is crucial in order to allow high density currents and we deal with the
addition of nanocatalysts on conventional LSM electrodes. On the other hand, we
explore the potential of the operation under pressurized conditions in order to increase
the efficiency through the decrease of the overvoltage contributions at cell level and
ease the integration on the whole system. Microtubular geometries overcome the poor
mechanical behaviour of flat membranes while facilitating easier sealing.
Key Words: Solid oxide fuel cells; Hydrogen production
Acknowledgments:
Grant TED2021-131267B-C32 funded by MCIN/AEI/ 10.13039/501100011033 and by
the European Union NextGenerationEU/PRTR.
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