2 research outputs found
Borophene as Conductive Additive to Boost the Performance of MoS<sub>2</sub>‑Based Anode Materials
Carbon-based
materials, including graphene, porous carbon, and
nanotubes, have been widely used as conductive additives to reduce
the resistance in semiconductive anode materials of lithium-ion batteries
(LIBs) toward better performance and the alleviated battery overheat
problem. However, these additives are usually denounced for their
low lithium-ion capacity. Moreover, emergence of vacant defect and
heteroatom incorporation would open a sizable energy gap accompanied
by reduced conductance. Here, by selecting MoS<sub>2</sub> as a prototype
system, we proclaim the utilization of emerging borophene as the conductive
additive in terms of its low ion-transport barrier and robust metallic
conductivity against defects and external doping in addition to its
high Li-storage capacity. We found that substantial electrons transfer
from MoS<sub>2</sub> to borophene, producing strong electronic coupling
that conduces to favorable interface bonding in combination with improved
Li affinity. Incorporation of borophene also compensates the poor
mechanical property of MoS<sub>2</sub> with increased elastic modulus,
ensuring the electrode integrity against pulverization. Furthermore,
B/MoS<sub>2</sub> can achieve a maximum Li-storage capacity of 539
mAh/g along with low ion-hopping barriers inherited from its counterparts.
Our work brings new opportunities to boost the electrochemical performance
of semiconductive anode materials with borophene for LIBs
Experimental Studies of the Separation of C2 Compounds from CH<sub>4</sub> + C<sub>2</sub>H<sub>4</sub> + C<sub>2</sub>H<sub>6</sub> + N<sub>2</sub> Gas Mixtures by an Absorption–Hydration Hybrid Method
An absorption–hydration hybrid method was employed
for separating
C2 components (C<sub>2</sub>H<sub>4</sub> + C<sub>2</sub>H<sub>6</sub>) from low-boiling gas mixtures such as refinery dry gas using water-in-diesel
emulsions under hydrate formation conditions. Span 20 was used to
disperse the water or hydrate in diesel to form the emulsion or hydrate
slurry. To simulate a three-stage separation process, three (CH<sub>4</sub> + C<sub>2</sub>H<sub>4</sub> + C<sub>2</sub>H<sub>6</sub> + N<sub>2</sub>) feed gas mixture samples with different gas molar
compositions were prepared. Separation experiments were performed
under different conditions to investigate the influences of feed composition,
temperature, pressure, initial water cut in the emulsion, and initial
gas/liquid volume ratio on separation efficiency. The experimental
results show that the absorption–hydration hybrid method is
obviously superior to the single-absorption method. After three stages
of separation at appropriate operating conditions, we found that C2
compounds can be enriched from ∼15 to more than 50 mol % in
the (hydrate + diesel) slurry phase and that the content of C2 compounds
in the residual gas phase can be reduced to lower than 2 mol %. Low
temperature, low initial gas/liquid volume ratio, high pressure, and
high water cut were found to be favorable for the recovery of C2 compounds.
However, when the temperature was lower than 270.2 K and the water
cut was higher than 30 vol %, the formation of flowable hydrate slurry
became difficult