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Strain engineering of electronic structures and photocatalytic responses of MXenes functionalized by oxygen

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Abstract

The structural, electronic, and photocatalytic properties of two-dimensional Ti2CO2, Zr2CO2, and Hf2CO2 MXenes were investigated by first-principles (PBE and hybrid) calculations. Transition from an indirect to a direct band gap was achieved for the biaxial tensile strain of 3% for Ti2CO2, 8% for Zr2CO2, and 13% for Hf2CO2 while the nature of the band gap remained indirect in the case of the compressive strain. The size of the band gap passed through a maximum under tensile strain and decreased monotonically under compressive strain. Analysis of Bader charge distribution showed that the tensile strain decreased the transfer of charge from the Ti, Zr, and Hf atoms to the C atom. Phonon spectra suggested that these systems are stable under a wide range of strains from compression to tension. The photocatalytic properties showed that unstrained and biaxial tensile strained Ti2CO2, Zr2CO2, and Hf2CO2 systems can be used to oxidize H2O into O2.

Graphical abstract: Strain engineering of electronic structures and photocatalytic responses of MXenes functionalized by oxygen

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Publication details

The article was received on 18 Apr 2017, accepted on 09 May 2017 and first published on 10 May 2017


Article type: Paper
DOI: 10.1039/C7CP02513K
Citation: Phys. Chem. Chem. Phys., 2017, Advance Article
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    Strain engineering of electronic structures and photocatalytic responses of MXenes functionalized by oxygen

    S. A. Khan, B. Amin, L. Gan and I. Ahmad, Phys. Chem. Chem. Phys., 2017, Advance Article , DOI: 10.1039/C7CP02513K

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