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Title: Synthesis of Co–Ni and Cu–Ni based-catalysts for dry reforming of methane as potential components for SOFC anodes
Authors: Cesario, Moisés R.
Souza, Glageane S.
Loureiro, Francisco J.A.
Araújo, Allan J.M.
Grilo, João P.F.
Aouad, Samer 
Tidahy, Haingomalala L.
Macedo, Daniel A.
Fagg, Duncan P.
Gennequin, Cédric
Abi-Aad, Edmond
Affiliations: Department of Chemistry 
Keywords: Cermet anode
Gadolinia-doped ceria (CGO)
Nickel alloy
One-step synthesis
Solid oxide fuel cell (SOFC)
Issue Date: 2021
Part of: Ceramics International
Volume: 47
Issue: 23
Start page: 33191
End page: 33201
In this work, we report a comparative study of Ni-based anode compositions, made of Cu and Co (40 and 80 mol%) and gadolinia-doped ceria (CGO) matrices, for application the dry reforming of methane (DRM) reaction using Solid Oxide Fuel Cells (SOFCs). The new compositions are synthesized by a one-step synthesis route, using citric acid as chelating agent, and characterized at three different stages: i) after synthesis, ii) after reduction, and iii) after DRM. X-ray diffraction (XRD) analysis combined with thermodynamic calculations is used to understand phase evolution along the different stages, revealing that complete solid solutions of NiCo- and NiCu-based alloys are formed after DRM reaction. Transmission Electron Microscopy (TEM) shows the formation of nanocrystalline powders, while surface area (SBET) measurements show higher values in the case of the NiCo-based samples. Moreover, the Co-containing compositions exhibit higher reducibility and stronger metal-ceramic interactions than the Cu-containing samples, according to the Temperature Programmed Reduction (TPR) results. Finally, DRM results demonstrate higher CO2 and CH4 conversions in the case of the Co-containing samples, as well as increased resistance towards carbon deposition, as confirmed by Thermogravimetric and Differential Scanning Calorimetry analyses (TG-DSC). Overall, the Co-based compositions are highly beneficial for their use as anodes for the CO2 reforming of methane in SOFCs.
ISSN: 02728842
DOI: 10.1016/j.ceramint.2021.08.220
Ezproxy URL: Link to full text
Type: Journal Article
Appears in Collections:Department of Chemistry

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