Strain engineering of electronic structures and photocatalytic responses of MXenes functionalized by oxygen
文献情報
S. A. Khan, B. Amin, Li-Yong Gan, Iftikhar Ahmad
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.
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Topics in Catalysis

Electroanalysis

Biocatalysis and Biotransformation

Journal of Chemical Sciences

Acta Metallurgica Sinica-English Letters

Journal of the Indian Institute of Science

Polycyclic Aromatic Compounds

Medicinal Chemistry Research

Chinese Journal of Chemistry

Critical Reviews in Solid State and Materials Sciences
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