In recent years, organic-inorganic metal halide (OIH) perovskites have become a popular material of increasing interest. Due to the presence of organic cations, OIH perovskites suffer from chemical instability and...
Based
on the urgent demand of non-flammable electrospun nanofiber
separators and the strong adsorption to polysulfides through chemical
doping in separators for Li–S cell, in this study, a phosphorus,
nitrogen, and sulfur three-flame retardant (di-(2-(5,5-dimethyl-2-sulfido-1,3,2-dioxaphosphinan-2-yl)hydrazineyl)-P-ethylphosphinic) was synthesized and a high-performance
flame-retarding poly-m-phenyleneisophthalamide (PMIA)
membrane was successfully prepared through blend electrospinning with
the flame retardant, it is regarded as a promising gel nanofiber membrane
with advanced safety for the lithium–sulfur (Li–S) cell,
and it was systematically explored and analyzed. It was presented
that the modified PMIA electrospun membrane with the synthesized flame
retardant possessed excellent flame retardation, outstanding thermal
stability, and good mechanical strength. Meanwhile, the prepared membrane
showed extraordinarily high uptake and preserving retention of the
liquid electrolyte and enhanced ionic conductivity. More importantly,
the assembled Li–S cells using the obtained membrane exhibited
excellent cycling retention and outstanding rate capability because
of its fast ion transportation and good interfacial compatibility.
The assembled batteries with the novel membrane exhibited a high first-cycle
discharge capacity of 1121.50 mA h g–1, superior
discharge capacity retention of 713.41 mA h g–1,
and high Coulombic efficiency of 98.46% after 600 cycles at the 0.5
C rate. In addition, the limiting oxygen index of the obtained nanofiber
membrane with flame retardancy was as high as ∼30.0%, which
could greatly enhance the safety of the electrospun nanofiber separator.
The excellent electrochemical performances and safety for the battery
assembled with the prepared gel PMIA nanofiber membrane were attributed
to the significantly prevented “shuttle effect” of lithium
polysulfides based on the physical capturing of lithium polysulfides
through the obtained jelly-like gel state and chemical binding of
polysulfide intermediates through the tridoped phosphorus, nitrogen,
and sulfur elements in the PMIA and the flame retardant. All of these
excellent properties will promote the great development of the Li–S
battery with high performance and satisfactory safety.
Gas sensors play an irreplaceable role in industry and life. Different types of gas sensors, including metal-oxide sensors, are developed for different scenarios. Titanium dioxide is widely used in dyes, photocatalysis, and other fields by virtue of its nontoxic and nonhazardous properties, and excellent performance. Additionally, researchers are continuously exploring applications in other fields, such as gas sensors and batteries. The preparation methods include deposition, magnetron sputtering, and electrostatic spinning. As researchers continue to study sensors with the help of modern computers, microcosm simulations have been implemented, opening up new possibilities for research. The combination of simulation and calculation will help us to better grasp the reaction mechanisms, improve the design of gas sensor materials, and better respond to different gas environments. In this paper, the experimental and computational aspects of are reviewed, and the future research directions are described.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.