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

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Date
2019-01-25
Authors
Khazaeli, Ali
Falahati, Hamid
Barz, Dominik P. J.
Keyword
(De)Hydrogenation model , Electrochemical characterization , Metal hydrides , Physical vapor deposition , Thin-film electrode
Abstract
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.