Improving the phase stability and cycling performance of Ce<sub>2</sub>Ni<sub>7</sub>-type RE–Mg–Ni alloy electrodes by high electronegativity element substitution

Gao, Zhijie; Yang, Zhongnian; Li, Yongtao; Deng, Anqiang; Luo, Yan‐Ling; Li, Haiwen

doi:10.1039/c8dt03644f

Cited by 23 publications

(7 citation statements)

References 43 publications

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“…Apparently, the higher electronegativity signifies the lower chemical activity, all of which connote a higher oxidation resistance. 36 Thus, the following trend of chemical reactivity of the species is predicted herein: α-pinene > sabinene > limonene > βpinene > camphene. The stated reactivity sequence accords well with the arrangement of the energy gap between LUMO Δ g and HOMO of monoterpene species in Figure 3, i.e., the smaller the energy gap, the higher the reactivity.…”

Section: Resultsmentioning

confidence: 65%

“…Camphene remains the hardest reagent with the highest electronegativity and the lowest chemical potential. Apparently, the higher electronegativity signifies the lower chemical activity, all of which connote a higher oxidation resistance . Thus, the following trend of chemical reactivity of the species is predicted herein: α-pinene > sabinene > limonene > β-pinene > camphene.…”

Section: Resultsmentioning

confidence: 67%

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Probing the Reactivity of Singlet Oxygen with Cyclic Monoterpenes

et al. 2019

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Monoterpenes represent a class of hydrocarbons consisting of two isoprene units. Like many other terpenes, monoterpenes emerge mainly from vegetation, indicating their significance in both atmospheric chemistry and pharmaceutical and food industries. The atmospheric recycling of monoterpenes constitutes a major source of secondary organic aerosols. Therefore, this contribution focuses on the mechanism and kinetics of atmospheric oxidation of five dominant monoterpenes (i.e., limonene, α-pinene, β-pinene, sabinene, and camphene) by singlet oxygen. The reactions are initiated via the ene-type addition of singlet oxygen (O 2 1 Δ g ) to the electron-rich double bond, progressing favorably through the concerted reaction mechanisms. The physical analyses of the frontier molecular orbitals agree well with the thermodynamic properties of the selected reagents, and the computed reaction rate parameters. The reactivity of monoterpenes with O 2 1 Δ g follows the order of α-pinene > sabinene > limonene > β-pinene > camphene, i.e., α-pinene and camphene retain the highest and lowest reactivity toward singlet oxygen, with rate expressions of k ( T ) (M –1 s –1 ) = 1.13 × 10 8 exp(−48(kJ)/ RT (K)) and 6.93 × 10 8 exp(−139(kJ)/ RT (K)), respectively. The effect of solvent on the primary reaction pathways triggers a slight reduction in energy, ranging between 12 and 34 kJ/mol.

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Section: Resultsmentioning

confidence: 65%

Section: Resultsmentioning

confidence: 67%

Probing the Reactivity of Singlet Oxygen with Cyclic Monoterpenes

et al. 2019

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“…Due to high power density, energy density, and fast chargingdischarging capability, super capacitors are very useful in hybrid electrical vehicles, power electronics, and many other applications. [6,7] A common process for enhancing dielectric constant of polymers to make them useful in super capacitors and other high energy storage devices is the loading of high dielectric ceramic fillers.…”

Section: Introductionmentioning

confidence: 99%

Dielectric Response of Bi₄Ti₃O₁₂/PVDF Composite Electrodes for Energy Storage

Yadav,

Singh

et al. 2024

Macromolecular Symposia

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This study is reporting the role of embedded ferroelectric ceramics Bi4Ti3O12 (BTO = 1–5 wt%) into the polyvinylidene fluoride (PVDF) composites on its structural, bonding, surface morphology, and dielectric response. Especially lead free flexible composite electrodes have lot of attention due to its high dielectric permittivity and energy storage density. X‐ray diffraction spectra confirms monophasic orthorhombic structure of composites, while Fourier transform infrared (FTIR) spectra confirms the bonding behavior. Scanning electron microscopy (SEM) images surface morphology of homogeneously distributed ceramic particles with interconnected network. Dielectric constant has been found to be improved from 9.56 to 13.73 for BTO5%PVDF95% composites at frequency of 1 kHz attributes promoted interfacial polarization of PVDF and effectively limited the charge leakage in the composites, implying promising applications in flexible electronic devices.

