Theoretical Investigation of H₂ Oxidation on the Sr2Fe1.5Mo0.5O6 (001) Perovskite Surface Under Anodic Solid Oxide Fuel Cell Conditions

Suthirakun, Suwit; Ammal, Salai Cheettu; Munoz-Garcia, Ana B.; Xiao, Guoliang; Chen, Fanglin; zur Loye, Hans-Conrad; Carter, Emily A.; Heyden, Andreas

doi:10.1021/ja502629j

Title: Theoretical Investigation of H₂ Oxidation on the Sr₂Fe_1.5Mo_0.5O₆ (001) Perovskite Surface Under Anodic Solid Oxide Fuel Cell Conditions

Journal Article · Wed Jun 11 00:00:00 EDT 2014 · Journal of the American Chemical Society, 136(23):8374–8386

DOI:https://doi.org/10.1021/ja502629j· OSTI ID:1222135

Suthirakun, Suwit; Ammal, Salai Cheettu; Munoz-Garcia, Ana B.; Xiao, Guoliang; Chen, Fanglin; zur Loye, Hans-Conrad; Carter, Emily A.; Heyden, Andreas

Periodic density functional theory (DFT) calculations and microkinetic modeling are used to investigate the electrochemical oxidation of H₂ fuel on the (001) surface of Sr₂Fe_1.5Mo_0.5O₆ (SFMO) perovskite under anodic solid oxide fuel cell conditions. Three surface models with different Fe/Mo ratios in the topmost layer-identified by ab initio thermodynamic analysis-are used to investigate the H₂ oxidation mechanism. A microkinetic analysis that considers the effects of anode bias potential suggests that a higher Mo concentration in the surface increases the activity of the surface toward H₂ oxidation. At operating voltage and anodic SOFC conditions, the model predicts that water desorption is rate-controlling and that stabilizing the oxygen vacancy structure increases the overall rate for H₂ oxidation. Although we find that Mo plays a crucial role in improving catalytic activity of SFMO, under fuel cell operating conditions, the Mo content in the surface layer tends to be very low. On the basis of these results and in agreement with previous experimental observations, a strategy for improving the overall electrochemical performance of SFMO is increasing the Mo content or adding small amounts of an active transition metal, such as Ni, to the surface to lower the oxygen vacancy formation energy of the SFMO surface.

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Research Organization:: Pacific Northwest National Laboratory (PNNL), Richland, WA (United States). Environmental Molecular Sciences Laboratory (EMSL)

Sponsoring Organization:: USDOE

DOE Contract Number:: AC05-76RL01830

OSTI ID:: 1222135

Journal Information:: Journal of the American Chemical Society, 136(23):8374–8386, Journal Name: Journal of the American Chemical Society, 136(23):8374–8386

Country of Publication:: United States

Language:: English

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Title: Theoretical Investigation of H₂ Oxidation on the Sr₂Fe_1.5Mo_0.5O₆ (001) Perovskite Surface Under Anodic Solid Oxide Fuel Cell Conditions