Electrochemical assessment of one-step Cu-CGO cermets under hydrogen and biogas fuels
| Autor: | Duncan P. Fagg, Francisco J.A. Loureiro, Daniel A. Macedo, Allan J.M. Araújo, João P.F. Grilo, Angel R.O. Sousa, Glageane S. Souza |
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| Rok vydání: | 2017 |
| Předmět: |
Materials science
Hydrogen SOFC anode Oxide Impedance spectroscopy chemistry.chemical_element 02 engineering and technology Cu-CGO 010402 general chemistry 01 natural sciences chemistry.chemical_compound General Materials Science Nanocomposite Rietveld refinement Mechanical Engineering Metallurgy Composite materials Cermet 021001 nanoscience & nanotechnology Condensed Matter Physics 0104 chemical sciences Anode Dielectric spectroscopy chemistry Chemical engineering Mechanics of Materials Electrical properties Crystallite 0210 nano-technology |
| Zdroj: | Repositório Científico de Acesso Aberto de Portugal Repositório Científico de Acesso Aberto de Portugal (RCAAP) instacron:RCAAP |
| ISSN: | 0167-577X |
| DOI: | 10.1016/j.matlet.2016.12.087 |
| Popis: | CuO-Ce 0.9 Gd 0.1 O 1.95 (CuO-CGO) nanocomposite powders obtained by in situ one-step synthesis were used to prepare Cu-CGO cermet anodes for solid oxide fuel cells (SOFCs). The effects of the CuO content (varying from 40 to 60 wt.%) on the lattice parameter and crystallite size of CuO and CGO phases were investigated by X-ray diffraction (XRD) with Rietveld refinement of the XRD data. CuO-CGO composites were screen-printed on both faces of ceria-based substrates, fired at 1150 °C, reduced to Cu-CGO cermets, and electrochemically characterized by impedance spectroscopy in hydrogen and synthetic biogas atmospheres. One-step Cu-CGO anodes with 40 wt.% CuO showed area specific resistances of 0.15 Ω.cm 2 (in hydrogen) and 2.30 Ω.cm 2 (in biogas) at 800 °C. The anode performance is deteriorated by increasing the CuO content to 60 wt.%. |
| Databáze: | OpenAIRE |
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