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

Autor(es)

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]

Afiliação do(s) autor(es)

^[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

• Tipo de documento: Artigo Científico
• Fonte: MATERIALS SCIENCE AND ENGINEERING B-ADVANCED FUNCTIONAL SOLID-STATE MATERIALS; v. 266, APR 2021.
• Citações Web of Science: 0

Resumo

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)

• Processo FAPESP: 13/07296-2 - CDMF - Centro de Desenvolvimento de Materiais Funcionais
• Beneficiário: Elson Longo da Silva
• Modalidade de apoio: Auxílio à Pesquisa - Centros de Pesquisa, Inovação e Difusão - CEPIDs