AbstractMXene as a novel two-dimensional (2D) material exhibits a lot of advantages in nonlinear optics. However, the common MXene, Ti3C2Tx and Ti2CTx nanosheets, easily suffer from degradation under ambient conditions, greatly limiting their practical applications. Here, we demonstrated one of MXene compounds, V2CTx, which has a strong modulation depth (nearly 50%), can serve as an excellent saturable absorber (SA) in passively mode-locked (PML) fiber lasers. More importantly, 206th harmonic order has been successfully generated in Er-doped mode-locked fiber laser, exhibiting maximum repetition rate of 1.01 GHz and pulse duration of 940 fs, which to the best of our knowledge, is the highest harmonic mode-locked fiber laser from the MXene SA so far. In addition, the high harmonic order mode-locked operation can maintain at least 24 h without any noticeable change, suggesting MXene V2CTx nanosheets have excellent stability in this mode-locked fiber laser. It is anticipated that the present work can pave the way to new design for MXene-based heterostructures for high-performance harmonic mode-locked lasers.
As
we know, in plasmonic-enhanced heterogeneous catalysis, the
reaction rates could be remarkably accelerated by generating hot carriers
in the constituent nanostructured metals. To further improve the reaction
rate, well-defined heterostructures based on plasmonic gold nanoparticles
on MXene Ti3C2T
x
nanosheets (Au NPs@Ti3C2T
x
) were rationally designed and systematically investigated
to improve the performance of the oxygen evolution reaction (OER).
The results demonstrated that the catalysis performance of the Au
NPs@Ti3C2T
x
system
could be easily tuned by simply varying the concentration and size
of Au NPs, and Au NPs@Ti3C2T
x
with an average Au NP diameter (∼10 nm) exhibited a
2.5-fold increase in the oxidation or reduction current compared with
pure Ti3C2T
x
. The
enhanced OER performance can be attributed to the synergistic effect
of the plasmonic hot hole injection and Schottky junction carrier
trapping. Owing to easy fabrication of Au NPs@Ti3C2T
x
, the tunable size and concentration
of Au NPs loaded on MXene nanosheets, and the significantly enhanced
OER, it is expected that this work can lay the foundation to the design
of multidimensional MXene-based heterostructures for highly efficient
OER performance.
MXene‐based material has attracted wide attention due to its tunable band gap, high conductivity and impressive optical and plasmonic properties. Herein, a hetero‐nanostructured water splitting system was developed based on N‐doped Ti3C2 (N10TC) MXene and NiFe layered double hydroxide (LDH) nanosheets. The oxygen evolution reaction performance of the NiFe‐LDH significantly enhanced to approximately 8.8‐fold after incorporation of N10TC. Meanwhile, the Tafel slope was only 58.1 mV dec−1 with light irradiation, which is lower than pure NiFe‐LDH nanosheets (76.9 mV dec−1). All results manifested the vital role of the N10TC MXene induced plasmonic hot carriers via electrophoto‐excitation in enhancing the full water splitting performance of the as‐prepared system. This work is expected to provide a platform for designing various plasmonic MXenes‐based heterogeneous structures for highly efficient catalytic applications.
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