Single chamber Solid Oxide Fuel Cells selective electrodes: A real chance with brownmillerite-based nanocomposites.
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| Title: | Single chamber Solid Oxide Fuel Cells selective electrodes: A real chance with brownmillerite-based nanocomposites. |
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| Authors: | Bedon, Andrea1,2 (AUTHOR) abedon@efestoinnovation.it, Viricelle, Jean Paul3 (AUTHOR), Rieu, Mathilde3 (AUTHOR), Mascotto, Simone4 (AUTHOR), Glisenti, Antonella1,2,5 (AUTHOR) antonella.glisenti@unipd.it |
| Source: | International Journal of Hydrogen Energy. Apr2021, Vol. 46 Issue 27, p14735-14747. 13p. |
| Subjects: | Solid oxide fuel cell electrodes, Solid oxide fuel cells, Microbial fuel cells, Nanocomposite materials, Heat treatment, Anodes |
| Abstract: | In this contribution brownmillerite-based nanocomposite cathode for Single-Chamber Solid Oxide Fuel Cells is developed. These cells can be very attractive especially for small and cheap devices because of the absence of seals. The efficiency of SC-SOFCs is strictly connected to the selectivity of anode and cathode, the bottleneck for this technology. The development of a cathode inert in fuel oxidation is particularly challenging. Our strategy is to start from a catalytically un-active support (CFA = Ca 2 FeAl 0.95 Mg 0.05 O 5) and induce the formation of iron oxide based nanoparticles, expected to activate oxygen. Symmetric (CFA + FeO x /CGO/CFA + FeO x) and complete cells (CFA + FeO x /CGO/Ni-CGO) are studied in air and methane/oxygen 2:1 mixture. The Area Specific Resistance of CFA + FeO x is less than 1/3 that of CFA. The high selectivity allows to reach an efficiency of 25%; power still needs to be increased but we demonstrated the possibility to develop selective low cost electrodes. The effect of air, methane/oxygen exposure and the heat treatments were carefully investigated. • Selective cathodes for Single Chamber Solid Oxide Fuel Cells successfully obtained. • Nanocomposites: iron based nanoparticles dispersed on Ca 2 FeAl 0.95 Mg 0.05 O 5 (FeOx + CFA). • Symmetric FeOx + CFA/CGO/FeOx + CFA and complete FeOx + CFA/CGO/Ni-CGO cells. • Cells are tested in air & CH 4 /O 2 mixture (1:2) converting 25% of the consumed fuel. • Very cheap and environmentally sustainable devices for renewable diffused energy. [ABSTRACT FROM AUTHOR] |
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| Database: | Engineering Source |
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