Influence of Ce doping and thickness on the structure and non-Fermi liquid behavior of LaNiO3 thin films

Soni, Kartik; Yadav, Ekta; Harisankar, S.; Mavani, K. R.

doi:10.1016/j.jpcs.2020.109398

Cited by 11 publications

(4 citation statements)

References 28 publications

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“…Excluding the influence of carbon cloth, all samples presented three E g Raman modes located at 156 cm −1 , 435 cm −1 , and 551 cm −1 , which describe La displacements, Ni—O bond bending and Ni—O bond stretching respectively. [ 71 , 72 ] In comparison with the sample before testing, the La displacing mode in LNCO55‐Ar cathode decreased, indicating evolution of La from the perovskite structure. This phenomenon is consistent with the XRD and XPS results.…”

Section: Resultsmentioning

confidence: 99%

An Efficient Symmetric Electrolyzer Based On Bifunctional Perovskite Catalyst for Ammonia Electrolysis

Zhang

Duan

et al. 2021

Advanced Science

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Ammonia is a natural pollutant in wastewater and removal technique such as ammonia electro-oxidation is of paramount importance. The development of highly efficient and low-costing electrocatalysts for the ammonia oxidation reaction (AOR) and hydrogen evolution reaction (HER) associated with ammonia removal is subsequently crucial. In this study, for the first time, the authors demonstrate that a perovskite oxide LaNi 0.5 Cu 0.5 O 3-𝜹 after being annealed in Ar (LNCO55-Ar), is an excellent non-noble bifunctional catalyst towards both AOR and HER, making it suitable as a symmetric ammonia electrolyser (SAE) in alkaline medium. In contrast, the LNCO55 sample fired in air (LNCO55-Air) is inactive towards AOR and shows very poor HER activity. Through combined experimental results and theoretical calculations, it is found that the superior AOR and HER activities are attributed to the increased active sites, the introduction of oxygen vacancies, the synergistic effect of B-site cations and the different active sites in LNCO55-Ar. At 1.23 V, the assembled SAE demonstrates ≈100% removal efficiency in 2210 ppm ammonia solution and >70% in real landfill leachate. This work opens the door for developments towards bifunctional catalysts, and also takes a profound step towards the development of low-costing and simple device configuration for ammonia electrolysers.

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Section: Resultsmentioning

confidence: 99%

An Efficient Symmetric Electrolyzer Based On Bifunctional Perovskite Catalyst for Ammonia Electrolysis

Zhang

Duan

et al. 2021

Advanced Science

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“…The high-intensity peaks at 136 and 204 (cm –1 ) correspond to modes A 1 -1 and A 1 -3, respectively, while other phonon modes can be seen at 286 and 521, indicating the R3 – c structure of BFO. , With increasing Cd and Er concentrations in BFO, A g (1) mode broadening was found. The replacement of larger host cations by small-sized doped cations induces a compressive strain in the lattice at both (octahedral and tetrahedral) sites, resulting in a blue shift in the A g (1), A g (3), and E g (8) bands …”

Section: Results and Discussionmentioning

confidence: 99%

“…The replacement of larger host cations by small-sized doped cations induces a compressive strain in the lattice at both (octahedral and tetrahedral) sites, resulting in a blue shift in the A g (1), A g (3), and E g (8) bands. 27 …”

Section: Results and Discussionmentioning

confidence: 99%

Optical, Photocatalytic, Electrochemical, Magnetic, Dielectric, and Ferroelectric Properties of Cd- and Er-Doped BiFeO₃ Prepared via a Facile Microemulsion Route

et al. 2023

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A series of Cd-and Er-doped bismuth ferrites were synthesized using a simple microemulsion technique. The influence of Cd and Er doping on the structural, ferroelectric, photocatalytic, and dielectric properties of bismuth ferrite (BFO) was examined in this research. The prepared materials were examined by Xray diffraction, Raman, scanning electron microscopy, and UV−vis techniques. The XRD patterns reflected the formation of a monophasic rhombohedral structure with the space group R3 − c and an average crystallite size calculated to be in the range of 29 to 32 nm. The saturation polarization (P s ), coercivity (H c ), and retentivity (P r ) of the materials were investigated by a hysteresis loop (P-E), and it was perceived that increasing the dopant contents improved the P s and P r values, which may be due to the variation of metal cation valence states. In accordance with the photoluminescence (PL) spectra, a highly substituted material displayed lower recombination and increased charge separation rate (e − −h + ), which eventually contributed to a higher photocatalytic degradation performance of the prepared NMs. Furthermore, as the frequency and dopant concentration increased, the dielectric loss decreased, which could be due to different types of polarization. Bi 1 − x Cd x Fe 1 − y Er y O 3 showed well-saturated hysteresis loops (P-E) with enhanced saturation polarization near 9.7 × 10 −4 μC•cm −2 . The remnant polarization of the BFO and BFOCE NPs was 2.26 × 10 −4 and 8.11 × 10 −4 μC• cm −2 , respectively, under a maximum electric field, which may be due to the variation of the metal cation valence states. The improved ferroelectric and dielectric properties of Bi 1 − x Cd x Fe 1 − y Er y O 3 NPs are attributed to the reduced concentration of defects, the different domain behavior, and the valence state of Cd and Er ions. The electrochemical (crystal violet (CV) and I−V) properties of Bi 1 − x Cd x Fe 1 − y Er y O 3 were all influenced by the dopant concentrations (Cd and Er). The synergistic effects of Cd and Er on the substituted material enhanced the specific capacitance in comparison to undoped BiFeO 3 . The photocatalytic activity to degrade CV under visible irradiation increased in BFOCE as the dopant (x,y) concentration increased from 0 to 0.25 by showing 84% dye degradation in comparison to pristine BiFeO 3 (53% only) within 120 min under visible light. Moreover, the stability of these prepared nanoparticles was confirmed using recycling experiments, with the results indicating that the synthesized nanomaterials demonstrated promising stability and reusability.

