For
the first time, few-layer Ti3C2T
x
(FL-Ti3C2T
x
) supporting highly dispersed nano-Ni particles with
an interconnected and interlaced structure was elaborated through
a self-assembly reduction process. FL-Ti3C2T
x
not only acts as a supporting material but
also self-assembles with Ni2+ ions through the electrostatic
interaction, assisting in the reduction of nano-Ni. After ball milling
with MgH2, Ni30/FL-Ti3C2T
x
(few-layer Ti3C2T
x
supported 30 wt % nano-Ni via self-assembly
reduction) shows superior catalytic activity for MgH2.
For example, MgH2-5 wt % Ni30/FL-Ti3C2T
x
can release approximately
5.83 wt % hydrogen within 1800 s at 250 °C and absorb 5 wt %
hydrogen within 1700 s at 100 °C. The combined effects of finely
dispersed nano-Ni in situ-grown on FL-Ti3C2T
x
, large specific area of FL-Ti3C2T
x
, multiple-valence Ti
(Ti4+, Ti3+, Ti2+, and Ti0) derived from FL-Ti3C2T
x
, and the electronic interaction between Ni and FL-Ti3C2T
x
can explain the superb
hydrogen storage performance. Our results will attract more attention
to the elaboration of the metal/FL-Ti3C2T
x
composite via self-assembly reduction and
provide a guideline to design high-efficiency composite catalysts
with MXene in hydrogen storage fields.
In this work, Magnesium nanoparticles with Pd decoration, ranging from 40 to 70 nm, were successfully coprecipitated from tetrahydrofuran (THF) solution, assigned as the Mg-Pd nanocomposite. The Mg-Pd nanocomposite exhibits superior hydrogen storage properties. For the hydrogenated Mg-Pd nanocomposite at 150 • C, the onset dehydrogenation temperature is significantly reduced to 216.8 • C, with a lower apparent activation energy for dehydrogenation of 93.8 kJ/mol H 2 . High-content γ-MgH 2 formed during the hydrogenation process, along with PH 0.706 , contributes to the enhancing of desorption kinetics. The Mg-Pd nanocomposite can take up 3.0 wt% hydrogen in 2 h at a temperature as low as 50 • C. During lower hydrogenation temperatures, Pd can dissociate hydrogen and create a hydrogen diffusion pathway for the Mg nanoparticles, leading to the decrease of the hydrogenation apparent activation energy (44.3 kJ/mol H 2 ). In addition, the Mg-Pd alloy formed during the hydrogenation/dehydrogenation process can play an active role in the reversible metal hydride transformation, destabilizing the MgH 2 .
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