Abstract

Double traditional metal (TM) Janus MXenes have more superior properties when compared with MXenes. The electronic and optical properties, Bader charge and quantum capacitance of ZrMCO2 (M = Sc, Ti, V, Cr, Mn, Fe, Y, Zr, Nb, Mo, Hf, Ta, W) are explored by density functional theory (DFT). The stability of these systems is confirmed by cohesive energy. The substitution of Ti/Hf atoms results in the decrease of bandgap of ZrTiCO2/ZrHfCO2, which is induced by the redshift of conduction band minimum (CBM). ZrMCO2 (M = Cr, Mn) are magnetic semiconductors and ZrMCO2 (M = Sc, V, Y, Fe) are magnetic metals. All doping atoms except Hf improve the maximum quantum capacitance of ZrMCO2 at positive bias. Wide voltage makes ZrMCO2 (M = Nb, Ta, W) change into anode material and ZrFeCO2 into cathode material. ZrMCO2 (M = Sc, Mn, Y, Hf, Zr) and ZrMCO2 (M = V, Cr) can serve as cathode and anode materials in whole voltage, respectively. Much charge accumulating between Fe and C atoms results in the smallest Fe–C bond among all M − C bonds, which indicates the strongest interaction between Fe and C atoms. Optical properties and work function are further explored.

Full Text
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