Yttrium dependent space charge effect on modulating the conductivity of barium zirconate electrolyte for solid oxide fuel cell

Uthayakumar, Aarthi; Pandiyan, Arunkumar; Moorthy, Suresh Babu Krishna

doi:10.1016/j.ijhydene.2018.10.185

Cited by 34 publications

(9 citation statements)

References 53 publications

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“…In the present material, both numerical and experimental studies have also reported the segregation of yttrium cations at grain boundaries [47][48][49][50], as found in zirconia and alumina. It is therefore plausible that the kinetics of cation transport in yttrium-doped barium zirconate is slower than in the undoped material, explaining the differences in diffusivities.…”

Section: Creep Parameterssupporting

confidence: 69%

High-temperature mechanical behavior of proton-conducting yttrium-doped barium zirconate perovskite

Ciria

Jiménez–Melendo

Aubin

et al. 2021

Journal of the European Ceramic Society

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Section: Creep Parameterssupporting

confidence: 69%

High-temperature mechanical behavior of proton-conducting yttrium-doped barium zirconate perovskite

Ciria

Jiménez–Melendo

Aubin

et al. 2021

Journal of the European Ceramic Society

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“…Barium chloride dihydrate (BaCl 2 ·2H 2 O, Himedia), zirconium oxychloride octahydrate (ZrOCl 2 ·8H 2 O, Himedia), yttrium nitrate hexahydrate (Y(NO 3 ) 3 ·6H 2 O), and sodium hydroxide (NaOH, Himedia) were used to prepare Y-doped BaZrO 3 with and without doping by a hydrothermal-assisted coprecipitation method . A 0.2 M precursor solution was prepared by dissolving a stoichiometric amount of BaCl 2 ·2H 2 O, ZrOCl 2 ·8H 2 O, and Y(NO 3 ) 3 ·6H 2 O (20 mol %) in 200 mL of distilled water.…”

Section: Methodsmentioning

confidence: 99%

“…Our earlier work highlighted the importance of yttrium (dopant) concentration on influencing the space charge potential and depletion layer width, which was found to be lower at 20 mol % doping. 25 Therefore, this study focuses on the addition of acceptor dopants (20 mol % Y) in the BaZrO 3 lattice and the effect of space charge along the grain boundary with respect to the sintering temperature.…”

mentioning

confidence: 99%

The Effect of Space Charge on Blocking Grain Boundary Resistance in an Yttrium-Doped Barium Zirconate Electrolyte for Solid Oxide Fuel Cells

et al. 2020

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The higher grain boundary resistance in the proton-conducting yttrium-doped barium zirconate is one of the major issues to be solved. A new strategy has been experimentally studied on the basis of space charge theory to understand the grain boundary resistance in pristine and 20 mol % yttrium-doped barium zirconate by varying the sintering temperature (1200, 1300, 1400, and 1500 °C). The electrical response upon applying a DC bias indicates the existence of space charge in the grain boundary region of barium zirconate. The Mott–Schottky analysis was performed at a lower temperature of 100 °C to infer the information from the grain boundary region. A parabolic reduction in normalized proton concentration was observed from the grain boundary to its core. The barrier height varied in the range of 0.55–0.15 V depending on the sintering temperature. The increase in dopant concentration along the grain boundary resulted in the reduction of barrier height as well as space charge width. Hence, the presence of yttrium and subsequent variation of the sintering temperature have a strong influence on space charge modulation and affect the grain boundary resistance.

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“…Continuing in this regard, the trapping effect is pacified for such compositions having the least difference between the host and dopant ionic radius. As an illustration, the highest proton conductivity was acquired with Y-doped BaZrO 3 over Gd- and Sm-doped BaZrO 3 from the works of Uthayakumar et al The following outcome is attributed to the difference in the ionic radius of the dopant and the host cation. Y 3+ ( r = 0.90 Å) and Zr 4+ ( r = 0.72 Å) share a minimum difference in ionic radius over Gd 3+ ( r = 0.938 Å) and Sm 3+ ( r = 0.958 Å), respectively.…”

Section: Proton Trapping In Bazro3mentioning

confidence: 99%

Factors Constituting Proton Trapping in BaCeO₃ and BaZrO₃ Perovskite Proton Conductors in Fuel Cell Technology: A Review

2022

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Urbanization with increasing demand for energy at a rapid pace has prompted researchers to explore effective and efficient energy storage technology. Fuel cells, being well-known among other existing devices, are categorized based on the nature of the electrolyte employed. In several areas, proton conduction solid oxide fuel cells have surpassed conventional solid oxide fuel cells. Nonetheless, there still prevail drawbacks accompanied with the proton-conducting electrolyte materials. However, the disadvantages associated with proton-conducting electrolytic materials persists. Besides chemical stability, one of the significant concerns is the fluctuation in proton conductivity among acceptor-doped compositions. Recent introspection interprets the proton trapping effect in the vicinity of the substituent attenuating proton mobility, the fundamentals of which point toward a proton-dopant complex interaction and altering basicity of the dopant neighboring oxygen atoms, escalating the activation energy. This implies a pronounced affinity of proton-trapped sites in the close coordination of the acceptor dopant while implying trap-free sites elsewhere. In the following review article, we direct our attention to the assimilation of factors responsible for the genesis of proton trapping sites with an additional motive to explore the optimal composition while achieving maximum productivity.

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Yttrium dependent space charge effect on modulating the conductivity of barium zirconate electrolyte for solid oxide fuel cell

Cited by 34 publications

References 53 publications

High-temperature mechanical behavior of proton-conducting yttrium-doped barium zirconate perovskite

High-temperature mechanical behavior of proton-conducting yttrium-doped barium zirconate perovskite

The Effect of Space Charge on Blocking Grain Boundary Resistance in an Yttrium-Doped Barium Zirconate Electrolyte for Solid Oxide Fuel Cells

Factors Constituting Proton Trapping in BaCeO₃ and BaZrO₃ Perovskite Proton Conductors in Fuel Cell Technology: A Review

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Yttrium dependent space charge effect on modulating the conductivity of barium zirconate electrolyte for solid oxide fuel cell

Cited by 34 publications

References 53 publications

High-temperature mechanical behavior of proton-conducting yttrium-doped barium zirconate perovskite

High-temperature mechanical behavior of proton-conducting yttrium-doped barium zirconate perovskite

The Effect of Space Charge on Blocking Grain Boundary Resistance in an Yttrium-Doped Barium Zirconate Electrolyte for Solid Oxide Fuel Cells

Factors Constituting Proton Trapping in BaCeO3 and BaZrO3 Perovskite Proton Conductors in Fuel Cell Technology: A Review

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Factors Constituting Proton Trapping in BaCeO₃ and BaZrO₃ Perovskite Proton Conductors in Fuel Cell Technology: A Review