2 research outputs found
Flower-like Heterogeneous Phosphorus-Doped Co<sub>3</sub>S<sub>4</sub>@Ni<sub>3</sub>S<sub>4</sub> Nanoparticles as a Binder-free Electrode for Asymmetric All-Solid-State Supercapacitors
Through the hydrothermal method and the gas-phase phosphating
method,
the flower-like heterogeneous phosphorus-doped Co3S4@Ni3S4 was synthesized in situ on a
nickel foam substrate as the binder-free electrode material for supercapacitors.
Phosphorus-doped Co3S4@Ni3S4 electrode material combines the merits of transition metal sulfides
and 3D porous network heterostructure, showing the excellent theoretical
specific capacitance and the high specific surface area. The introduction
of phosphorus atoms with an atomic radius larger than sulfur atoms
can optimize the internal electronic structure and cause structural
distortion. Therefore, the specific capacitance/specific capacity
of this electrode can reach 3614 F g–1 (451 mAh
g–1) at 1 A g–1 and still maintain
the initial specific capacitance of 73% after 3000 cycles. The assembled
P–Co3S4@Ni3S4-175//AC
ASC device exhibits an ultra-high energy density of 72 Wh kg–1 at a power density of 800 W kg–1. Meanwhile, it
can show extraordinary cyclic stability, with a retention rate of
91% after 5000 cycles. This work provides a feasible synthesis method
to prepare the composite electrode materials for supercapacitors
CO<sub>2</sub> Hydrogenation to Methanol over Catalysts Derived from Single Cationic Layer CuZnGa LDH Precursors
Ultrathin
(1–3 cationic-layers) (CuZn)<sub>1–<i>x</i></sub>Ga<sub><i>x</i></sub>-CO<sub>3</sub> layered
double hydroxide (LDH) nanosheets were synthesized following the aqueous
miscible organic solvent treatment (AMOST) method and applied as catalyst
precursors for methanol production from CO<sub>2</sub> hydrogenation.
It is found that, upon reduction, the aqueous miscible organic solvent
treated LDH (AMO-LDH) samples above a critical Ga<sup>3+</sup> composition
give consistently and significantly higher Cu surface areas and dispersions
than the catalysts prepared from conventional hydroxyl-carbonate phases.
Owing to the distinctive local steric and electrostatic stabilization
of the ultrathin LDH structure, the newly formed active CuÂ(Zn) metal
atoms can be stably embedded in the cationic layers, exerting an enhancement
to the catalytic reaction. The best catalyst in this study displayed
methanol productivity with a space-time yield of 0.6 g<sub>MeOH·</sub>g<sub>cat</sub><sup>–1</sup> h<sup>–1</sup> under typical
reaction conditions, which, as far as we are aware, is higher than
most reported Cu-based catalysts in the literature