Oxygen reduction reaction of PrBaCo2−xFexO5+δ compounds as H+-SOFC cathodes: correlation with physical properties | Zendy

Alexis Grimaud | Zendy; JeanMarc Bassat | Zendy; Fabrice Mauvy | Zendy; M. Pollet | Zendy; Alain Wattiaux | Zendy; Mathieu Marrony | Zendy; JeanClaude Grenier | Zendy

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Oxygen reduction reaction of PrBaCo2−xFexO5+δ compounds as H+-SOFC cathodes: correlation with physical properties

Author(s) -

Alexis Grimaud,

JeanMarc Bassat,

Fabrice Mauvy,

M. Pollet,

Alain Wattiaux,

Mathieu Marrony,

JeanClaude Grenier

Publication year - 2013

Publication title -

journal of materials chemistry a

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 3.637

H-Index - 212

eISSN - 2050-7488

pISSN - 2050-7496

DOI - 10.1039/c3ta13956e

Subject(s) - oxygen , seebeck coefficient , cathode , analytical chemistry (journal) , chemistry , thermogravimetry , electrochemistry , oxide , ionic bonding , diffusion , electrical resistivity and conductivity , ionic conductivity , solid oxide fuel cell , conductivity , materials science , inorganic chemistry , ion , electrode , thermodynamics , anode , thermal conductivity , physics , organic chemistry , chromatography , electrical engineering , electrolyte , composite material , engineering

International audiencePrBaCo2−xFexO5+δ solid solution is investigated in order to understand the Oxygen Reduction Reaction (ORR) and water formation occurring at the H+-SOFC cathode. Careful attention is paid to the study of the physical properties as a function of composition by Thermogravimetry Analysis (TGA), Mössbauer spectroscopy, electrical conductivity and Seebeck coefficient measurements, with the aim to establish the correlation existing with the ORR activity for these Mixed Ionic Electronic Conductors (MIEC). The oxygen diffusion coefficients are determined by Electrical Conductivity Relaxation (ECR) and Isotopic Exchange Depth Profile (IEDP) coupled with Secondary Ion Mass Spectroscopy (SIMS) methods. An electrochemical study is then carried out and shows that the amount of oxygen vacancies is the most influential parameter. Indeed, it allows some hydration of PrBaCo2O5+δ oxide and the formation of protonic defects that can induce protonic diffusivity in these MIEC oxides

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