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“…AB 2 -type alloys are considered as the secondary generation anode materials with the higher discharge capacity, whereas the hydrogen-induced amorphization (HIA) issue leads to the poor cycling stability; furthermore, they exhibit poor activation property. 12 Recently, Rare Earth (RE)-Mg-Ni-based alloys with superlattice structures have garnered tremendous attention because of the higher discharge capacity of ∼400 mAh g -1 , 13,14 superior cycling performance and good HRD performance, which is deemed as the thirdgeneration materials for high-energy and high-power Ni/MH batteries. 13 The RE-Mg-Ni-based alloys can be described as AB y types, 11 where the AB y (2 < y < 5) superlattice structures commonly contain AB 3 −, A 2 B 7 −, and A 5 B 19 −type phases according to the stacking ratios of [AB 5 ] and [A 2 B 4 ] subunits along the c axis of 1:1, 2:1 and 3:1, respectively.…”

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confidence: 99%

Phase Transformation and Electrochemical Feature of an AB₄-Type La_0.60Sm_0.20Mg_0.20Ni_3.50Al_0.20 Hydrogen Storage Alloy for Ni/MH Batteries

Guo

Wang

et al. 2023

J. Electrochem. Soc.

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La–Mg–Ni-based alloys with a novel AB4-type superlattice structure is supposed as potential anode materials for nickel metal hydride (Ni/MH) batteries due to the excellent discharge ability at high rates and long cycling life. However, it is still challenging to achieve high phase content of the AB4-type structure during annealing due to the complex peritectic reaction of virous superlattice structures. Herein, we study the phase transformation of the AB4-type structure upon annealing and elucidate its effect on electrochemical characteristics based on a La0.60Sm0.20Mg0.20Ni3.60Al0.20 alloy. It is found that the AB4-type phase forms between 970℃–1000℃ by a peritectic reaction of Pr5Co19- and CaCu5-type phases. The existence of AB4-type phase drives the alloy a higher discharge capacity of 366 mAh g–1 at 60 mA g–1, and 135 mAh g–1 at 1800 mA g–1 owing to the advantages of charge transfer and hydrogen diffusion. Moreover, high capacity retentions of 88.7% and 79.3% at the 100th and 200th cycles are respectively achieved. Besides, the alloy with AB4-type phase shows improved tolerance at a low temperature of –40℃. We expect that our finding can provide guidance for developing AB4-type hydrogen storage alloy for Ni/MH.

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Improving the phase stability and cycling performance of Ce₂Ni₇-type RE–Mg–Ni alloy electrodes by high electronegativity element substitution

Abstract: In this work, La0.83−xYxMg0.17Ni3.1Co0.3Al0.1 (x = 0.0–0.6) alloys with a high capacity and long cycling lifetime are designed and characterized by combining the theoretical framework of the electronegativity of rare earth elements and anti-oxidation ability analysis.

Cited by 23 publications

References 43 publications

Probing the Reactivity of Singlet Oxygen with Cyclic Monoterpenes

Probing the Reactivity of Singlet Oxygen with Cyclic Monoterpenes

Dielectric Response of Bi₄Ti₃O₁₂/PVDF Composite Electrodes for Energy Storage

Phase Transformation and Electrochemical Feature of an AB₄-Type La_0.60Sm_0.20Mg_0.20Ni_3.50Al_0.20 Hydrogen Storage Alloy for Ni/MH Batteries

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Improving the phase stability and cycling performance of Ce2Ni7-type RE–Mg–Ni alloy electrodes by high electronegativity element substitution

Abstract: In this work, La0.83−xYxMg0.17Ni3.1Co0.3Al0.1 (x = 0.0–0.6) alloys with a high capacity and long cycling lifetime are designed and characterized by combining the theoretical framework of the electronegativity of rare earth elements and anti-oxidation ability analysis.

Cited by 23 publications

References 43 publications

Probing the Reactivity of Singlet Oxygen with Cyclic Monoterpenes

Probing the Reactivity of Singlet Oxygen with Cyclic Monoterpenes

Dielectric Response of Bi4Ti3O12/PVDF Composite Electrodes for Energy Storage

Phase Transformation and Electrochemical Feature of an AB4-Type La0.60Sm0.20Mg0.20Ni3.50Al0.20 Hydrogen Storage Alloy for Ni/MH Batteries

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Improving the phase stability and cycling performance of Ce₂Ni₇-type RE–Mg–Ni alloy electrodes by high electronegativity element substitution

Dielectric Response of Bi₄Ti₃O₁₂/PVDF Composite Electrodes for Energy Storage

Phase Transformation and Electrochemical Feature of an AB₄-Type La_0.60Sm_0.20Mg_0.20Ni_3.50Al_0.20 Hydrogen Storage Alloy for Ni/MH Batteries