Electronic Behavior of Ba0.5Sr0.5Co0.8Fe0.2O3-d and SrCo0.9Nb0.1O3-d

2011 ◽  
Vol 1331 ◽  
Author(s):  
Robert E. Usiskin ◽  
Richard Y. Wang ◽  
Sossina M. Haile
Keyword(s):  
Solid Oxide Fuel Cells ◽  
Electronic Conductivity ◽  
Defect Chemistry ◽  
Solid Oxide ◽  
High Catalytic Activity ◽  
Membrane Material ◽  
Comparable Performance ◽  
Oxygen Reduction Catalyst ◽  
Hole Migration ◽  
Electronic Behavior

ABSTRACTThe perovskite Ba0.5Sr0.5Co0.8Fe0.2O3-d (BSCF 5582) has attracted great interest as an oxygen reduction catalyst for solid oxide fuel cells and as an oxygen permeation membrane material. Mixed ionic and electronic conductivity is essential to the high catalytic activity it exhibits, however its electronic behavior and overall defect chemistry are not well understood. The related material SrCo0.9Nb0.1O3-d (SCN 091) is another promising composition that may have comparable performance, but with defect chemistry that is simpler to study. From a combination of thermogravimetric, impedance, and diffraction measurements we find SCN 091 to exhibit somewhat smaller oxygen nonstoichiometry, five times higher electronic conductivity, lower enthalpy of hole migration, and greater structural stability than BSCF 5582. We also observe that the enthalpy of hole migration in such materials tends to increase as oxygen content decreases; the origins of this behavior are unclear.

Tailoring defect chemistry at interfaces for promoted oxygen reduction reaction kinetics

2020 ◽  
Vol 8 (44) ◽  
pp. 23313-23322
Author(s):  
Seo Ju Kim ◽  
Ja Yang Koo ◽  
Taeeun Mun ◽  
Mingi Choi ◽  
Wonyoung Lee
Keyword(s):  
Fuel Cells ◽  
Electrochemical Performance ◽  
Solid Oxide Fuel Cells ◽  
Oxygen Reduction Reaction ◽  
Reaction Kinetics ◽  
Oxygen Reduction ◽  
Defect Chemistry ◽  
Reduction Reaction ◽  
Solid Oxide ◽  
Oxide Fuel

Engineering the defect chemistry at the interface between the electrolyte and the electrode is crucial to facilitate oxygen reduction reaction, thereby improve the electrochemical performance of intermediate temperature solid oxide fuel cells.

scholarly journals Development of novel air electrode materials for the SOFC and SOEC technologies

2019 ◽  
Vol 108 ◽  
pp. 01019 ◽  
Author(s):  
Anna Niemczyk ◽  
Konrad Świerczek
Keyword(s):  
Solid Oxide Fuel Cells ◽  
Electrode Materials ◽  
Operating Temperature ◽  
Electronic Conductivity ◽  
Reduction Reaction ◽  
Significant Decline ◽  
Solid Oxide ◽  
Air Electrode ◽  
Good Catalytic Activity ◽  
New Compounds

One of major goals in the development of solid oxide fuel cells and its reversible mode, solid oxide electrolyzer cells, is related to a decrease of the operating temperature, down to the intermediate range (600-800 °C) or even lower temperatures. However, this reduction causes an increase of the polarization resistance, especially for the air electrode, which results in a significant decline of the efficiency of the device. Therefore, it is essential to obtain new, thermally and chemically stable materials with the high ionic-electronic conductivity and good catalytic activity for the oxygen reduction reaction working in the decreased temperature range. At the same time, environmental and economic aspects have to be considered in the development of the new compounds. Promising cobalt-free electrode materials can be Cu-based oxides with the perovskite and perovskite-related structures.

Defect Chemistry and Electrical Conductivity of Sm-Doped La1–xSrxCoO3−δfor Solid Oxide Fuel Cells

2017 ◽  
Vol 121 (28) ◽  
pp. 15017-15027 ◽  
Author(s):  
Mårten E. Björketun ◽  
Ivano E. Castelli ◽  
Jan Rossmeisl ◽  
Thomas Olsen ◽  
Kenji Ukai ◽  
...  
Keyword(s):  
Electrical Conductivity ◽  
Fuel Cells ◽  
Solid Oxide Fuel Cells ◽  
Defect Chemistry ◽  
Solid Oxide ◽  
Oxide Fuel

