A synchronous strategy for improving the absorption/desorption to achieve highly efficient nitric oxide (NO) capture is proposed by the use of tetrakis(azolyl)borate ionic liquid (IL) [P66614][B(Im)4] with multiple nonconjugated interaction sites. This IL exhibited an ultrahigh absorption capacity up to 8.13 mol of NO per mol of IL, good desorption, and excellent reversibility. Through a combination of absorption experiments, DFT calculations, and FT-IR and NMR characterizations, the results indicate that the ultrahigh NO capacity by [P66614][B(Im)4] originated from multiple-sites chemisorption through the formation of diazeniumdiolates (NONOates), while uniform interaction of multiple nonconjugated sites was responsible for the unusual S-shaped absorption isobar, leading to good desorption and excellent reversibility, which was different from traditional ILs. We believe this work provides a new method for designing highly efficient gas absorbents.
The utilization of sulfide-based solid electrolytes represents an attractive avenue for high safety and energy density all-solid-state batteries. However, the potential has been impeded by electrochemical and mechanical stability at the interface of oxide cathodes. Plastic crystals, a class of organic materials exhibiting remarkable elasticity, chemical stability, and ionic conductivity, have previously been underutilized due to their susceptibility to dissolution in liquid electrolytes. Nevertheless, their application in all-solid-state batteries presents a paradigm that could potentially overcome longstanding interface-related obstacles. This study presents a facile approach to enhancing the performance of sulfide-based solid-state batteries by utilizing nickel-rich oxide cathodes coated with ionically conductive plastic crystals. For employing plastically deformed succinonitrile as a metal ion ligand, it simultaneously supports mechanical stability and interfacial conduction, while LiDFOB establishes moderate ionic conductivity and a stable cathode electrolyte interphase (CEI). The synergistic effects of these mechanisms culminate in remarkable long-term performance metrics, with the capacity retaining 80% after 1529 cycles. Furthermore, this stability is maintained even when the areal capacity density is increased to a substantial 3.53 mA h cm–2. By combining electrochemical stability with mechanical plasticity, this approach opens possibilities for the development of long-lasting solid-state batteries suitable for practical applications.
A B S T R A C TThe efficient adsorption of low-concentration sulfur dioxide (SO2) is challenging and critical for our society, but the weak interaction between traditional porous materials and gas molecules limits their practical applications. In this work, a series of functionalized ionic porous organic polymers (IPOPs) with high content of active sites are designed and applied for efficient and selective adsorption of low-concentration SO2. By facile ion exchange methods, IPOPs can be successfully functionalized and the influence on BET surface area is relatively small compared with other reported functionalization methods. Meanwhile, the adsorption capacity of SO2 on functionalized IPOPs improved greatly, where an ideal IPOPs TBM-BIm4 contributes a record high adsorption capacity (9.23 mmol g-1) under reduced pressure of 0.1 bar, high SO2/CO2 selectivity as well as excellent reversibility. Through a combination of experimental adsorption, DFT calculation and spectroscopic investigation, such a ultrahigh capacity originated from multi-site adsorption of the functionalized anion of TBM-BIm4. The present work demonstrates that it is an effective strategy to design IPOPs by introducing specific functionalized anions for excellent performance in low concentration of gas.
Despite a great deal of gas capture strategies based on ionic liquids, reversible tuning of gas absorption by pure ionic liquids using light irradiation has never been reported. Herein, we demonstrate a novel strategy for tuning the capture of CO2 by light-responsive ionic liquids through reversible trans–cis isomerization. These light-responsive ionic liquids were constructed by tailoring the azobenzene group to the cationic moiety, which exhibited different CO2 absorption ability before and after ultraviolet (UV) irradiation. Through a combination of absorption experiments, NMR spectroscopy, differential scanning calorimetry analysis, viscosity measurement, and quantum chemical calculations, the results indicated that the significant difference in CO2 absorption capacity originated from the entropic effect, which was induced by the change in the aggregation state during trans–cis isomerization. This reversible isomerization of ionic liquids upon alternating irradiation of UV light and blue light shows the potential to control the capture and release of CO2 in an energy-saving way.
Abstract Changes in the rheological properties of chitosan solutions with pH, ionic strength, and type of anion were studied. Between pH 2.0 and 5.0, apparent viscosities increased with the decrease of pH in chitosan–organic acid solutions, while in chitosan–HCl solutions they behaved oppositely. In chitosan–NaOH solutions, they decreased with the increase of pH between pH 5.0 and 6.0, then increased as pH further increased to pH 6.0–6.4. The difference may be due to different interactions of counterions with macroions and also the third electroviscous effect. Relative viscosity increased with a decrease in chitosan concentrations at concentrations below 1.5 × 10 −3 M. Intrinsic viscosities changed with media pH and ionic strength.
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