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Master's Dissertation
DOI
https://doi.org/10.11606/D.75.2023.tde-27102023-165758
Document
Author
Full name
Fabiana Matos de Oliveira
E-mail
Institute/School/College
Knowledge Area
Date of Defense
Published
São Carlos, 2023
Supervisor
Committee
Perez, Joelma (President)
Zignani, Sabrina Campagna
Faro, Massimiliano Lo
Title in Portuguese
Eletrocatalisadores de manganita de lantânio dopada com estrôncio modificados com Ni (LSMN) para oxidação de etanol em célula combustível de óxido de sólido
Keywords in Portuguese
eletroquímica
oxidação de etanol e perovskita
SOFC
Abstract in Portuguese
Neste trabalho desenvolveu-se um sistema de célula combustível de óxido de sólido (SOFC) do tipo cátodo aberto. Na interface do cátodo ocorre o contato entre o ar (ou oxigênio) e o eletrólito e no ânodo ocorre a oxidação do combustível, neste caso o etanol. Para a confecção do ânodo foram utilizadas duas configurações de células comerciais: i) cátodo de perovskita de manganita de lantânio dopada com estrôncio (LSM) e eletrólito de scandia, zirconia e céria (HIONICTM) e ii) cátodo de perovskita de manganita de lantânio dopada com cobalto (LSC), eletrólito de zircônia estabilizada com ítria (YSZ) e ânodo óxido de níquel com Gd0,1Ce0,9O2-δ (NiO-GDC/NiO). Estas células foram modificadas na superfície anódica com a perovskita de LSM modificada com 5% de Ni (LSMN) preparada por impregnação e tratamento térmico. Para comparação, as análises também foram realizadas na configuração 2, eletrólito YSZ, sem a modificação. O melhor desempenho para a oxidação do etanol com o ânodo LSMN foi obtido para célula LSC/YSZ com ânodo suportado, e esta também apresentou a maior durabilidade. Além disso, os sitemas com a cobertura de LSMN não apresentaram formação de carbono, coque, após os testes de durabilidade.
Title in English
Ni-modified strontium-doped lanthanum manganite electrocatalysts (LSMN) for ethanol oxidation in solid oxide fuel cell
Keywords in English
electrochemistry
ethanol and perovskite oxidation
SOFC
Abstract in English
This work developed a solid oxide fuel cell (SOFC) system. In the interphase of the cathode, there is contact between air (oxygen) and electrolyte, and in the anode, fuel oxidation occurs, in this case, ethanol. Two commercial cell configurations were used to make the anode: i) cathode, perovskite of lanthanum perovskite doped with strontium (LSM) and electrolyte, scandia zirconia and ceria (HIONICTM) and ii) cobalt-doped lanthanum (LSC) perovskite, yttria-stabilized zirconium (YSZ) electrolyte and nickel oxide with Gd0,1Ce0,9O2-δ (NiO-GDC/NiO), anode. These cells were modified on the anodic surface with LSM perovskite modified with 5% Ni (LSMN) prepared by impregnation and heat treatment. For comparison, the analyses were also performed in configuration 2, YSZ electrolyte, without LSMN modification. The best performance for ethanol oxidation with the LSMN anode was obtained for LSC/YSZ cell with supported anode, and this also presented the highest durability. In addition, the cells with LSMN coverage did not show carbon formation after durability tests.
 
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Release Date
2025-08-22
Publishing Date
2023-11-06
 
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