Two-dimensional (2D) Ti3C2T
X
MXene has been a promising
nanomaterial in energy storage,
electromagnetic shielding, and sensors. However, MXene suffers from
major drawbacks of unstable structure and vulnerable oxidation in
ambient moisture. Herein, a facile strategy is proposed to address
the challenging problems via oxygen-rich molecular
bridging. The tannic acid bridging agent with abundant O-containing
ligands can self-polymerize and bind at the terminal groups and exposed
Ti atom of Ti3C2T
X
by a synergistic hydrogen bond and coordination bond. The enhanced
interlaminar interaction endows the MXene film with resistance to
oxidation, swelling, and mechanical fragility. Density functional
theory calculations prove that the charge transfer from MXene to oxygen-rich
molecules improves the interface electronic structure, thus enlarging
the work function of pristine Ti3C2T
X
, which means increased resistance toward losing
electrons and being oxidized. The resultant bridged MXene film achieves
7 times toughness enhancement compared with pristine MXene, stable
conductivity during the long-term storage in a humid environment,
excellent structural and electrochemical stability during 10 000 cycles
in aqueous electrolytes, and a remarkable energy density of 53.3 mW
h cm–3 used for flexible symmetric micro-supercapacitors.
This work opens opportunities for the rational design and fabrication
of robust 2D MXene assemblies for aqueous energy storage.
Low-density polyethylene single-polymer composites (SPCs) reinforced with sandwiched ultrahigh-molecular-weight polyethylene woven fabric were prepared by insert injection molding. The process combines aesthetic and processing advantages. A processing temperature window (135–155°C) of a very short cycle time (less than 30 s) could be realized. The mechanical properties and morphologies of the samples were evaluated. The results suggested that the polyethylene SPCs were prepared successfully with concurrent increases in flexural strength (∼57%), tensile strength (∼164%), and impact strength (∼69%). The effects of different processing parameters including the nozzle temperature, injection pressure, injection speed, and the holding time were discussed. Numerical simulation results were used in the analysis.
Seven novel aluminium complexes supported by Schiff base ligands derived from o‐diaminobenzene or o‐aminothiophenol were synthesized and characterized. The reactions of AlMe3 with L1 (N,N′‐bis(benzylidine)‐o‐phenylenediamine) and L2 (N,N′‐bis(2‐thienylmethylene)‐o‐phenylenediamine) gave the complexes L1AlMe3 (1) and L2AlMe2 (2), respectively, which involved two types of reaction mechanisms: one was proton transfer and ring closure, and the other was alkyl transfer. Complexes L3AlMe2 (HL3 = 4‐chlorobenzylidene‐o‐aminothiophenol) (3), L4AlMe2 (HL4 = 2‐thiophenecarboxaldehyde‐o‐aminothiophenol) (4), L3AlH(NMe3) (5), L4AlH(NMe3) (6) and L5AlH(NMe3) (HL5 = 4‐methylbenzylidene‐o‐aminothiophenol) (7) were prepared by reacting HL3–5 with equimolar AlMe3 or H3Al⋅NMe3, respectively. Compounds 3–7 feature an organic–inorganic hybrid containing CNAlSC five‐membered ring. All complexes were characterized using 1H NMR and 13C NMR spectroscopy, X‐ray crystal structure analysis and elemental analysis. The efficient catalytic performances of 1–7 for the hydroboration of carbonyl groups were investigated, with compound 4 exhibiting the highest catalytic activity among all the complexes.
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