Electrochemical characteristics of La–Ni–Al thin films

Li, Chi-Ying Vanessa; Wang, Zhong Min; Liu, Shi; Chan, S.L.I.

doi:10.1016/j.jallcom.2007.02.058

Cited by 9 publications

(5 citation statements)

References 16 publications

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“…Focused ion beam (FIB) techniques have previously been reported for obtaining cross sections of battery electrodes for further examination. − Cross-sectional samples are excised using an FIB milling technique, whereby trenches are ion-milled normal to the electrode surface to produce a thin lamella. The lamella is then cut free and lifted out from the bulk sample using a tungsten manipulator welded to the free part of the sample. , Notably, the samples are cut normal to the plane of the electrode and typically have dimensions of 20–40 μm.…”

Section: Introductionmentioning

confidence: 99%

2D Cross Sectional Analysis and Associated Electrochemistry of Composite Electrodes Containing Dispersed Agglomerates of Nanocrystalline Magnetite, Fe₃O₄

Bock

Kirshenbaum

Wang

et al. 2015

ACS Appl. Mater. Interfaces

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When electroactive nanomaterials are fully incorporated into an electrode structure, characterization of the crystallite sizes, agglomerate sizes, and dispersion of the electroactive materials can lend insight into the complex electrochemistry associated with composite electrodes. In this study, composite magnetite electrodes were sectioned using ultramicrotome techniques, which facilitated the direct observation of crystallites and agglomerates of magnetite (Fe3O4) as well as their dispersal patterns in large representative sections of electrode, via 2D cross sectional analysis by Transmission Electron Microscopy (TEM). Further, the electrochemistry of these electrodes were recorded, and Transmission X-ray Microscopy (TXM) was used to determine the distribution of oxidation states of the reduced magnetite. Unexpectedly, while two crystallite sizes of magnetite were employed in the production of the composite electrodes, the magnetite agglomerate sizes and degrees of dispersion in the two composite electrodes were similar to each other. This observation illustrates the necessity for careful characterization of composite electrodes, in order to understand the effects of crystallite size, agglomerate size, and level of dispersion on electrochemistry.

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Section: Introductionmentioning

confidence: 99%

2D Cross Sectional Analysis and Associated Electrochemistry of Composite Electrodes Containing Dispersed Agglomerates of Nanocrystalline Magnetite, Fe₃O₄

Bock

Kirshenbaum

Wang

et al. 2015

ACS Appl. Mater. Interfaces

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“…The hydrogen uptake/release in the alloy causes both expansion and shrinkage of the lattice while this mechanical stress may lead to a peristaltic transport of lanthanum to the surface [45]. As a result, the capacity of the electrode also undergoes a slight variation with cycling which is common for metal hydrides [32,46,43,42]. When we compare the cycling characteristics of the present thin-film electrode to those of Wang et al [32,46], there are some noticeable differences.…”

Section: Electrochemical Characterizationmentioning

confidence: 84%

“…Higher deposition rate at increased pressure can result in a denser film which has significant volume expansion during pulverization [46]. As a result, the mechanical stability of the so-fabricated film may decrease.…”

Section: Electrochemical Characterizationmentioning

confidence: 99%

Electrochemical investigation and modelling of LaNi4.77Al0.23 thin-films sputtered on glass wafers

Khazaeli

Falahati

Barz

2019

Journal of Alloys and Compounds

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In the present work, we report on the microfabrication of metal hydride thin-film electrodes which can be utilized for rechargeable microbatteries or sensor applications. A multi-layer deposition technique is developed based on physical vapor deposition to fabricate the thin-film electrodes on a glass substrate. The morphology and the structure of the thin-film electrodes are studied by using Field Emission Scanning Electron Microscopy coupled with an Energy Dispersive Spectroscopy module. The surface composition of the thin-film electrodes are determined using X-ray Photoelectron Spectroscopy. Cyclic Voltammetry and galvanostatic charge-discharge measurements are performed to obtain insights into the electrochemical performance of the electrodes. Finally, a semi-empirical model is derived which allows for the determination of the equilibrium potential of the electrode as a function of its hydrogen content.

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“…Many researchers have made numerous attempts to tackle the problems by enhancing the heat transfer of the reaction process, [6][7][8] adding other elements or materials [9][10][11][12] and changing the microstructure of the hydrides. [13][14][15] With high hydrogen content and low price, Mg and Mg based alloys are deemed to be one of the most promising hydrogen storage materials. Nevertheless, the problems of poor kinetics and thermodynamics also exist in this kind of hydrides.…”

Section: Introductionmentioning

confidence: 99%

Microstructure and improved hydrogen storage properties of Mg based alloy powders prepared by modified milling method

Wu¹,

Yang²,

Bao³

et al. 2013

Powder Metallurgy

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In this study, the modified preparation method of combining planetary and vibratory ball milling was proposed to prepare Mg based hydrogen storage alloy powders. The comparison of micromorphology and hydrogen storage behaviour between Mg2Ni prepared using the modified and conventional preparation methods were investigated experimentally. The comparison results showed that the combination of first planetary and then vibratory ball milling has more favourable effect on improving both the kinetics and the thermodynamics of ball milled Mg2Ni alloys. The sample synthesised by first planetary milling for 40 h and then vibratory milling for 30 h has faster hydrogen absorption kinetics and lower dehydriding onset temperature than those prepared by the single method of planetary or vibratory milling and hydriding combustion synthesis owing to its popcorn-like microstructure. Moreover, this kind of modified method reduces the reaction enthalpy and activation energy by up to ∼18 and 22% respectively.

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Electrochemical characteristics of La–Ni–Al thin films

Cited by 9 publications

References 16 publications

2D Cross Sectional Analysis and Associated Electrochemistry of Composite Electrodes Containing Dispersed Agglomerates of Nanocrystalline Magnetite, Fe₃O₄

2D Cross Sectional Analysis and Associated Electrochemistry of Composite Electrodes Containing Dispersed Agglomerates of Nanocrystalline Magnetite, Fe₃O₄

Electrochemical investigation and modelling of LaNi4.77Al0.23 thin-films sputtered on glass wafers

Microstructure and improved hydrogen storage properties of Mg based alloy powders prepared by modified milling method

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Electrochemical characteristics of La–Ni–Al thin films

Cited by 9 publications

References 16 publications

2D Cross Sectional Analysis and Associated Electrochemistry of Composite Electrodes Containing Dispersed Agglomerates of Nanocrystalline Magnetite, Fe3O4

2D Cross Sectional Analysis and Associated Electrochemistry of Composite Electrodes Containing Dispersed Agglomerates of Nanocrystalline Magnetite, Fe3O4

Electrochemical investigation and modelling of LaNi4.77Al0.23 thin-films sputtered on glass wafers

Microstructure and improved hydrogen storage properties of Mg based alloy powders prepared by modified milling method

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Product

Resources

About

2D Cross Sectional Analysis and Associated Electrochemistry of Composite Electrodes Containing Dispersed Agglomerates of Nanocrystalline Magnetite, Fe₃O₄

2D Cross Sectional Analysis and Associated Electrochemistry of Composite Electrodes Containing Dispersed Agglomerates of Nanocrystalline Magnetite, Fe₃O₄