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TPR-TPD-TPO studies on CGO/NiO and CGO/CuO ceramics obtained from freeze-dried precursors

Lookup NU author(s): Jaasiel Marrero Jerez, Arul Murugan, Professor Ian Metcalfe

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This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License (CC BY-NC 4.0).


Abstract

Nanocrystalline powders of Ce0.99Gd0.01O2-delta have been obtained at a very low temperature (400 degrees C) by a freeze-drying precursor method. Afterwards, ethanol solution of Ni or Cu nitrates were added to gadolinia doped ceria (CGO) by incipient wetness impregnation and then calcined in air at 650 degrees C in order to obtain CGO/NiO and CGO/CuO series of SOFC anode materials The resulting materials were characterized by X-ray Diffraction, N-2 adsorption-desorption (BET), Temperature Programmed Reduction (TPR), Temperature Programmed Desorption (TPD) and Temperature Programmed Oxidation (TPO) techniques. TPR showed wide overlapped peaks which are associated to the different reduction stages; firstly the reduction of highly dispersed metal oxide species took place and then the metal oxide bulk reduction process. After reduction of the CGO-metal powders, the metallic oxides were no longer present (as indicated by the presence of Ni or Cu), and the fluorite CGO solid solution remained stable. He-TPD tests showed that the series CGO/NiO adsorbed CO species on the material surface while CGO/CuO did not. O-2-TPO analysis showed that C deposition occurred during the CO-TPR on CGO/NiO samples but this did not occur for the CGO/CuO series. (C) 2014 Elsevier Ltd and Techna Group S.r.l. All rights reserved.


Publication metadata

Author(s): Marrero-Jerez J, Murugan A, Metcalfe IS, Núñez P

Publication type: Article

Publication status: Published

Journal: Ceramics International

Year: 2014

Volume: 40

Issue: 9

Pages: 15175-15182

Print publication date: 01/11/2014

Online publication date: 08/07/2014

Acceptance date: 30/06/2014

Date deposited: 23/10/2014

ISSN (print): 0272-8842

ISSN (electronic): 1873-3956

Publisher: Pergamon Press

URL: http://dx.doi.org/10.1016/j.ceramint.2014.06.132

DOI: 10.1016/j.ceramint.2014.06.132


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