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Issue 8, 2019
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Adsorption of metal atoms on silicene: stability and quantum capacitance of silicene-based electrode materials

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Abstract

We explore the adsorption stability and quantum capacitance of transition metal atoms on silicene based on first-principles calculations. Silicene with a buckled atomic layer has a high surface/volume ratio and silicene-based materials are expected to have potential applications for supercapacitors. We find that the most favorable adsorption sites on pristine silicene are valley sites for Al and Ti, and hollow sites for Ag, Cu and Au, respectively. Among all these systems with the doping of metal atoms, silicene is modulated to possess a quasi-metallic characteristic, accompanied by an appreciable electron transfer and the formation of defect states near the Fermi level. Due to the low density of states near the Fermi level, the quantum capacitance of pristine silicene has been limited. By the doping of metal atoms, especially Ti atoms, with the introduction of localized defect states near the Fermi level, quantum capacitance is found to be enhanced significantly. In addition, the quantum capacitance is found to increase monotonically following the increase of doping concentrations.

Graphical abstract: Adsorption of metal atoms on silicene: stability and quantum capacitance of silicene-based electrode materials

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Publication details

The article was received on 23 Sep 2018, accepted on 24 Jan 2019 and first published on 25 Jan 2019


Article type: Paper
DOI: 10.1039/C8CP05982A
Citation: Phys. Chem. Chem. Phys., 2019,21, 4276-4285

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    Adsorption of metal atoms on silicene: stability and quantum capacitance of silicene-based electrode materials

    Q. Xu, G. M. Yang, X. Fan and W. T. Zheng, Phys. Chem. Chem. Phys., 2019, 21, 4276
    DOI: 10.1039/C8CP05982A

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