Water incorporation into the Ba2(In1− xMx)2O5‪ (M=Sc3+ 0≤x&lt;0.5 and M=Y3+ 0≤x&lt;0.35) system and protonic conduction

Noirault, Samuel; Quarez, Éric; Piffard, Y.; Joubert, Olivier

doi:10.1016/j.ssi.2009.06.010

Cited by 18 publications

(5 citation statements)

References 14 publications

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“…The diffusion coefficient, D H + , can be extracted using the Nernst-Einstein relation with the proton number and conductivity evolution as a function of temperature obtained from TGA and EIS. 46 As illustrated in Fig. 3c, D H + follows an Arrhenius law with low proton activation energies (0.43 eV), consistent with reported literature values.…”

Section: Resultssupporting

confidence: 90%

Location of deuterium sites at operating temperature from neutron diffraction of BaIn_0.6Ti_0.2Yb_0.2O_2.6−n(OH)_2n, an electrolyte for proton-solid oxide fuel cells

Jarry

Joubert

Suard

et al. 2016

Phys. Chem. Chem. Phys.

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A fundamental understanding of the doping effect on the hydration mechanism and related proton diffusion pathways are keys to the progress of Proton-Solid Oxide Fuel Cell (H(+)-SOFC) technologies. Here, we elucidate the possible interplay between the crystal structure upon hydration and the conductivity properties in a promising perovskite type H(+)-SOFC electrolyte, BaIn0.6Yb0.2Ti0.2O2.6-n(OH)2n. Thermal X-ray and neutron diffractions, neutron time-of-flight scattering along with thermal gravimetric analysis reveal the structural features of BaIn0.6Ti0.2Yb0.2O2.6-n(OH)2n at fuel cell operating temperatures. Between 400-600 °C, BaIn0.6Yb0.2Ti0.2O2.6-n(OD)2n (n < 0.042) remains in a disordered perovskite structure with high anisotropies in the form of oblate spheroids for oxygen. At 400 °C, the presence of oxygen and proton static disorder is clearly established. Yet, the insertion of mobile protons in 24k sites does not induce long-range structural distortion while facilitating both inter- and intra-octahedral proton transfers via quasi-linear O-DO bonds, strong hydrogen bonding, and octahedral tilting. This experimental evidence reveals that the co-doping approach on Ba2In2O5 enhances greatly protonic conductivity levels by enabling a continuous proton diffusion pathway through BaIn0.6Yb0.2Ti0.2O2.6-n(OH)2n. These new insights into the doping effect on the proton-transfer mechanism offer new perspectives for the development of H(+)-SOFC electrolyte materials.

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Section: Resultssupporting

confidence: 90%

Location of deuterium sites at operating temperature from neutron diffraction of BaIn_0.6Ti_0.2Yb_0.2O_2.6−n(OH)_2n, an electrolyte for proton-solid oxide fuel cells

Jarry

Joubert

Suard

et al. 2016

Phys. Chem. Chem. Phys.

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“…Unlike the ABO 3 perovskites and the complex perovskites, which may at maximum incorporatẽ 20-30 mol% protons, the brownmillerites are capable of absorbing up to 1 mol H 2 O per mol oxide due to their large oxygen deficiencies. As proton conductors, they perform reasonably well, with their proton conductivity peaking at around 4-6 mS cm −1 at 400-600 • C for Ti-substituted Ba 2 In 2 O 5 and Ba 2 Sc 2 O 5 [186][187][188][189][190][191][192]. However, due to the large concentrations of protons, these materials display significant chemical expansion, with corresponding volume expansions of more than +3% for pure Ba [189], β hydr is estimated to be 0.067 per mol H 2 O, that is, approximately half of the value determined for BZY ( Figure 5).…”

Section: Ca-and Sr-based Perovskitesmentioning

confidence: 99%

Thermal and Chemical Expansion in Proton Ceramic Electrolytes and Compatible Electrodes

