Thin Films: Engineering Mixed Ionic Electronic Conduction in La0.8Sr0.2MnO3+δ Nanostructures through Fast Grain Boundary Oxygen Diffusivity (Adv. Energy Mater. 11/2015)

Saranya, Aruppukottai M.; Pla, Dolors; Morata, Álex; Cavallaro, Antonino; Canales‐Vázquez, Jesús; Kilner, John A.; Burriel, Mónica; Tarancón, Albert

doi:10.1002/aenm.201570064

Cited by 5 publications

(3 citation statements)

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“…Looking beyond the (La,Ba,Sr)(Fe,Co)O 3−δ system, we find that the main result also agrees well with the observation of faster grain-boundary diffusion of oxygen in the (La,Sr)MnO 3+δ perovskites. [58][59][60][61] Compared with (La,Ba,Sr)(Fe,Co)O 3−δ perovskites, (La,Sr)MnO 3+δ is an oxygen hyperstoichiometric material, with the excess oxygen arising from the presence of cation vacancies. These defects depress the concentration of oxygen vacancies through a Schottky equilibrium, [62][63][64][65][66][67] and they also diminish the oxygen-vacancy diffusivity.…”

Section: Discussionmentioning

confidence: 99%

Oxygen grain-boundary diffusion in (La,Sr)FeO_3−δ perovskite-oxides probed by molecular-dynamics simulations

Bonkowski,

Kilner,

De Souza

2024

RSC Appl. Interfaces

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Section: Discussionmentioning

confidence: 99%

Oxygen grain-boundary diffusion in (La,Sr)FeO_3−δ perovskite-oxides probed by molecular-dynamics simulations

Bonkowski,

Kilner,

De Souza

2024

RSC Appl. Interfaces

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“…The grain boundary diffusion products to be presented in figure 4 were obtained from these profiles according to the more accurate analysis proposed by Chung and Wuensch (20) . ⁄ ) [1] Note that the analysis employed here assumes that the rate of oxygen incorporation at the surface may be represented by a single effective k* value, although recent numerical analyses on nanocrystalline thin film samples have extracted separate surface exchange coefficient values for grain surfaces and grain boundaries (25,26).…”

Section: Isotope Exchange Measurementsmentioning

confidence: 99%

“…The present values for LaCo 0.6 Ni 0.4 O 3 are at least two orders of magnitude higher than those for La 0.8 Sr 0.2 MnO 3 , a similar enhancement as seen for the bulk diffusivity in figure 2(a). Given the high grain boundary diffusivities, there may be opportunities to enhance the macroscopic oxygen diffusivity by tailoring the microstructure to have a high density of grain boundaries, as recently explored for La 0.8 Sr 0.2 MnO 3 (25,26). Given the higher bulk and grain boundary diffusivities, for LaCo 0.6 Ni 0.4 O 3 , one might expect a greater improvement is possible by applying the same principles to this material.…”

Section: Isotope Exchange Measurementsmentioning

confidence: 99%

(Invited) Surface Composition and Oxygen Exchange Properties of Alkaline Earth-Free Perovskites; LaCo_0.6Ni_0.4O₃

et al. 2016

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It is well known that alkaline earth additives in conventional perovskite-based solid oxide electrode materials tend to segregate rapidly to the outer surfaces, which is associated with degradation in device performance. It may be possible to avoid these problems by developing materials which do not contain alkaline earth dopants; however, without the oxygen vacancies introduced by alkaline earth doping, the oxygen transport and electro-catalytic properties may suffer. Here, we investigate oxygen transport in the nickel doped lanthanum cobaltite system, and find that the relatively low oxygen diffusivity is dominated by grain boundary transport. Despite this, at higher temperatures, the surface exchange coefficient is comparable to state-of-the-art Sr doped cobaltites. The surface composition of the annealed samples measured by Low Energy Ion Scattering spectroscopy does not appear different from the as-polished samples, suggesting that the surface composition is indeed more stable for this alkaline earth free material.

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Tailoring Multilayered BiVO₄ Photoanodes by Pulsed Laser Deposition for Water Splitting

Murcia-López

Fàbrega

Monllor-Satoca

et al. 2016

ACS Appl. Mater. Interfaces

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Pulsed laser deposition (PLD) is proposed as promising technique for the fabrication of multilayered BiVO4-based photoanodes. For this purpose, bare BiVO4 films and two heterojunctions, BiVO4/SnO2 and BiVO4/WO3/SnO2, have been prepared using consecutive ablation of assorted targets in a single batch. The ease, high versatility and usefulness of this technique in engineering the internal configuration of the photoanode with stoichiometric target-to-substrate transfer are demonstrated. The obtained photocurrent densities are among the highest reported values for undoped BiVO4 without oxygen evolution catalysts (OEC). A detailed analysis of the influence of SnO2 and WO3 layers on the charge transport properties because of the changes at the internal FTO/semiconductor interface is performed through transient photocurrent measurements (TPC), showing that the BiVO4/WO3/SnO2 heterostructure attains a significant decrease in the internal losses and reaches high photocurrent values. This study is expected to open the door to the fabrication of other systems based on ternary (or even more complex) metal oxides as photoanodes for water splitting, which is a promising alternative for obtaining materials able to fulfill the different requierements in the development of more efficient systems for this process.

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Thin Films: Engineering Mixed Ionic Electronic Conduction in La_0.8Sr_0.2MnO_3+δ Nanostructures through Fast Grain Boundary Oxygen Diffusivity (Adv. Energy Mater. 11/2015)

Cited by 5 publications

References 0 publications

Oxygen grain-boundary diffusion in (La,Sr)FeO_3−δ perovskite-oxides probed by molecular-dynamics simulations

Oxygen grain-boundary diffusion in (La,Sr)FeO_3−δ perovskite-oxides probed by molecular-dynamics simulations

(Invited) Surface Composition and Oxygen Exchange Properties of Alkaline Earth-Free Perovskites; LaCo_0.6Ni_0.4O₃

Tailoring Multilayered BiVO₄ Photoanodes by Pulsed Laser Deposition for Water Splitting

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Thin Films: Engineering Mixed Ionic Electronic Conduction in La0.8Sr0.2MnO3+δ Nanostructures through Fast Grain Boundary Oxygen Diffusivity (Adv. Energy Mater. 11/2015)

Cited by 5 publications

References 0 publications

Oxygen grain-boundary diffusion in (La,Sr)FeO3−δ perovskite-oxides probed by molecular-dynamics simulations

Oxygen grain-boundary diffusion in (La,Sr)FeO3−δ perovskite-oxides probed by molecular-dynamics simulations

(Invited) Surface Composition and Oxygen Exchange Properties of Alkaline Earth-Free Perovskites; LaCo0.6Ni0.4O3

Tailoring Multilayered BiVO4 Photoanodes by Pulsed Laser Deposition for Water Splitting

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Product

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Thin Films: Engineering Mixed Ionic Electronic Conduction in La_0.8Sr_0.2MnO_3+δ Nanostructures through Fast Grain Boundary Oxygen Diffusivity (Adv. Energy Mater. 11/2015)

Oxygen grain-boundary diffusion in (La,Sr)FeO_3−δ perovskite-oxides probed by molecular-dynamics simulations

Oxygen grain-boundary diffusion in (La,Sr)FeO_3−δ perovskite-oxides probed by molecular-dynamics simulations

(Invited) Surface Composition and Oxygen Exchange Properties of Alkaline Earth-Free Perovskites; LaCo_0.6Ni_0.4O₃

Tailoring Multilayered BiVO₄ Photoanodes by Pulsed Laser Deposition for Water Splitting