Influence of Pr6O11 on oxygen electroreduction kinetics and electrochemical performance of Sr2Fe1.5Mo0.5O6-δ based cathode

Осинкин, Д.А.; Береснев, С. М.; Богданович, Н. М.

doi:10.1016/j.jpowsour.2018.04.076

Cited by 48 publications

(14 citation statements)

References 41 publications

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“…The change of R P at low frequency (peak 1) is possibly caused by the deceased porosity and pore size associated with GDC nanoparticles . The impedance should be fitted with the R S -(RCPE) 1 -(RCPE) 2 -(RCPE) 3 equivalent circuit shown in Figure i, and R S , the serial resistance, represents the sum of electrolyte resistance, interface resistance, Pt wires resistance, and other relevant resistances. − …”

Section: Resultsmentioning

confidence: 99%

Electrospun Core–Shell Fibers for High-Efficient Composite Cathode-Based Solid Oxide Fuel Cells

Yang

Wang

et al. 2021

Energy Fuels

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Fibrous perovskite oxide has been the most promising cathode for intermediate-temperature solid oxide fuel cells (IT-SOFCs) due to its efficient mass and charge transfer. Herein, a core−shell fiber-structured YCo 0.5 Fe 0.5 O 3 (YCF)− Gd 0.1 Ce 0.9 O 1.95 (GDC) cathode is synthesized via the modified electrospinning technique. These unique YCF−GDC fibers exhibit a uniform diameter of 300 nm, and the GDC particles are attached to the YCF fiber cores. The electrochemical performance demonstrates a relatively low area-specific resistance of 0.66 Ω•cm 2 at 550 °C in air, which is much lower than 1.56 Ω•cm 2 of pure YCF fiber cathode. Moreover, the distribution of relaxation times (DRT) analysis results indicate that the introduction of GDC nanoparticles and the core−shell structure greatly facilitate oxygen-ion conduction and charge transfer processes, and the oxygen incorporation process plays a major role in the total polarization resistance. The NiO−GDC|GDC|fibrous YCF−GDC fuel cell shows a maximum power density of 426.5 mW•cm −2 at 550 °C. These results display that the core−shell fiber-structured YCF− GDC composite oxide is a promising candidate of highly active cathode for IT-SOFCs.

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Section: Resultsmentioning

confidence: 99%

Electrospun Core–Shell Fibers for High-Efficient Composite Cathode-Based Solid Oxide Fuel Cells

Yang

Wang

et al. 2021

Energy Fuels

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“…He and Y. Wang [17,29] suggested that oxygen ion transfer processes, in particular surface exchange and oxygen diffusion, were limited to the kinetics of oxygen reduction. In our work [24], we concluded that the low electrochemical activity of SFM in air was associated with a low rate of oxygen exchange on the surface, based on a comparison of the DRT function of the SFM electrode in the air atmosphere before and after the introduction of praseodymium oxide into the SFM electrode.…”

Section: Introductionmentioning

confidence: 85%

“…The rates of hydrogen oxidation and oxygen reduction reactions are also quite high for these electrodes. The polarization resistance can be significantly reduced, by an order of magnitude, by doping crystal lattice, impregnating electrodes, or modifying the microstructure of electrodes [17][18][19][20][21][22][23][24][25][26].…”

Section: Introductionmentioning

confidence: 99%

Rate-Determining Steps of Oxygen Surface Exchange Kinetics on Sr2Fe1.5Mo0.5O6−δ

et al. 2020

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The oxygen surface kinetics of Sr2Fe1.5Mo0.5O6−δ was determined using the 16O2/18O2 isotope exchange method with gas phase analysis at 600–800 °C. The heterogeneous exchange rates (rH) and the oxygen diffusion coefficients (D) were calculated by processing the concentration dependences of the 18O fraction using Ezin’s model. The rates of oxygen dissociative adsorption (ra) and incorporation (ri) were calculated based on a model using the three exchange type rates. It has been established that the rates ra and ri were comparable in this temperature range. Assumptions were made about the effect of the chemical composition of the surface on the rate of oxygen adsorption. It was found that the oxygen exchange coefficient (k) of Sr2Fe1.5Mo0.5O6−δ is comparable to that of La0.6Sr0.4MnO3±δ oxide. High values of the oxygen diffusion coefficient were found for Sr2Fe1.5Mo0.5O6−δ. The values were comparable to those of the double cobaltite praseodymium-barium and exceed by more than an order those of lanthanum-strontium manganite.

