Proton conductivity and mobility in Sr-doped LaScO3 perovskites

Lesnichyova, A.S.; Belyakov, S. A.; Stroeva, А. Yu.; Кузьмин, А. В.

doi:10.1016/j.ceramint.2020.10.189

Cited by 19 publications

(9 citation statements)

References 45 publications

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“…The partial conductivities of protons, oxygen ions, and holes were calculated on the basis of the dependences of the total conductivity on pO2 and pH2O in the framework of the approach developed by Frade [44] and Baek [45]. A detailed description of the calculations is given in [24]. The experimental dependences of total conductivity on (pO2) 1/4 , which were obtained at two humidity values 2.8 kPa and 0.1 kPa, were used for the calculations and are given in the Supplementary Materials (Figure S1).…”

Section: Methodsmentioning

confidence: 99%

“…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

et al. 2022

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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: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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

et al. 2022

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“…In this regard, attempts are being made to create similar materials containing no alkaline earth metals. Among them are promising systems based on complex oxides of lanthanum with titanium, zirconium, tin, cerium, or niobium [249][250][251][252], as well as lanthanum oxides with trivalent elements LaXO 3 with a perovskite structure [253][254][255]. However, the practical application of these materials is currently constrained by the relatively high ohmic losses of FCs based on them [256][257][258].…”

Section: Membranes In Fuel Cellsmentioning

confidence: 99%

Membrane Technologies for Decarbonization

Alent’ev

Волков

Воротынцев

et al. 2021

Membr. Membr. Technol.

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The deteriorating environmental situation has stimulated the world community to develop research related to the decarbonization of the economy and hydrogen energy. These two areas are essentially focused on membrane technologies, which play a crucial role in solving key tasks for these areas. This review is devoted to this research. The first part describes various membrane technologies aimed at capturing CO 2 from the most common gas mixtures, primarily containing nitrogen, methane, and hydrogen. In recent years, studies related to the amine purification of CO 2 , including membrane technologies, and the use of porous membranes filled with ionic liquids has also been intensively developed. Electromembrane technologies are also being developed that allow not only capture of CO 2 but also to process it into fuel or valuable chemicals. The course taken by several developed countries, including Russia, for the development of hydrogen energy includes the production, purification of hydrogen, and its conversion into energy. It should be noted that membrane technologies are fundamentally important for the development of each of these areas. Thus, the evolution of hydrogen is possible with the use of polymer membranes, and for deep purification and production of high-purity hydrogen by membrane catalysis; membranes based on palladium alloys are used. Finally, fuel cells are developed to produce energy from hydrogen, the most important part of which are proton or oxygen-conducting membranes.

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“…The well-studied orthorhombic-doped perovskite LaScO 3 exhibits high oxygen-ionic and proton conductivities. This complex oxide has been successfully doped into various sublattices [27][28][29][30][31][32][33][34][35][36][37][38][39][40][41]. In a dry atmosphere, acceptor-doped LaScO 3 is a mixed oxygen ion and hole conductor.…”

Section: Introductionmentioning

confidence: 99%

Crystal Structure, Electrical Conductivity and Hydration of the Novel Oxygen-Deficient Perovskite La2ScZnO5.5, Doped with MgO and CaO

et al. 2022

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This paper demonstrates the possibility of creating oxygen deficiency in perovskites A+3B+3O3 by introducing two types of cations with different charges into the B-sublattice. For this, it is proposed to introduce a two-charged cation, for example, Zn2+, as an alternative to alkaline earth metals. Previously, this possibility was demonstrated for aluminate LaAlO3 and indate LaInO3. In this article, we have focused on the modification of the scandium-containing perovskite LaScO3. The novel oxygen-deficient perovskite La2ScZnO5.5 and doped phases La1.9Ca0.1ScZnO5.45, La2Sc0.9Ca0.1ZnO5.45, and La2Sc0.9Mg0.1ZnO5.45 were obtained via a solid-state reaction process. Their phase composition and hydration were investigated by XRD and TGA + MS techniques. The conductivities of these materials were measured by the electrochemical impedance technique under atmospheres of various water vapor partial pressures. All phases crystallized in orthorhombic symmetry with the Pnma space group. The phases were capable of reversible water uptake; the proton concentration increased in the order of La2ScZnO5.5 < La2Sc0.9Mg0.1ZnO5.45 < La2Sc0.9Ca0.1ZnO5.45 ≈ La1.9Ca0.1ScZnO5.45 and reached ~90% hydration limit for Ca2+-doped phases. The total conductivities increased with the increase in the free lattice volume in the sequence of σLa2ScZnO5.5 < σLa2Sc0.9Mg0.1ZnO5.45 < σLa1.9Ca0.1ScZnO5.45 < σLa2Sc0.9Ca0.1ZnO5.45, the activation energy decreased in the same sequence. The sample La2Sc0.9Ca0.1ZnO5.45 showed the highest conductivity of about 10−3 S∙cm−1 at 650 °C (dry air pH2O = 3.5·10−5 atm). Water incorporation was accompanied by an increase in conductivity in wet air (pH2O = 2·10−2 atm) due to the appearance of proton conductivity. The sample La2Sc0.9Ca0.1ZnO5.45 showed a conductivity of about 10−5 S∙cm−1 at 350 °C (pH2O = 2·10−2 atm). A comparison of conductivities of obtained phase La2ScZnO5.5 with the conductivities of La2AlZnO5.5 and La2InZnO5.5 was made; the nature of the B-cation did not significantly affect the total conductivity.

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Proton conductivity and mobility in Sr-doped LaScO3 perovskites

Cited by 19 publications

References 45 publications

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

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

Membrane Technologies for Decarbonization

Crystal Structure, Electrical Conductivity and Hydration of the Novel Oxygen-Deficient Perovskite La2ScZnO5.5, Doped with MgO and CaO

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