Characterisation of La0.6Sr0.4Co0.2Fe0.8O3-δ – Ba0.5Sr0.5Co0.8Fe0.2O3-δ composite as cathode for solid oxide fuel cells

Giuliano, Alice; Carpanese, Maria Paola; Panizza, Marco; Cerisola, G.; Clematis, Davide; Barbucci, Antonio

doi:10.1016/j.electacta.2017.04.079

Cited by 30 publications

(13 citation statements)

References 59 publications

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“…Electrochemical reaction at high frequency is related to a charge transfer reaction; the transport of ionic species across from the electrode to the electrolyte. On the other hand, semicircle at low frequency was related to oxygen dissociation on the electrode surface. − The dispersion or mixture of Au nanoparticles in PNCG resulted in a decrease of the high frequency semicircle, which suggests an increase in the interface contact between the electrode and electrolyte. As with the result in Figure a, reduced ohmic resistance indicates an improvement in the interface and the transport of ionic species.…”

Section: Resultsmentioning

confidence: 99%

Strain Effects on Oxygen Reduction Activity of Pr₂NiO₄ Caused by Gold Bulk Dispersion for Low Temperature Solid Oxide Fuel Cells

Kim

Akbay

Matsuda³

et al. 2019

ACS Appl. Energy Mater.

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Effects of tensile strain induced by the dispersion of Au nanoparticles in Pr 2 NiO 4 -based oxide on the oxygen reduction reaction were investigated. Au-dispersed Pr 1.9 Ni 0.71 Cu 0.41 Ga 0.05 O 4+δ (PNCG) showed a much decreased cathodic overpotential, and a cell using Au-dispersed PNCG showed a significantly higher power density, approximately 2.5 times higher than that of a cell using PNCG without dispersed Au. The smallest overpotential was achieved at 3−5 mol % dispersion of Au nanoparticles, at which the largest tensile strain was observed. Impedance measurements suggested that the impedance arc in the lower frequency range was mainly decreased; therefore, the increased activity to oxygen reduction was attributed to the increased bulk and surface diffusivity of oxide ions. Electron energy loss spectroscopy (EELS) shows that oxygen in the strained region was in a more reduced state and this oxygen could be assigned to interstitial oxygen which is highly mobile. In addition, density functional theory (DFT) analysis suggested that bond destabilization was attributed to the increase in energy of occupied π* orbitals of surface peroxo species on tensile strained surfaces. Therefore, increased cathodic performance of PNCG by Au nanoparticle dispersion could be assigned to the increased diffusivity by tensile strain.

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Section: Resultsmentioning

confidence: 99%

Strain Effects on Oxygen Reduction Activity of Pr₂NiO₄ Caused by Gold Bulk Dispersion for Low Temperature Solid Oxide Fuel Cells

Kim

Akbay

Matsuda³

et al. 2019

ACS Appl. Energy Mater.

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“…110 Giuliano et al combined these materials in a 1:1 volume ratio. 111 The XRD analysis showed that, after sintering the starting perovskites, Co-rich La 0.5 Ba 0.5 CoO 3 and Sr-rich La 0.4 Sr 0.6 FeO 3 phases were formed. This electrode was then tested in the symmetrical Ce 0.8 Sm 0.2 O 2 (SDC) supported cell configuration along with LSCF and BSCF as reference cells.…”

Section: Electrochemical Performance Of Lafeo 3 Perovskitesmentioning

confidence: 98%

“…LSCF has high electrical conductivity but a low oxygen diffusion rate. , In contrast, BSCF has a high oxygen diffusion rate and catalytic activity but low chemical stability . Giuliano et al combined these materials in a 1:1 volume ratio . The XRD analysis showed that, after sintering the starting perovskites, Co-rich La 0.5 Ba 0.5 CoO 3 and Sr-rich La 0.4 Sr 0.6 FeO 3 phases were formed.…”

Section: Electrochemical Performance Of Lafeo3 Perovskitesmentioning

confidence: 99%

A Review on Perovskite-Type LaFeO₃ Based Electrodes for CO₂ Reduction in Solid Oxide Electrolysis Cells: Current Understanding of Structure–Functional Property Relationships

et al. 2021

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Mixed ionic and electronic conductors (MIECs) are being studied extensively as a potential replacement for cermet catalysts in solid oxide cells (SOCs)collectively named for solid oxide fuel cells and solid oxide electrolysis cellsdue to their high activity, great stability, and low cost. Perovskite-type LaFeO3-based catalysts are one of the most promising electrodes for SOCs. This review paper provides an update on the chemical composition–crystal structure–physical property relationships and an understanding of the electrochemical reaction mechanisms in the perovskite-type structure LaFeO3 electrodes. Mechanisms for electrochemical CO2 reduction on the perovskite structure surface and oxygen diffusion are discussed. Furthermore, the electrochemical performance enhancement strategies such as composite electrodes and nanoparticles ex-solution are briefly presented together with industrialization issues, e.g., gas impurities and stability of the interconnecting materials.

