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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Correlation of catalytic oxidation and ionic conductivity properties of nanostructured gadolinium-doped ceria

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Author(s):
Godinho, Jr., Mario [1] ; Rodrigues, Murillo H. M. [1] ; Goncalves, Rosana de F. [1] ; Roca, Roman Alvarez [2] ; Longo, Elson [2] ; Mota, Fabiana Villela [3] ; Fajardo, Humberto V. [4] ; Balzer, Rosana [5]
Total Authors: 8
Affiliation:
[1] Univ Fed Goias, IFQ RC, BR-75704020 Catalao, Go - Brazil
[2] Univ Fed Sao Carlos, Chem Dept, CDMF, LIEC, BR-13565905 Sao Carlos, SP - Brazil
[3] Univ Fed Rio Grande do Norte, LSQM DEMAT, Campus Lagoa Nova, BR-59078900 Natal, RN - Brazil
[4] Univ Fed Ouro Preto, UFOP ICEB DEQUI, BR-35400000 Ouro Preto, MG - Brazil
[5] Univ Fed Parana, DEE UFPR, Dept Engn & Exatas, BR-85950000 Palotina, PR - Brazil
Total Affiliations: 5
Document type: Journal article
Source: MATERIALS SCIENCE AND ENGINEERING B-ADVANCED FUNCTIONAL SOLID-STATE MATERIALS; v. 266, APR 2021.
Web of Science Citations: 0
Abstract

This paper reports the relationship between ionic conductivity and catalytic activity of ionic conductors based on gadolinium-doped ceria (GDC) at different temperatures. The samples have been characterized by transmission electron microscopy techniques, and the results indicated a highly homogeneous particle size, which confirmed their nanometric size. Afterward, the structure determined using X-ray diffraction analysis has been used to analyze the effect of dopant insertion. Lastly, ionic conductivity data were obtained using the impedance technique and were compared with the conversion rates of volatile organic compounds using GDC heterogeneous catalysts. The samples containing 15% gadolinium presented higher catalytic activity for the oxidation of n-hexane (82,5%) as well as higher ionic conductivity at 400 degrees C (3.09 x 10(-4) S.cm(-1)). An attempt is made to correlate conductivity and catalytic oxidation in terms of oxygen mobility, vacancies, and superoxide formation. (AU)

FAPESP's process: 13/07296-2 - CDMF - Center for the Development of Functional Materials
Grantee:Elson Longo da Silva
Support Opportunities: Research Grants - Research, Innovation and Dissemination Centers - RIDC