Controllable optical transitions of amorphous Mg and Mg–Ni films via electrochemical methods

Literature Information

Publication Date 2015-04-10
DOI 10.1039/C5CP00800J
Impact Factor 3.676
Authors

Jiameng Qiu, Feilong Wu, Xin Jin, Xinyuan Gu, Wenbin Cai, Dalin Sun, Fang Fang


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Abstract

Amorphous Mg and MgNix (0.03 ≤ x ≤ 0.30) thin films capped with Pd were prepared by magnetron co-sputtering, and their hydrogen-induced optical transitions were investigated via electrochemical charging and discharging in KOH electrolyte solution. Repetitive transitions, up to dozens of times between the mirror state and transparent state, are achieved in these amorphous Mg and MgNix thin films even though some performance degeneration occurs during cycling. These deteriorations are mainly attributed to the breakdown of the film structure, which is caused by both a large change in film volume during cycling and the corrosive attack of the KOH electrolyte. In addition, calculations based on the electrochemical stripping method indicate that the hydrogen diffusion coefficient is significantly increased by amorphization; however, it is only slightly improved by the addition of Ni. Among the prepared amorphous films, MgNi0.09 film shows the largest hydrogen diffusion coefficient, namely, 2.64 × 10−13 cm2 s−1. More importantly, the optical properties of the amorphous Mg and MgNix films are readily manipulated in the charging process, especially under a small charging current density, where there is a linear correlation between charging capacity and transmittance. The tunable optical properties obtained in the present study will greatly expand the application fields of Mg-based thin films.

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Physical Chemistry Chemical Physics

Physical Chemistry Chemical Physics
CiteScore: 5.5
Self-citation Rate: 10.3%
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Physical Chemistry Chemical Physics (PCCP) is an international journal co-owned by 19 physical chemistry and physics societies from around the world. This journal publishes original, cutting-edge research in physical chemistry, chemical physics and biophysical chemistry. To be suitable for publication in PCCP, articles must include significant innovation and/or insight into physical chemistry; this is the most important criterion that reviewers and Editors will judge against when evaluating submissions. The journal has a broad scope and welcomes contributions spanning experiment, theory, computation and data science. Topical coverage includes spectroscopy, dynamics, kinetics, statistical mechanics, thermodynamics, electrochemistry, catalysis, surface science, quantum mechanics, quantum computing and machine learning. Interdisciplinary research areas such as polymers and soft matter, materials, nanoscience, energy, surfaces/interfaces, and biophysical chemistry are welcomed if they demonstrate significant innovation and/or insight into physical chemistry. Joined experimental/theoretical studies are particularly appreciated when complementary and based on up-to-date approaches.

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