Characterization and electrochemical performance of CeO2 and Eu-doped CeO2 films as a manganese redox flow battery component
来源期刊：JOURNAL OF RARE EARTHS2018年第10期
论文作者：Mnica A.Rodrigues Ariadne C.Catto Elson Longo Edson Nossol Renata C.Lima
文章页码：1074 - 1083
摘 要：Hexagonal CeO2 and Eu-doped CeO2 nanoparticles were obtained using a facile microwave-hydro thermal method under mild conditions and their application towards manganese redox flow battery component were studied. The structural properties were studied by X-ray diffraction and indicate that samples present a fluorite structure. Raman spectroscopy shows Eu3+ ions substitute Ce4+ and generate oxygen vacancies. Electrochemical properties of pure and Eu-doped CeO2 films deposited at graphite substrates investigated by cyclic voltammetry and galvanostatic charge—discharge indicate that dopant concentration affects the electrochemical properties of CeO2. The increase in the reversibility redox of electrochemical systems observed is attributed to coexistence of Ce4+/Ce3+ redox couple confirmed by XPS.Charge—discharge tests display coulombic and voltage efficiency values of above 80% and 90%, respectively. The obtained specific capacity for Ce0.99Eu0.01O2（372.49 mAh/g） and pure oxide（334.84 mAh/g）indicates that both samples are promising for application in Mn-batteries.
Mnica A.Rodrigues1，Ariadne C.Catto2，Elson Longo3，Edson Nossol1，Renata C.Lima1
1. Institute of Chemistry, Federal University of Uberlandia2. Institute of Chemistry,Sao Paulo State University3. LIEC,Department of Chemistry,Federal University of Sao Carlos
摘 要：Hexagonal CeO2 and Eu-doped CeO2 nanoparticles were obtained using a facile microwave-hydro thermal method under mild conditions and their application towards manganese redox flow battery component were studied. The structural properties were studied by X-ray diffraction and indicate that samples present a fluorite structure. Raman spectroscopy shows Eu3+ ions substitute Ce4+ and generate oxygen vacancies. Electrochemical properties of pure and Eu-doped CeO2 films deposited at graphite substrates investigated by cyclic voltammetry and galvanostatic charge—discharge indicate that dopant concentration affects the electrochemical properties of CeO2. The increase in the reversibility redox of electrochemical systems observed is attributed to coexistence of Ce4+/Ce3+ redox couple confirmed by XPS.Charge—discharge tests display coulombic and voltage efficiency values of above 80% and 90%, respectively. The obtained specific capacity for Ce0.99Eu0.01O2（372.49 mAh/g） and pure oxide（334.84 mAh/g）indicates that both samples are promising for application in Mn-batteries.
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