Solid-solution driven metallic active sites in perovskite anodic layer for direct ethanol Solid Oxide Fuel Cell
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2024
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TOPICAL MEETING OF THE INTERNATIONAL SOCIETY OF ELECTROCHEMISTRY, 37th
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Resumo
Solid oxide fuel cells (SOFC) running on ethanol are emerging as an attractive power source for different
applications such as distributed power and mobility. Bioethanol is a widely available renewable fuel and
an interesting alternative carrier for carbon-neutral hydrogen due to easy storage and distribution. Such a
liquid fuel has a high energy density and has been considered as possible sustainable fuel for SOFCs.
Such features are extended to the new generation of metal-supported SOFC, which have been used in
ethanol-fueled prototype electrical vehicles. However, as with any carbon containing fuel, ethanol
imposes some challenges for its direct use in SOFC due to possible deactivation of the standard Ni-based
cermet anodes. Carbon deposition develops on the Ni nanoparticles if no oxidizing agent (usually, water)
is added to the fuel inlet. Stable operation of ethanol SOFC was demonstrated C by decoupling
the electrochemical and catalytic reactions by a catalytic layer deposited over the Ni cermet anode.
However, more widespread application of such systems requires lowering the operating temperature to
the 600-700C range. Nevertheless, such range is known to favor carbon formation and, thus, catalytic
active anodes are necessary for durable ethanol-SOFC.
As a prototype compound for the anode catalytic layer, the p-type electronic conductor lanthanum
chromite LaCrO3 perovskite is compatible with the SOFC components and exhibits high stability in both
reducing and oxidizing atmospheres at high temperature. Catalytic activity for the ethanol steam
reforming ESR was induced in lanthanum chromite ceramics by Ru species generated from solubilized
ionic ruthenium in defective sites of the surface of nanostructured LaCr1-xRuxO3 compounds. Singlephase
LaCr1-xRuxO3 (LCRu)
ESR. The effect of reducing conditions of LCRu on the catalytic properties of different ruthenium active
species was investigated by spectroscopic techniques such as synchrotron X-rays absorption and X-rays
photoelectron spectroscopy. The Ru-doped lanthanum chromite catalyst was applied as catalytic layer for
internal ethanol steam reforming in solid oxide fuel cells. The LCRu catalysts were optimized for
operating temperatures in the 600-700 °C range to promote stable ethanol reforming. The microstructure
of the deposited catalytic layer was controlled using pore formers with low burnout temperature. The
performance of the fuel cells was evaluated at 700 °C under hydrogen and dry ethanol. The LCRu
catalytic layer had no significant impact on the electrochemical properties of the fuel cells and samples
with catalytic layer or without it exhibited similar performance in hydrogen. Nonetheless, ethanol
durability tests have shown that the catalytic layer plays a crucial role for the stability of both the anode
and the metal supported SOFC. The experimental results indicate that controlling the reduction of the
solid solution dispersed ionic species in defective mixed-valence oxide surfaces is an efficient strategy to
generate highly active catalytic particles for reactions such as ethanol steam reforming in direct ethanol
SOFC.
Como referenciar
FONSECA, FABIO C.; MORAES, TAMARA. Solid-solution driven metallic active sites in perovskite anodic layer for direct ethanol Solid Oxide Fuel Cell. In: TOPICAL MEETING OF THE INTERNATIONAL SOCIETY OF ELECTROCHEMISTRY, 37th, June 9-12, 2024, Stresa, Italy. Abstract... Lausanne, Switzerland: International Society of Electrochemistry, 2024. Disponível em: https://repositorio.ipen.br/handle/123456789/48905. Acesso em: 30 Dec 2025.
Esta referência é gerada automaticamente de acordo com as normas do estilo IPEN/SP (ABNT NBR 6023) e recomenda-se uma verificação final e ajustes caso necessário.