Valence and spin states in delafossite<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mi mathvariant="normal">Ag</mml:mi><mml:mi mathvariant="normal">Ni</mml:mi><mml:msub><mml:mi mathvariant="normal">O</mml:mi><mml:mn>2</mml:mn></mml:msub></mml:mrow></mml:math>and the frustrated Jahn-Teller system<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mi>A</mml:mi><mml:mi mathvariant="normal">Ni</mml:mi><mml:msub><mml:mi mathvariant=

Kang, J.-S.; Lee, S. S.; Kim, G.; Lee, Hongjoo J.; Song, Hun Ho; Shin, Yu-Ju; Han, Sang Wook; Hwang, Chanyong; Jung, Min-Cherl; Shin, Hyun Joon; Kim, B. H.; Kwon, S. K.; Min, B. I.

doi:10.1103/physrevb.76.195122

Cited by 32 publications

(15 citation statements)

References 29 publications

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“…To assess sample stoichiometry, x-ray absorption experiments at the Ni L 2,3 edges have been done in some of the films (14 nm). It was found that in all cases the L 2 line does not show any evidence of the characteristic splitting occurring in the presence of Ni 2+ species (as in NiO) [21], and the L 3 edge shows the double-peak structure commonly found in Ni 3+ nickelates [22,23]. We thus conclude that these films are essentially stoichiometric.…”

Section: Methodsmentioning

confidence: 60%

Multiple strain-induced phase transitions inLaNiO3thin films

et al. 2016

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Strain effects on epitaxial thin films of LaNiO 3 grown on different single crystalline substrates are studied by Raman scattering and first-principles simulation. New Raman modes, not present in bulk or fully relaxed films, appear under both compressive and tensile strains, indicating symmetry reductions. Interestingly, the Raman spectra and the underlying crystal symmetry for tensile and compressively strained films are different. Extensive mapping of LaNiO 3 phase stability is addressed by simulations, showing that a variety of crystalline phases are indeed stabilized under strain. The calculated Raman frequencies reproduce the principal features of the experimental spectra, supporting the validity of the multiple strain-driven structural transitions predicted by the simulations.

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Section: Methodsmentioning

confidence: 60%

Multiple strain-induced phase transitions inLaNiO3thin films

et al. 2016

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“…As Fig. 4d shows, the Ni L 3 -edge shoulder peak shifts from 855.1 eV (PBA-0) to 855.6 eV (PBA-60), indicating that surface Ni 2+ ions were partially oxidized to Ni 3+ after N 2 plasma bombardment 37,38 (Supplementary Fig. 25).…”

Section: Resultsmentioning

confidence: 98%

Unconventional CN vacancies suppress iron-leaching in Prussian blue analogue pre-catalyst for boosted oxygen evolution catalysis

et al. 2019

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The incorporation of defects, such as vacancies, into functional materials could substantially tailor their intrinsic properties. Progress in vacancy chemistry has enabled advances in many technological applications, but creating new type of vacancies in existing material system remains a big challenge. We show here that ionized nitrogen plasma can break bonds of iron-carbon-nitrogen-nickel units in nickel-iron Prussian blue analogues, forming unconventional carbon-nitrogen vacancies. We study oxygen evolution reaction on the carbon-nitrogen vacancy-mediated Prussian blue analogues, which exhibit a low overpotential of 283 millivolts at 10 milliamperes per square centimeter in alkali, far exceeding that of original Prussian blue analogues and previously reported oxygen evolution catalysts with vacancies. We ascribe this enhancement to the in-situ generated nickel-iron oxy(hydroxide) active layer during oxygen evolution reaction, where the Fe leaching was significantly suppressed by the unconventional carbon-nitrogen vacancies. This work opens up opportunities for producing vacancy defects in nanomaterials for broad applications.

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“…To develop a more efficient visible light, photocatalyst is substantive to meet the requirements of future environmental and energy technologies driven by solar energy. ABO 2 materials offer some unique material properties and are viable to modify their chemical composition and microstructure by ion exchange, making them interesting candidate for visible light photocatalytic applications …”

Section: Introductionmentioning

confidence: 99%

Facile Ion‐Exchange Synthesis and Visible Light Photocatalytic Studies of Cu²⁺, Sn²⁺, and Ag⁺‐Substituted LiMg_0.5Ti_0.5O₂

et al. 2014

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A novel series of visible light‐sensitive Cu2+, Sn2+, and Ag+‐substituted LiMg0.5Ti0.5O2 photocatalysts were synthesized by a facile ion‐exchange method and characterized by XRD, UV‐Vis diffuse reflectance spectra, scanning electron microscopy equipped with an X‐ray energy‐dispersive spectroscopy, Brunauer‐Emmett‐Teller surface area, inductively coupled plasma mass spectrometry, and thermal gravimetric analysis. The characterization results showed that morphology, crystallite size, and surface areas of the ion‐exchange products were almost similar to the parent compound. Absorption edges of Ag+‐doped (AMT), Cu2+‐doped (CMT), and Sn2+‐doped (SMT) samples were red shifted remarkably into the visible light region while parent LiMg0.5Ti0.5O2 (LMT) was UV active. Photocatalytic activity of these samples was evaluated by studying the degradation of methylene blue and nitro benzene under visible light irradiation and the stability of all samples during photocatalytic experiment was also investigated. The activity of all photocatalysts was ranked accordingly as SMT ≥ AMT > CMT > LMT. The correlation between photocatalytic properties, band gap energy, rate of recombination of the charge carriers, and amount of ●OH radicals generated during photocatalysis and the underlying reasons were discussed.

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Valence and spin states in delafossiteAgNiO2and the frustrated Jahn-Teller systemANi

Cited by 32 publications

References 29 publications

Multiple strain-induced phase transitions inLaNiO3thin films

Multiple strain-induced phase transitions inLaNiO3thin films

Unconventional CN vacancies suppress iron-leaching in Prussian blue analogue pre-catalyst for boosted oxygen evolution catalysis

Facile Ion‐Exchange Synthesis and Visible Light Photocatalytic Studies of Cu²⁺, Sn²⁺, and Ag⁺‐Substituted LiMg_0.5Ti_0.5O₂

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Valence and spin states in delafossiteAgNiO2and the frustrated Jahn-Teller systemANi

Cited by 32 publications

References 29 publications

Multiple strain-induced phase transitions inLaNiO3thin films

Multiple strain-induced phase transitions inLaNiO3thin films

Unconventional CN vacancies suppress iron-leaching in Prussian blue analogue pre-catalyst for boosted oxygen evolution catalysis

Facile Ion‐Exchange Synthesis and Visible Light Photocatalytic Studies of Cu2+, Sn2+, and Ag+‐Substituted LiMg0.5Ti0.5O2

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Product

Resources

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Facile Ion‐Exchange Synthesis and Visible Light Photocatalytic Studies of Cu²⁺, Sn²⁺, and Ag⁺‐Substituted LiMg_0.5Ti_0.5O₂