Abstract
Combination of two-dimensional (2D) materials and semiconductors is considered to be an effective way for fabricating photocatalysts for solving the environmental pollution and energy crisis. In this work, novel 2D/2D heterojunction of R-scheme Ti3C2 MXene/MoS2 nanosheets is successfully synthesized by hydrothermal reaction. The photocatalytic activity of the Ti3C2 MXene/MoS2 composites is evaluated by photocatalytic degradation and hydrogen evolution reaction. Especially, 0.5 wt% Ti3C2 MXene/MoS2 sample exhibits optimum methyl orange (MO) degradation and H2 evolution rate of 97.4% and H2 evolution rate of 380.2 μmol h−1 g−1, respectively, which is attributed to the enhanced optical absorption ability and increased specific surface area. Additionally, Ti3C2 MXene coupled with MoS2 nanosheets is favorable for improving the photocurrent response and reducing the electrochemical impedance, leading to the enhanced electron transfer of excited semiconductor and inhibition of charge recombination. This work demonstrates that Ti3C2 MXene could be a promising carrier to construct 2D/2D heterojunction in photocatalytic degradation and hydrogen evolution reaction.
Highlights
Over the past few years, the Industrial Science and Technology is developing significantly, whereas the environmental problems and energy crisis have become much more serious [1,2,3,4]
Excessive Ti3C2 reduces the photocatalytic performance of the Ti3C2 MXene/MoS2 (TM) samples, which is ascribed to the fact that excessive Ti3C2 addition prevents the light absorption of MoS2 nanosheets [50]
2D/2D heterojunction of R-scheme Ti3C2 MXene/MoS2 composites is successfully synthesized by hydrothermal method
Summary
Over the past few years, the Industrial Science and Technology is developing significantly, whereas the environmental problems and energy crisis have become much more serious [1,2,3,4]. Photocatalytic activities of Ti3C2 MXene/MoS2 composites are evaluated by photocatalytic degradation of MO and hydrogen evolution reaction (HER) under visible light irradiation. Photocatalytic performance reflects that MoS2 coupled with Ti3C2 MXene presents higher degradation ability and H2 production rate than pure MoS2 under the same condition.
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