Oxygen isotope exchange in proton-conducting oxides based on lanthanum scandates

Фарленков, А. С.; Khodimchuk, Anna V.; Shevyrev, Nikita A.; Stroeva, А. Yu.; Фетисов, А. В.; Ananyev, M.V.

doi:10.1016/j.ijhydene.2019.08.088

Cited by 12 publications

(10 citation statements)

References 32 publications

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“…where Ba / are Ba dopant atoms in La regular lattice positions, O are oxygen atoms in regular lattice positions, V •• are oxygen vacancies, and OH • are proton defects. The perovskite group of the A 3+ B 3+ O3 type, such as La1-xMxBO3-δ (where M = Ca, Sr, Ba; B = Y, Yb, Sc, In) [8][9][10][11][12][13][14][15][16][17][18][19][20][21][22][23][24][25][26][27], are promising ceramic proton conductors because they have…”

Section: Introductionmentioning

confidence: 99%

“…a significant advantage over the widely studied materials based on Ba(Zr,Ce)O3 due to the tendency of Ba to carbonize [28][29][30]. Systematic studies of the transport properties of La1-xMxBO3-δ demonstrate a tendency for an increase in proton conductivity with an increase in the ionic radius of the dopant and a decrease in the ionic radius of the B-cation [8][9][10][11][12][13][14][15][16][17][18][19][20][21][22][23][24][25][26][27]; thus, the highest proton conductivity should be realized in La1-xBaxScO3-δ.…”

Section: Introductionmentioning

confidence: 99%

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Densification and Proton Conductivity of La1-xBaxScO3-δ Electrolyte Membranes

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Bain La1-xBaxScO3-δ impairs sintering and leads to a decrease in its ceramic density. Two approaches have been studied for obtaining dense ceramics: using a high processing temperature and the introduction of a Co3O4 sintering additive. An addition of only 0.5 wt% of Co3O4 sintering additive, despite the positive sintering effect, causes a noticeable violation of stoichiometry, with partial decomposition of the material. This can lead to the formation of cationic vacancies, which form associates with oxygen vacancies and significantly reduce the oxygen ion and proton conductivity of the materials. There is also a partial substitution of Co for Sc in La1-xBaxScO3-δ, which reduces the stability of protons: it reduces the enthalpy of the hydration reaction, but increases the mobility of protons. Thus, the Co3O4 sintering additive causes a complex of negative effects on the conductivity of La1-xBaxScO3-δ materials. Only high-temperature (1800 °C) processing with protection against Ba loss contributes to the production of dense La1-xBaxScO3-δ ceramics. The chemical composition of such ceramics corresponds well to the specified one, which ensures high water uptake and, consequently, high proton conductivity.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Densification and Proton Conductivity of La1-xBaxScO3-δ Electrolyte Membranes

et al. 2022

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“…Obviously, the XPS peaks of Sc 2p can be further deconvoluted into two groups of double peaks in Figure 2f, and the binding energy of 402.4 and 407.3 eV corresponded to the binding energy of Sc 3+ 2p 3/2 and Sc 3+ 2p 1/2 , 34 respectively. For another group of peaks, the binding energy of 2p 3/2 located at 401.4 eV for α-(Ba, Ca) 2 ScAlO 5 :Eu 3+ and that at 400.6 eV for β-(Ba, Ca) 2 ScAlO 5 :Eu 3+ are supposed to the Sc ε+ (0 < ε < 3, Sc 0 2p 3/2 = 399.5 eV, Sc 3+ 2p 3/2 = 402.4 eV), 35,36 which suggests the existence of different Sc polyhedrals in the two structures with increasing scandium content. Figure 2g shows the Al 2p XPS signal of phosphors.…”

Section: Methodsmentioning

confidence: 99%

Synthesis of the Red-Emitting (Ba, Ca)₂ScAlO₅:Eu³⁺ Phosphors with Photoluminescence Properties

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The light-emitting diodes (LED) are regarded as one of the most promising devices for inexpensive and widely used illumination; in particular, they are highly dependent on the development of red-emitting phosphors. Herein, we developed two types of red-emitting (Ba, Ca) 2 ScAlO 5 :Eu 3+ multiple excitations phosphors (λ ex = 255−465 nm) via freeze-drying followed by calcination. Powder X-ray diffraction and NMR results point out that they have hexagonal space group P6 3 /mmc (194), and the structural framework is composed of multi-coordinated Al 3+ −O 2− polyhedron and Sc 3+ −O 2− polyhedron. In addition, the valence state of europium (Eu 3+ ) is confirmed by X-ray photoelectron spectroscopy characterization. Investigation on the photoluminescence properties showed that the photoluminescence process of (Ba, Ca) 2 ScAlO 5 :Eu 3+ is attributable to the charge transfer band of Eu−O and abundant spectral terms of Eu 3+ . The α-(Ba, Ca) 2 ScAlO 5 :Eu 3+ and β-(Ba, Ca) 2 ScAlO 5 :Eu 3+ exhibited red emission under 465 and 395 nm excitation, respectively. The PL spectra and decay curves explain the intrinsic photoluminescence mechanism. The strongest emission peaks of the red-emitting α-(Ba, Ca) 2 ScAlO 5 :Eu 3+ and β-(Ba, Ca) 2 ScAlO 5 :Eu 3+ phosphors are at 615 and 619 nm, respectively, exhibiting a high fluorescence of 64 and 67% under the temperature of 423 K (150 °C). Further exploration of the red-emitting phosphors would provide a variety of choices for the design of red LEDs and white LEDs for the solid-state lighting system.

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“…One of the most promising proton-conducting materials studied so far for PCFC applications are strontium doped lanthanum scandates La 1− x Sr x ScO 3− α . These oxides show applicable values of ionic conductivity and great stability in highly reductive atmospheres [19,20,[32][33][34][35][36][37][38][39][40][41][42][43][44][45]. While H 2 /D 2 pulsed isotope exchange on BaZrO 3 and BaCeO 3 based oxides was studied in Ref.…”

Section: Introductionmentioning

confidence: 99%

H/D isotopic exchange and electrochemical kinetics of hydrogen oxidation on Ni-cermets with oxygen-ionic and protonic electrolytes

Захаров

Tropin

Осинкин

et al. 2022

Journal of Power Sources

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Oxygen isotope exchange in proton-conducting oxides based on lanthanum scandates

Cited by 12 publications

References 32 publications

Densification and Proton Conductivity of La1-xBaxScO3-δ Electrolyte Membranes

Densification and Proton Conductivity of La1-xBaxScO3-δ Electrolyte Membranes

Synthesis of the Red-Emitting (Ba, Ca)₂ScAlO₅:Eu³⁺ Phosphors with Photoluminescence Properties

H/D isotopic exchange and electrochemical kinetics of hydrogen oxidation on Ni-cermets with oxygen-ionic and protonic electrolytes

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Oxygen isotope exchange in proton-conducting oxides based on lanthanum scandates

Cited by 12 publications

References 32 publications

Densification and Proton Conductivity of La1-xBaxScO3-δ Electrolyte Membranes

Densification and Proton Conductivity of La1-xBaxScO3-δ Electrolyte Membranes

Synthesis of the Red-Emitting (Ba, Ca)2ScAlO5:Eu3+ Phosphors with Photoluminescence Properties

H/D isotopic exchange and electrochemical kinetics of hydrogen oxidation on Ni-cermets with oxygen-ionic and protonic electrolytes

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Synthesis of the Red-Emitting (Ba, Ca)₂ScAlO₅:Eu³⁺ Phosphors with Photoluminescence Properties