Proton uptake in the H+-SOFC cathode material Ba0.5Sr0.5Fe0.8Zn0.2O3-δ: 
transition from hydration to hydrogenation with increasing oxygen partial 
pressure

Poetzsch, D.; Merkle, R.; Maier, J.

Item

ITEM ACTIONSEXPORT

Add to Basket

Local TagsRelease HistoryDetailsSummary

Released

Journal Article

Proton uptake in the H⁺-SOFC cathode material Ba_0.5Sr_0.5Fe_0.8Zn_0.2O_3-δ: transition from hydration to hydrogenation with increasing oxygen partial pressure

MPS-Authors

/persons/resource/persons280302

Merkle, R.
Department Physical Chemistry of Solids (Joachim Maier), Max Planck Institute for Solid State Research, Max Planck Society;

/persons/resource/persons217129

Maier, J.
Department Physical Chemistry of Solids (Joachim Maier), Max Planck Institute for Solid State Research, Max Planck Society;

External Resource

No external resources are shared

Fulltext (restricted access)

There are currently no full texts shared for your IP range.

Fulltext (public)

There are no public fulltexts stored in PuRe

Supplementary Material (public)

There is no public supplementary material available

Citation

Poetzsch, D., Merkle, R., & Maier, J. (2015). Proton uptake in the H⁺-SOFC cathode material Ba_0.5Sr_0.5Fe_0.8Zn_0.2O_3-δ: transition from hydration to hydrogenation with increasing oxygen partial pressure. Faraday Discussions, 182, 129-143.

Cite as: https://hdl.handle.net/21.11116/0000-000E-CA9A-1

Abstract

Thermogravimetric investigations on the perovskite Ba0.5Sr0.5Fe0.8Zn0.2O3-delta (BSFZ, with mixed hole, oxygen vacancy and proton conductivity) from water vapor can occur by acid-base reaction (hydration) or redox reaction (hydrogen uptake), depending on the oxygen partial pressure, i.e. on the material's defect concentrations. In parallel, the effective diffusion coefficient of the stoichiometry relaxation kinetics also changes. These striking observations can be rationalized in terms of a defect chemical model and transport equations for materials with three mobile carriers. Implications for the search of cathode materials with mixed electronic and protonic conductivity for application on proton conducting oxide electrolytes are discussed.