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“…20−22 Among the ceramic perovskite oxides, the strontium iron molybdenum (SFM) family exhibits particularly interesting features, such as tolerance to reducing atmosphere, 23 high conductivity, 24 and decent catalytic activity. 25 However, to the best of our knowledge, the origins of the enhancement effect of H 2 O on ceramic anodes have still remained unclear. For an all-ceramic anode, the aforementioned mechanisms accounting for the enhanced HOR on Ni/ YSZ anodes cannot be applied to the pure Ni-free ceramic anodes because of the different reaction sites on Ni/YSZ (e.g., three-phase boundaries) and mixed ionic and electronic conducting (MIEC) perovskites (e.g., the broad solid−gas two-phase boundaries), such as Sr 2 Fe 1.5 Mo 0.5 O 6−δ (SF1.5M).…”

Section: Introductionmentioning

confidence: 99%

“…Humidified H 2 is also employed in the emerging ceramic anodes. − Among the ceramic perovskite oxides, the strontium iron molybdenum (SFM) family exhibits particularly interesting features, such as tolerance to reducing atmosphere, high conductivity, and decent catalytic activity . However, to the best of our knowledge, the origins of the enhancement effect of H 2 O on ceramic anodes have still remained unclear.…”

Section: Introductionmentioning

confidence: 99%

Positive Effects of H₂O on the Hydrogen Oxidation Reaction on Sr₂Fe_1.5Mo_0.5O_6−δ-Based Perovskite Anodes for Solid Oxide Fuel Cells

Lee

Yang

et al. 2020

ACS Catal.

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The steam is commonly supplied with H2 to the anodes of Ni-based solid oxide fuel cells (SOFCs). Humidified H2 is also widely used for emerging perovskite anodes of SOFCs, although the influences of H2O on the hydrogen oxidation reaction (HOR) on their surfaces have not been well understood yet. In this work, the effects of H2O on the HOR on Sr2Fe1.5Mo0.5O6−δ (SF1.5M), La0.5Sr1.5Fe1.5Mo0.5O6−δ (LSFM), and Pr0.5Sr1.5Fe1.5Mo0.5O6−δ (PSFM) were systematically investigated using the electrochemical impedance spectroscopy (EIS) and electrical conductivity relaxation (ECR) methods. The EIS spectra suggested the possible promotional effect of H2O on decreasing the polarization resistance of SF1.5M. The ECR results confirmed that the presence of H2O in H2 can significantly increase the oxygen exchange coefficients of SF1.5M, LSFM, and PSFM. To gain a mechanistic understanding of the role of H2O, the density functional theory-based calculations and thermodynamic modeling were performed to unravel the effect of H2O on the HOR on the SF1.5M (001) surfaces. Benefiting from the increment of the oxygen chemical potential and decrement of the free electron concentration upon increasing humidity, the plateau intermediate state in the HOR energy landscape, the step of H2O plus surface oxygen vacancy formation, is reduced on the SF1.5M (001) BO2 (B = Fe and Mo)-terminated surfaces, when decreasing the slab oxygen nonstoichiometry. Furthermore, by comparing the scenarios of the HOR on the dry and hydrated surfaces, the H2O plus surface oxygen vacancy formation energies are lower in the latter case. These two proposed factors, i.e., (i) change of electron chemical potential upon the change of near-surface δ and (ii) enhanced interaction of surface H species with the hydrated perovskite surfaces, contribute to the promoted HOR in the presence of H2O. This work provides important insights into the effects of H2O on the HOR for SOFCs.

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Influence of Pr6O11 on oxygen electroreduction kinetics and electrochemical performance of Sr2Fe1.5Mo0.5O6-δ based cathode

Cited by 48 publications

References 41 publications

Electrospun Core–Shell Fibers for High-Efficient Composite Cathode-Based Solid Oxide Fuel Cells

Electrospun Core–Shell Fibers for High-Efficient Composite Cathode-Based Solid Oxide Fuel Cells

Rate-Determining Steps of Oxygen Surface Exchange Kinetics on Sr2Fe1.5Mo0.5O6−δ

Positive Effects of H₂O on the Hydrogen Oxidation Reaction on Sr₂Fe_1.5Mo_0.5O_6−δ-Based Perovskite Anodes for Solid Oxide Fuel Cells

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Influence of Pr6O11 on oxygen electroreduction kinetics and electrochemical performance of Sr2Fe1.5Mo0.5O6-δ based cathode

Cited by 48 publications

References 41 publications

Electrospun Core–Shell Fibers for High-Efficient Composite Cathode-Based Solid Oxide Fuel Cells

Electrospun Core–Shell Fibers for High-Efficient Composite Cathode-Based Solid Oxide Fuel Cells

Rate-Determining Steps of Oxygen Surface Exchange Kinetics on Sr2Fe1.5Mo0.5O6−δ

Positive Effects of H2O on the Hydrogen Oxidation Reaction on Sr2Fe1.5Mo0.5O6−δ-Based Perovskite Anodes for Solid Oxide Fuel Cells

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Product

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Positive Effects of H₂O on the Hydrogen Oxidation Reaction on Sr₂Fe_1.5Mo_0.5O_6−δ-Based Perovskite Anodes for Solid Oxide Fuel Cells