Compressibility and structural stability of spinel-type MnIn2O4

Bekheet, Maged F.; Dubrovinsky, Leonid; Gurlo, Aleksander

doi:10.1016/j.jssc.2015.07.016

Cited by 14 publications

(2 citation statements)

References 51 publications

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“…The calcination of the Ni/Gd2O3/NiO sample doped with 5 at% of Gd in argon atmosphere led to an increase in the amount of Gd2O3 phase combined with the segregation of 2.3(3) wt% of metallic Ni. It has been reported that transition elements can be reduced during the thermal decomposition of organic carbon based-materials such as acetate or PVP materials in Ar atmosphere [60,61]. Moreover, the lattice parameter of NiO phase in this sample is quite similar to that of pure NiO nanofiber, confirming the segregation of Gd2O3 from the NiO lattice during the calcination in Ar atmosphere.…”

Section: Resultssupporting

confidence: 59%

Coaxial nanofibers of nickel/gadolinium oxide/nickel oxide as highly effective electrocatalysts for hydrogen evolution reaction

El-Maghrabi

Nada

Bekheet

et al. 2021

Journal of Colloid and Interface Science

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Cost-effective, active and stable electrocatalysts are pivotal to hydrogen production via electrocatalytic water splitting. Here we report on the preparation of novel nanofiber (NF) Ni/Gd2O3/NiO heterostructures by an electrospinning technique. The fabricated materials show high electrocatalytic performance for hydrogen evolution reaction (HER) with activities of onset potential at 89 mV, which is almost identical to that of platinum. The chemical and electronic properties of materials are successfully optimized in Ni/Gd2O3/NiO coaxial heterostructures; the NiO NF with Gd 3+ enhances remarkably its electrical conductivity and promotes HER reaction kinetics. It offers the distinct advantages of long-term durability and readiness for the integration into producing hydrogen via HER, affording better performance than benchmark Pt catalysts. The 2 successful fabrication of these metal oxides nanofibers and nanostructures may pave a new path for rational synthesis of efficient HER catalysts.

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Section: Resultssupporting

confidence: 59%

Coaxial nanofibers of nickel/gadolinium oxide/nickel oxide as highly effective electrocatalysts for hydrogen evolution reaction

El-Maghrabi

Nada

Bekheet

et al. 2021

Journal of Colloid and Interface Science

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“…64 The relative shift in the position of the main adsorption edge, which is attributed to 1s → 3p transitions, gives information about the average oxidation state of transition elements because of the high sensitivity of outer porbitals to chemical changes. 65,66 The K-edge position for pure and doped La 2 NiO 4 samples locates between those of NiO and LaNiO 3 standards, indicating the presence of both Ni 2+ and Ni 3+ cations in all La 2 NiO 4 samples. These results can be explained by the accommodation of excess oxygen in the S11).…”

Section: Resultsmentioning

confidence: 89%

Steering the Methane Dry Reforming Reactivity of Ni/La₂O₃ Catalysts by Controlled In Situ Decomposition of Doped La₂NiO₄ Precursor Structures

et al. 2020

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The influence of A-and/or B-site doping of Ruddlesden−Popper perovskite materials on the crystal structure, stability, and dry reforming of methane (DRM) reactivity of specific A 2 BO 4 phases (A = La, Ba; B = Cu, Ni) has been evaluated by a combination of catalytic experiments, in situ X-ray diffraction, X-ray absorption spectroscopy (XAS), X-ray photoelectron spectroscopy (XPS), and aberration-corrected electron microscopy. At room temperature, B-site doping of La 2 NiO 4 with Cu stabilizes the orthorhombic structure (Fmmm) of the perovskite, while A-site doping with Ba yields a tetragonal space group (I4/mmm). We observed the orthorhombic-to-tetragonal transformation above 170 °C for La 2 Ni 0.9 Cu 0.1 O 4 and La 2 Ni 0.8 Cu 0.2 O 4 , slightly higher than for undoped La 2 NiO 4 . Loss of oxygen in interstitial sites of the tetragonal structure causes further structure transformations for all samples before decomposition in the temperature range of 400 °C−600 °C. Controlled in situ decomposition of the parent or A/B-site doped perovskite structures in a DRM mixture (CH 4 :CO 2 = 1:1) in all cases yields an active phase consisting of exsolved nanocrystalline metallic Ni particles in contact with hexagonal La 2 O 3 and a mixture of (oxy)carbonate phases (hexagonal and monoclinic La 2 O 2 CO 3 , BaCO 3 ). Differences in the catalytic activity evolve because of (i) the in situ formation of Ni−Cu alloy phases (in a composition of >7:1 = Ni:Cu) for

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Ultrafast All‐Solid‐State Coaxial Asymmetric Fiber Supercapacitors with a High Volumetric Energy Density

Pan

Zhong

Zhang

et al. 2018

Advanced Energy Materials

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Fiber‐supercapacitors (FSCs) are promising energy storage devices that can complement or even replace microbatteries in miniaturized portable and wearable electronics. Currently, a major challenge for FSCs is achieving ultrahigh volumetric energy and power densities simultaneously, especially when the charge/discharge rates exceed 1 V s−1. Herein, an Au‐nanoparticle‐doped‐MnOx@CoNi‐alloy@carbon‐nanotube (Au–MnOx@CoNi@CNT) core/shell nanocomposite fiber electrode is designed, aiming to boost its charge/discharge rate by taking advantage of the superconductive CoNi alloy network and the greatly enhanced conductivity of the Au doped MnOx active materials. An all‐solid‐state coaxial asymmetric FSC (CAFSC) prototype device made by wrapping this fiber with a holey graphene paper (HGP) exhibits excellent performance at rates up to 10 V s−1, which is the highest charge rate demonstrated so far for FSCs based on pseudocapacitive materials. Furthermore, our fully packaged CAFSC delivers a volumetric energy density of ≈15.1 mW h cm−3, while simultaneously maintaining a high power density of 7.28 W cm−3 as well as a long cycle life (90% retention after 10 000 cycles). This value is the highest among all reported FSCs, even better than that of a typical 4 V/500 µA h thin‐film lithium battery.

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Compressibility and structural stability of spinel-type MnIn2O4

Cited by 14 publications

References 51 publications

Coaxial nanofibers of nickel/gadolinium oxide/nickel oxide as highly effective electrocatalysts for hydrogen evolution reaction

Coaxial nanofibers of nickel/gadolinium oxide/nickel oxide as highly effective electrocatalysts for hydrogen evolution reaction

Steering the Methane Dry Reforming Reactivity of Ni/La₂O₃ Catalysts by Controlled In Situ Decomposition of Doped La₂NiO₄ Precursor Structures

Ultrafast All‐Solid‐State Coaxial Asymmetric Fiber Supercapacitors with a High Volumetric Energy Density

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Compressibility and structural stability of spinel-type MnIn2O4

Cited by 14 publications

References 51 publications

Coaxial nanofibers of nickel/gadolinium oxide/nickel oxide as highly effective electrocatalysts for hydrogen evolution reaction

Coaxial nanofibers of nickel/gadolinium oxide/nickel oxide as highly effective electrocatalysts for hydrogen evolution reaction

Steering the Methane Dry Reforming Reactivity of Ni/La2O3 Catalysts by Controlled In Situ Decomposition of Doped La2NiO4 Precursor Structures

Ultrafast All‐Solid‐State Coaxial Asymmetric Fiber Supercapacitors with a High Volumetric Energy Density

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Steering the Methane Dry Reforming Reactivity of Ni/La₂O₃ Catalysts by Controlled In Situ Decomposition of Doped La₂NiO₄ Precursor Structures