2018

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This review paper focuses on the phenomenon of thermochemical expansion of two specific categories of conducting ceramics: Proton Conducting Ceramics (PCC) and Mixed Ionic-Electronic Conductors (MIEC). The theory of thermal expansion of ceramics is underlined from microscopic to macroscopic points of view while the chemical expansion is explained based on crystallography and defect chemistry. Modelling methods are used to predict the thermochemical expansion of PCCs and MIECs with two examples: hydration of barium zirconate (BaZr1−xYxO3−δ) and oxidation/reduction of La1−xSrxCo0.2Fe0.8O3−δ. While it is unusual for a review paper, we conducted experiments to evaluate the influence of the heating rate in determining expansion coefficients experimentally. This was motivated by the discrepancy of some values in literature. The conclusions are that the heating rate has little to no effect on the obtained values. Models for the expansion coefficients of a composite material are presented and include the effect of porosity. A set of data comprising thermal and chemical expansion coefficients has been gathered from the literature and presented here divided into two groups: protonic electrolytes and mixed ionic-electronic conductors. Finally, the methods of mitigation of the thermal mismatch problem are discussed.

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“…These activation energies are much lower than those for long term proton migration, and the authors ascribe them to intra-octahedral proton transfers close to the dopant atom. Doped Ba 2 In 2 O 5 has also attracted interest for its high proton conductivity in wet atmospheres, and water incorporation into Ba 2 In 2Àx M x O 5 (M = Sc, 0 r x o 1.0, and M = Y, 0 r x o 0.7) has been studied in detail by Noirault et al 150 The results showed that the thermal stability increased with increasing x. The composition, Ba 2 In 1.3 Sc 0.7 O 4.2 (OH) 1.6 showed the highest conductivity of 5 Â 10 À3 s cm À1 at 350 1C.…”

Section: Proton Conductorsmentioning

confidence: 99%

Conducting solids

Kendrick

Slater

2010

Annu. Rep. Prog. Chem., Sect. A: Inorg. Chem.

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Water incorporation into the Ba2(In1− xMx)2O5‪ (M=Sc3+ 0≤x<0.5 and M=Y3+ 0≤x<0.35) system and protonic conduction

Cited by 18 publications

References 14 publications

Location of deuterium sites at operating temperature from neutron diffraction of BaIn_0.6Ti_0.2Yb_0.2O_2.6−n(OH)_2n, an electrolyte for proton-solid oxide fuel cells

Location of deuterium sites at operating temperature from neutron diffraction of BaIn_0.6Ti_0.2Yb_0.2O_2.6−n(OH)_2n, an electrolyte for proton-solid oxide fuel cells

Thermal and Chemical Expansion in Proton Ceramic Electrolytes and Compatible Electrodes

Conducting solids

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Water incorporation into the Ba2(In1− xMx)2O5‪ (M=Sc3+ 0≤x<0.5 and M=Y3+ 0≤x<0.35) system and protonic conduction

Cited by 18 publications

References 14 publications

Location of deuterium sites at operating temperature from neutron diffraction of BaIn0.6Ti0.2Yb0.2O2.6−n(OH)2n, an electrolyte for proton-solid oxide fuel cells

Location of deuterium sites at operating temperature from neutron diffraction of BaIn0.6Ti0.2Yb0.2O2.6−n(OH)2n, an electrolyte for proton-solid oxide fuel cells

Thermal and Chemical Expansion in Proton Ceramic Electrolytes and Compatible Electrodes

Conducting solids

Contact Info

Product

Resources

About

Location of deuterium sites at operating temperature from neutron diffraction of BaIn_0.6Ti_0.2Yb_0.2O_2.6−n(OH)_2n, an electrolyte for proton-solid oxide fuel cells

Location of deuterium sites at operating temperature from neutron diffraction of BaIn_0.6Ti_0.2Yb_0.2O_2.6−n(OH)_2n, an electrolyte for proton-solid oxide fuel cells