Defect chemistry and oxygen non-stoichiometry in SrFe0.2Co0.4Mo0.4O3-δ ceramic oxide for solid oxide fuel cells

Ionics ◽  
2020 ◽  
Vol 26 (11) ◽  
pp. 5641-5649
Author(s):  
Patrick Stanley ◽  
A. Mohammed Hussain ◽  
Yi-Lin Huang ◽  
J. Evans Gritton ◽  
Eric D. Wachsman
Keyword(s):  
Fuel Cells ◽  
Solid Oxide Fuel Cells ◽  
Defect Chemistry ◽  
Solid Oxide ◽  
Oxide Fuel ◽  
Ceramic Oxide

scholarly journals A highly active Ni/Ce0.8Sm0.2O1.9 anode catalyst with a three-dimensionally ordered macroporous structure for solid oxide fuel cells

2020 ◽  
Vol 8 (16) ◽  
pp. 7792-7800 ◽  
Author(s):  
Tian Gan ◽  
Xinqiang Fan ◽  
Ye Liu ◽  
Chengyu Wang ◽  
Haoran Mei ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Solid Oxide Fuel Cells ◽  
Anode Material ◽  
Solid Oxide ◽  
High Catalytic Activity ◽  
Oxide Fuel ◽  
Macroporous Structure ◽  
Anode Catalyst ◽  
Highly Active ◽  
Ordered Macroporous

Ni/3DOM Ce0.8Sm0.2O1.9 shows a high catalytic activity as the anode material of CH3OH fueled SOFCs.

A Comparison of Electrochemical Performance of Double Perovskite REBaCo2O5+x Cathodes in Symmetrical Solid Oxide Fuel Cells

2008 ◽  
Vol 1126 ◽  
Author(s):  
Wenquan Gong ◽  
Manoj Yadav ◽  
Allan J. Jacobson
Keyword(s):  
Fuel Cells ◽  
Electrochemical Performance ◽  
Solid Oxide Fuel Cells ◽  
Electronic Conductivity ◽  
Solid Oxide ◽  
Oxide Fuel ◽  
Surface Exchange ◽  
Defect Sites ◽  
Composite Cathodes ◽  
High Electronic Conductivity

AbstractThe segregated vacancies in the A site-ordered oxygen-deficient double perovskites REBaCo2O5+x (RE = La, Pr, Nd, Sm, Eu) (RBCO) are thought to greatly enhance the diffusivity of oxide ions in the bulk of these materials and possibly supply surface defect sites with enhanced reactivity towards molecular oxygen. Some materials in this family of REBaCo2O5+x compounds, such as PrBaCo2O5+x, (PBCO), have already demonstrated high electronic conductivity, rapid oxygen ion diffusion and surface exchange kinetics. Therefore, the family of REBaCo2O5+x compounds were synthesized and evaluated as cathode materials for intermediate temperature solid oxide fuel cells (SOFCs) based on gadolinium doped ceria (CGO) electrolytes. The electrochemical performance of symmetrical cells (REBaCo2O5+x + CGO composite cathodes on the CGO electrolytes) was evaluated by using AC impedance spectroscopy. The area specific resistance (ASR) performance was measured as a function of temperature as well as oxygen partial pressure.

Catalytic Activity of Ceria-Based Complex Metal Oxides in Alkaline and Acidic Environments

2013 ◽  
Vol 1542 ◽  
Author(s):  
Matthew C Schrandt ◽  
Praveen Kolla ◽  
A. Smirnova
Keyword(s):  
Catalytic Activity ◽  
Solid Oxide Fuel Cells ◽  
Low Temperatures ◽  
Catalytic Reduction ◽  
Electronic Conductivity ◽  
Solid Oxide ◽  
Pt Catalysts ◽  
Complex Metal Oxides ◽  
Acidic Environments ◽  
Limited Supply

ABSTRACTPt catalysts are the leading catalysts for use in ORR. However, Pt is an expensive catalyst and with limited supply can not be considered a sustainable material for feasible application that is scalable in the economy. This calls for new solutions for catalyst materials that either mitigate the amount of Pt used in catalysts by developing hybrid catalysts, or to replace Pt altogether with a material with similar or better catalytic activity. Perovskite LSCF and Fluorite GDC materials with proven catalytic activity in solid oxide fuel cells are herein explored for their catalytic reduction of oxygen for use at low temperatures. Since the materials lack electronic conductivity at low temperatures, we have improved their conductivity with graphene. The resulting materials are compared to Pt in their ORR catalytic capabilities and electronic conductivity.

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