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“…Although BSCF possesses high ionic conductivity, its electronic conductivity is relatively low with a value of around 40 S cm –1 at 500–800 °C, which is much smaller than that of La 0.6 Sr 0.4 Co 0.2 Fe 0.8 O 3‑δ (LSCF6428) and LSM. ,− By introduction of a second phase with high electronic conductivity into BSCF, a composite cathode with high electrical conductivity will be formed, and thus BSCF-based cathodes with improved activity can be expected. − For example, Zhou et al added LaCoO 3 with an extremely high electrical conductivity of ∼1000 S cm –1 into BSCF, and the obtained composite showed a much higher electrical conductivity of ∼300 S cm –1 compared to pure BSCF (∼40 S cm –1 ) . A promising electrochemical performance was also demonstrated with an ASR of 0.21 Ω cm 2 at 600 °C for the BSCF-based composite consisting of 30 vol % LaCoO 3 .…”

Section: Energy Storage and Conversion Applicationsmentioning

confidence: 99%

Fundamental Understanding and Application of Ba_0.5Sr_0.5Co_0.8Fe_0.2O_3−δPerovskite in Energy Storage and Conversion: Past, Present, and Future

Shao

2021

Energy Fuels

143

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In the societal pursuit of a carbon-neutral energy future, energy storage and conversion technologies can play a decisive role in better utilizing sustainable energy sources such as wind and solar, in which functional materials that can promote overall energy efficiency hold the key. Perovskite oxides have attracted considerable attention as cost-effective, nonprecious metal-based candidates for this purpose due to their flexible chemistries and tunable physicochemical properties. Of all the perovskite compositions, the barium strontium cobalt iron oxide with a specific chemical formula of Ba0.5Sr0.5Co0.8Fe0.2O3−δ (BSCF) has received considerable and growing interest over the last two decades in a variety of energy applications. In this review, we provide a comprehensive overview of the achievements made on BSCF for various energy storage and conversion applications. Importantly, we offer a fundamental understanding of the roles of BSCF in these applications and of the optimization approaches available to obtain improved functionalities, which can have an enormous impact on the search and development of materials based on BSCF and new materials beyond.

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Characterisation of La0.6Sr0.4Co0.2Fe0.8O3-δ – Ba0.5Sr0.5Co0.8Fe0.2O3-δ composite as cathode for solid oxide fuel cells

Cited by 30 publications

References 59 publications

Strain Effects on Oxygen Reduction Activity of Pr₂NiO₄ Caused by Gold Bulk Dispersion for Low Temperature Solid Oxide Fuel Cells

Strain Effects on Oxygen Reduction Activity of Pr₂NiO₄ Caused by Gold Bulk Dispersion for Low Temperature Solid Oxide Fuel Cells

A Review on Perovskite-Type LaFeO₃ Based Electrodes for CO₂ Reduction in Solid Oxide Electrolysis Cells: Current Understanding of Structure–Functional Property Relationships

Fundamental Understanding and Application of Ba_0.5Sr_0.5Co_0.8Fe_0.2O_3−δPerovskite in Energy Storage and Conversion: Past, Present, and Future

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Characterisation of La0.6Sr0.4Co0.2Fe0.8O3-δ – Ba0.5Sr0.5Co0.8Fe0.2O3-δ composite as cathode for solid oxide fuel cells

Cited by 30 publications

References 59 publications

Strain Effects on Oxygen Reduction Activity of Pr2NiO4 Caused by Gold Bulk Dispersion for Low Temperature Solid Oxide Fuel Cells

Strain Effects on Oxygen Reduction Activity of Pr2NiO4 Caused by Gold Bulk Dispersion for Low Temperature Solid Oxide Fuel Cells

A Review on Perovskite-Type LaFeO3 Based Electrodes for CO2 Reduction in Solid Oxide Electrolysis Cells: Current Understanding of Structure–Functional Property Relationships

Fundamental Understanding and Application of Ba0.5Sr0.5Co0.8Fe0.2O3−δPerovskite in Energy Storage and Conversion: Past, Present, and Future

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About

Strain Effects on Oxygen Reduction Activity of Pr₂NiO₄ Caused by Gold Bulk Dispersion for Low Temperature Solid Oxide Fuel Cells

Strain Effects on Oxygen Reduction Activity of Pr₂NiO₄ Caused by Gold Bulk Dispersion for Low Temperature Solid Oxide Fuel Cells

A Review on Perovskite-Type LaFeO₃ Based Electrodes for CO₂ Reduction in Solid Oxide Electrolysis Cells: Current Understanding of Structure–Functional Property Relationships

Fundamental Understanding and Application of Ba_0.5Sr_0.5Co_0.8Fe_0.2O_3−δPerovskite in Energy Storage and Conversion: Past, Present, and Future