Oxygen isotope exchange in praseodymium nickelate

Поротникова, Н. М.; Khodimchuk, Anna V.; Ananyev, M.V.; Еремин, В. А.; Tropin, E. S.; Фарленков, А. С.; Pikalova, E. Yu.; Фетисов, А. В.

doi:10.1007/s10008-018-3919-x

Cited by 21 publications

(11 citation statements)

References 32 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Along with materials with the perovskite‐related structures, the complex oxides belonging to the Ruddlesden‐Popper phases are also considered as attractive electrodes for protonic‐conducting SOCs. For example, the Ln 2 NiO 4+δ ‐based materials (Ln = La, Pr, Nd) exhibit hydration capability, high chemical stability against the hydroxide and carbonate formation due to the absence (or reduced amount) of alkaline‐earth elements, quite low TEC values close to those of electrolytes, no meaningful pO 2 ‐induced chemical expansion, high electrical conductivity, and excellent electrochemical activity as a result of both high oxygen diffusion coefficients and surface exchange constants …”

Section: Functional Materials Of Proton‐conducting Socsmentioning

confidence: 99%

Gas Humidification Impact on the Properties and Performance of Perovskite‐Type Functional Materials in Proton‐Conducting Solid Oxide Cells

Wang

Medvedev

Shao

2018

Adv Funct Materials

103

View full text Add to dashboard Cite

Fuel cells and electrolysis cells as important types of energy conversiondevices can be divided into groups based on the electrolyte material. However, solid oxide cells (SOCs) based on conventional oxygen-ion conductors are limited by several issues, such as high operating temperature, the difficulty of hydrogen purification from water, and inferior stability. To avoid these problems, proton-conducting oxides are proposed as electrolytes for SOCs in electrolysis and fuel cell modes. Since water vapor partial pressure (pH 2 O) is one of the main parameters determining the proton concentration in proton-conducting oxides (characteristics of which can be either improved or deteriorated), the pH 2 O control is extremely important for the optimization of the devices' performance and stability. This review provides an overview of the research progresses made for proton-conducting SOCs, especially for the impact of gas humidification on the operability and performance. Fundamental understanding of the main processes in proton-conducting SOCs and design principles for the key components are summarized and discussed. The trends, challenges, and future directions that exist in this dynamic field are also pointed out. This review will inspire interest from various disciplines and provide some useful guidelines for future development of proton-conductor-based energy storage and conversion systems.

show abstract

Section: Functional Materials Of Proton‐conducting Socsmentioning

confidence: 99%

Gas Humidification Impact on the Properties and Performance of Perovskite‐Type Functional Materials in Proton‐Conducting Solid Oxide Cells

Wang

Medvedev

Shao

2018

Adv Funct Materials

103

View full text Add to dashboard Cite

show abstract

“…oxygen diffusion coefficients for Sr2Fe1.5Mo0.5O6−δ oxide were obtained; these values were comparable to the values for praseodymium-barium double cobaltite and exceeded the lanthanum-strontium manganite by more than an order of magnitude. [37,[42][43][44][45][46].…”

Section: Resultsmentioning

confidence: 99%

“…To reduce the contribution of this process to the polarization resistance of the oxygen electrode, it is necessary to impregnate the Sr2Fe1.5Mo0.5O6−δ electrode with active oxides, for example, praseodymium oxide [19], or add mixed conductors to SFM, for example, based on cerium oxide [9,20], or increase the concentration of electronic charge carriers in Sr2Fe1.5Mo0.5O6−δ, for example, doping with heterovalent cations. for some oxides [37,42,[44][45][46][47].…”

Section: Figurementioning

confidence: 99%

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

et al. 2020

View full text Add to dashboard Cite

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.

show abstract

“…Figs. 9, 10 illustrate the temperature dependencies of oxygen exchange coefficient and oxygen diffusion coefficient, respectively, in comparison with literary data for different oxides [22,[26][27][28][29]. The values of activation energy for the exchange and diffusion processes are listed in Table 1.…”

Section: Resultsmentioning

confidence: 99%

Oxygen diffusion and surface exchange kinetics for the mixed-conducting oxide La_0.6Sr_0.4Co_0.8Fe_0.2O_3-δ

et al. 2018

Self Cite

View full text Add to dashboard Cite

Studies of oxygen surface exchange kinetics for La 0.6 Sr 0.4 Co 0.8 Fe 0.2 O 3-δ oxide were performed using the technique of isotopic exchange of molecular oxygen with analysis of gas phase isotopic composition in a static circulation system at the temperatures of 600-800 °С in the oxygen pressure range of 0.27-2.13 kPa. The values of interphase exchange rate and oxygen diffusion coefficient were determined. The effective activation energies for oxygen exchange and diffusion processes as well as the exponents in the dependence of these values versus oxygen pressure in the double logarithmic coordinates were calculated. The process of oxygen dissociative adsorption at the surface of La 0.6 Sr 0.4 Co 0.8 Fe 0.2 O 3-δ oxide was found to be the rate-determining stage.

show abstract

Oxygen isotope exchange in praseodymium nickelate

Cited by 21 publications

References 32 publications

Gas Humidification Impact on the Properties and Performance of Perovskite‐Type Functional Materials in Proton‐Conducting Solid Oxide Cells

Gas Humidification Impact on the Properties and Performance of Perovskite‐Type Functional Materials in Proton‐Conducting Solid Oxide Cells

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

Oxygen diffusion and surface exchange kinetics for the mixed-conducting oxide La_0.6Sr_0.4Co_0.8Fe_0.2O_3-δ

Contact Info

Product

Resources

About

Oxygen isotope exchange in praseodymium nickelate

Cited by 21 publications

References 32 publications

Gas Humidification Impact on the Properties and Performance of Perovskite‐Type Functional Materials in Proton‐Conducting Solid Oxide Cells

Gas Humidification Impact on the Properties and Performance of Perovskite‐Type Functional Materials in Proton‐Conducting Solid Oxide Cells

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

Oxygen diffusion and surface exchange kinetics for the mixed-conducting oxide La0.6Sr0.4Co0.8Fe0.2O3-δ

Contact Info

Product

Resources

About

Oxygen diffusion and surface exchange kinetics for the mixed-conducting oxide La_0.6Sr_0.4Co_0.8Fe_0.2O_3-δ