Improving oxygen incorporation rate on (La0.6Sr0.4)0.98FeO3-δ via Pr2Ni1-xCuxO4+δ surface decoration

Mohamad Khoshkalam; Ðorđije Tripković; Xiaofeng Tong; Mohammad Ali Faghihi-Sani; Ming Chen; Peter Vang Hendriksen

doi:10.1016/j.jpowsour.2020.228035

Improving oxygen incorporation rate on (La_0.6Sr_0.4)_0.98FeO_3-δ via Pr₂Ni_1-xCuxO_4+δ surface decoration

Mohamad Khoshkalam^*, Ðorđije Tripković, Xiaofeng Tong, Mohammad Ali Faghihi-Sani, Ming Chen, Peter Vang Hendriksen

^*Corresponding author for this work

Department of Energy Conversion and Storage

Research output: Contribution to journal › Journal article › Research › peer-review

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Abstract

Insufficient electrocatalytic activity for oxygen reduction/evolution in lanthanum strontium ferrite (LSF) perovskites at temperatures below 700 °C, limits the utilization of these Co-free oxides as oxygen electrodes for intermediate-temperature solid oxide fuel/electrolysis cells (SOFC/SOEC). Marked performance improvement is here reported by decorating the surface with Pr₂Ni_1-xCu_xO₄ catalyst particles. Infiltrating porous LSF electrodes with aqueous nitrates solutions containing Pr, Ni and Cu, targeting the compositions Pr₂Ni_0.7Cu_0.3O₄ and Pr₂Ni_0.6Cu_0.4O₄, significantly reduces the polarization resistance at 650 °C from 0.98 Ω cm² to 0.16 Ω cm2 and 0.13 Ω cm² respectively. Electrical Conductivity Relaxation (ECR) measurements reveal that surface exchange rates, expressed by (kchem), are much more stable in week long aging experiments for Pr₂Ni_0.7Cu_0.3O₄surface decorated LSF bars compared to the bare LSF. This shows that a Pr₂Ni_1-xCu_xO₄ infiltrated porous LSF backbone can be an efficient Co-free oxygen electrode for intermediate-temperature SOFC/SOEC.

Original language	English
Article number	228035
Journal	Journal of Power Sources
Volume	457
Number of pages	12
ISSN	0378-7753
DOIs	https://doi.org/10.1016/j.jpowsour.2020.228035
Publication status	Published - 2020

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@article{c55c576f5c574fff835c5ed33cb23fdc,

title = "Improving oxygen incorporation rate on (La0.6Sr0.4)0.98FeO3-δ via Pr2Ni1-xCuxO4+δ surface decoration",

abstract = "Insufficient electrocatalytic activity for oxygen reduction/evolution in lanthanum strontium ferrite (LSF) perovskites at temperatures below 700 °C, limits the utilization of these Co-free oxides as oxygen electrodes for intermediate-temperature solid oxide fuel/electrolysis cells (SOFC/SOEC). Marked performance improvement is here reported by decorating the surface with Pr2Ni1-xCuxO4 catalyst particles. Infiltrating porous LSF electrodes with aqueous nitrates solutions containing Pr, Ni and Cu, targeting the compositions Pr2Ni0.7Cu0.3O4 and Pr2Ni0.6Cu0.4O4, significantly reduces the polarization resistance at 650 °C from 0.98 Ω cm2 to 0.16 Ω cm2 and 0.13 Ω cm2 respectively. Electrical Conductivity Relaxation (ECR) measurements reveal that surface exchange rates, expressed by (kchem), are much more stable in week long aging experiments for Pr2Ni0.7Cu0.3O4 surface decorated LSF bars compared to the bare LSF. This shows that a Pr2Ni1-xCuxO4 infiltrated porous LSF backbone can be an efficient Co-free oxygen electrode for intermediate-temperature SOFC/SOEC.",

author = "Mohamad Khoshkalam and {\DH}or{\d}ije Tripkovi{\'c} and Xiaofeng Tong and Faghihi-Sani, {Mohammad Ali} and Ming Chen and Hendriksen, {Peter Vang}",

year = "2020",

doi = "10.1016/j.jpowsour.2020.228035",

language = "English",

volume = "457",

journal = "Journal of Power Sources",

issn = "0378-7753",

publisher = "Elsevier",

}

TY - JOUR

T1 - Improving oxygen incorporation rate on (La0.6Sr0.4)0.98FeO3-δ via Pr2Ni1-xCuxO4+δ surface decoration

AU - Khoshkalam, Mohamad

AU - Tripković, Ðorđije

AU - Tong, Xiaofeng

AU - Faghihi-Sani, Mohammad Ali

AU - Chen, Ming

AU - Hendriksen, Peter Vang

PY - 2020

Y1 - 2020

N2 - Insufficient electrocatalytic activity for oxygen reduction/evolution in lanthanum strontium ferrite (LSF) perovskites at temperatures below 700 °C, limits the utilization of these Co-free oxides as oxygen electrodes for intermediate-temperature solid oxide fuel/electrolysis cells (SOFC/SOEC). Marked performance improvement is here reported by decorating the surface with Pr2Ni1-xCuxO4 catalyst particles. Infiltrating porous LSF electrodes with aqueous nitrates solutions containing Pr, Ni and Cu, targeting the compositions Pr2Ni0.7Cu0.3O4 and Pr2Ni0.6Cu0.4O4, significantly reduces the polarization resistance at 650 °C from 0.98 Ω cm2 to 0.16 Ω cm2 and 0.13 Ω cm2 respectively. Electrical Conductivity Relaxation (ECR) measurements reveal that surface exchange rates, expressed by (kchem), are much more stable in week long aging experiments for Pr2Ni0.7Cu0.3O4 surface decorated LSF bars compared to the bare LSF. This shows that a Pr2Ni1-xCuxO4 infiltrated porous LSF backbone can be an efficient Co-free oxygen electrode for intermediate-temperature SOFC/SOEC.

AB - Insufficient electrocatalytic activity for oxygen reduction/evolution in lanthanum strontium ferrite (LSF) perovskites at temperatures below 700 °C, limits the utilization of these Co-free oxides as oxygen electrodes for intermediate-temperature solid oxide fuel/electrolysis cells (SOFC/SOEC). Marked performance improvement is here reported by decorating the surface with Pr2Ni1-xCuxO4 catalyst particles. Infiltrating porous LSF electrodes with aqueous nitrates solutions containing Pr, Ni and Cu, targeting the compositions Pr2Ni0.7Cu0.3O4 and Pr2Ni0.6Cu0.4O4, significantly reduces the polarization resistance at 650 °C from 0.98 Ω cm2 to 0.16 Ω cm2 and 0.13 Ω cm2 respectively. Electrical Conductivity Relaxation (ECR) measurements reveal that surface exchange rates, expressed by (kchem), are much more stable in week long aging experiments for Pr2Ni0.7Cu0.3O4 surface decorated LSF bars compared to the bare LSF. This shows that a Pr2Ni1-xCuxO4 infiltrated porous LSF backbone can be an efficient Co-free oxygen electrode for intermediate-temperature SOFC/SOEC.

U2 - 10.1016/j.jpowsour.2020.228035

DO - 10.1016/j.jpowsour.2020.228035

M3 - Journal article

SN - 0378-7753

VL - 457

JO - Journal of Power Sources

JF - Journal of Power Sources

M1 - 228035

ER -