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“…The Raman spectra of the fresh LaNiO 3 and LaFeO 3 presented in Figure 2b are consistent with the previously reported data. 52,53 Specifically, the peaks at 457 cm −1 on LaNiO 3 and 644 cm −1 on LaFeO 3 correspond to the BO 6 (B = Ni and Fe) octahedral vibration modes. In the case of La 2 NiFeO 6 , the band is located between the peaks of LaNiO 3 and LaFeO 3 (579 cm −1 ), revealing that both Fe and Ni cations are distributed to the octahedral B-site.…”

Section: Methodsmentioning

confidence: 99%

Fundamental Aspects of Enhancing Low-Temperature CO₂ Splitting to CO on a Double La₂NiFeO₆ Perovskite

et al. 2021

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This paper addresses the synergistic effect of binary Ni–Fe sites in double La2NiFeO6 perovskite on low-temperature CO2 conversion to CO in the reverse water–gas shift-chemical looping process. Experimental investigations and DFT calculations proved that, for the reduction of perovskite, the Ni-site facilitates the formation of surface oxygen vacancies and the adsorption of hydrogen with agile lattice oxygen mobility. Thus, incorporating Ni can improve the reducibility at low temperature. The Fe-site prevents strong adsorption of the CO2 molecules on the La-site to facilitate its direct dissociation into CO molecules, and thereby CO2 conversion increases with Fe loading. Consequently, La2NiFeO6 can satisfy both high reducibility and CO2 splitting activity by the synergy of binary Ni–Fe sites. It presents an average CO productivity of 2.14 mmol/gcat and a maximum CO production rate of 1.69 mmol/gcat·min at 700 °C, more than 4.7-fold and 10-fold higher than each single LaNiO3 and LaFeO3 perovskites, respectively.

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Influence of Ce doping and thickness on the structure and non-Fermi liquid behavior of LaNiO3 thin films

Cited by 11 publications

References 28 publications

An Efficient Symmetric Electrolyzer Based On Bifunctional Perovskite Catalyst for Ammonia Electrolysis

An Efficient Symmetric Electrolyzer Based On Bifunctional Perovskite Catalyst for Ammonia Electrolysis

Optical, Photocatalytic, Electrochemical, Magnetic, Dielectric, and Ferroelectric Properties of Cd- and Er-Doped BiFeO₃ Prepared via a Facile Microemulsion Route

Fundamental Aspects of Enhancing Low-Temperature CO₂ Splitting to CO on a Double La₂NiFeO₆ Perovskite

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Influence of Ce doping and thickness on the structure and non-Fermi liquid behavior of LaNiO3 thin films

Cited by 11 publications

References 28 publications

An Efficient Symmetric Electrolyzer Based On Bifunctional Perovskite Catalyst for Ammonia Electrolysis

An Efficient Symmetric Electrolyzer Based On Bifunctional Perovskite Catalyst for Ammonia Electrolysis

Optical, Photocatalytic, Electrochemical, Magnetic, Dielectric, and Ferroelectric Properties of Cd- and Er-Doped BiFeO3 Prepared via a Facile Microemulsion Route

Fundamental Aspects of Enhancing Low-Temperature CO2 Splitting to CO on a Double La2NiFeO6 Perovskite

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Product

Resources

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Optical, Photocatalytic, Electrochemical, Magnetic, Dielectric, and Ferroelectric Properties of Cd- and Er-Doped BiFeO₃ Prepared via a Facile Microemulsion Route

Fundamental Aspects of Enhancing Low-Temperature CO₂ Splitting to CO on a Double La₂NiFeO₆ Perovskite