JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY
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2018
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IF 4.841
Jiahong Zhu,Yingjie Xu,Xiao Feng,Xiao Zhu
To get a better understanding of the effect of physicochemical properties and microstructure on SO 2 absorption behavior of DESs with different molar ratios of EmimCl and EG (from 2:1 to 1:2), densities ( ρ ), viscosities ( η ), speeds of sound ( u ), refractive indices ( n D ), and thermal decomposition temperatures ( T d ) of EmimCl-EG DESs were measured and used to obtain the other derived properties, such as thermal expansion coefficient ( α p ) and activation energy for viscous flow ( E η ). Moreover, FT-IR spectra and in situ variable-temperature NMR spectroscopy were employed to study the microstructures of DESs. Based on physicochemical and spectroscopic properties, the influence of the concentrations of EmimCl on the interactions in DESs was explored to be associated with their SO 2 absorption behavior. The results show that the interactions between Emim + and Cl − of EmimCl is gradually weakening with increasing the concentration of EG in DESs by forming of hydrogen bond interaction of O H⋯Cl − , resulting in a decrease of ρ , η , u , n D , and T d of DESs, and hindering the charge–transfer interaction of SO 2 with Cl − and deceasing SO 2 capture capacity. Moreover, the SO 2 absorption capacity of DESs is proportional to their ρ and E η , respectively.
研究领域:
化学
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环境科学
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DOI
高影响因子
ChemistrySelect
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2023
·Vol. 8
·期 39
·e202301413
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IF 2.1
Tingting Chen,Yingjie Xu
Graphical A strategy to improve CO 2 capture of AmimCl-TEG DESs is proposed, that is addition of equimolar DBU to DESs, then H-bonds between DBU and O−H of TEG cause TEG to deprotonate to anion and react with CO 2 , and the CO 2 absorption capacity by DESs-DBU is up to 2.94 mol kg −1 and is 11 times that of pure DESs, and the interaction of DESs with CO 2 changes from physisorption to chemisorption. Microstructure of deep eutectic solvents (DESs) based on EmimCl or BmimCl ionic liquid (IL) and triethylene glycol (TEG) was studied by FT-IR spectra. The influence of 1,8-diazabicyclo[5.4.0]undec-7-ene (DBU) on CO 2 absorption behavior and mechanism of DESs was investigated. FT-IR spectra of pure EmimCl-TEG and BmimCl-TEG DESs show that O−H⋅⋅⋅Cl − hydrogen bond interaction formed by IL and TEG gradually strengths with the increase in the molar ratio of IL to TEG, resulting in a corresponding increase in viscosity. Due to the lack of a chemical interaction site, the CO 2 absorption capacity of pure DESs at 313.2 K and 1.0 bar is only between 0.15 and 0.56 mol kg −1 . Surprisingly, the addition of equimolar DBU to DESs can significantly improve the CO 2 absorption capacity, which is up to 2.94 mol kg −1 at the maximum and similar to that of amine-functionalized DESs. CO 2 absorption mechanism characterized by FT-IR spectra indicates that DBU can form hydrogen bond with O−H of TEG, which leads to deprotonation of O−H of TEG into basic anion under the synergistic effect of O−H⋅⋅⋅Cl − hydrogen bond to achieve efficient CO 2 chemisorption via carbonate formation. The obtained results provide a strategy for effectively improving the CO 2 capture capacity of EmimCl-TEG and BmimCl-TEG DESs.
研究领域:
化学工程
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环境科学
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DOI
高影响因子
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
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2025
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IF 4.1
Guiyang Li,Jinxia Wang,Hongwei Xie,Bo Tao,Zhenyu Li,Kai Yu,Qiushi Song,Zhiqiang Ning
Conquering the anodic passivation effects is essential to achieve the validity of the electrorefining process in room temperature ionic liquids. Herein, we investigated the effect mechanism of H 2 O on the removal of AlCl 3 (s) passivation layer on the surface of aluminum anode and the deposition of aluminum foil on the cathode in EmimCl-AlCl 3 ionic liquid. The results indicate that the introduced H 2 O derives an intermediate species AlCl 3 OH − , which is the key to de-passivation. The de-passivation effect of AlCl 3 OH − is divided into three stages with the anodic potential increase: under the low anodic potential of 0.8 V, it derives the black passivation film AlCl 2 OH(s), and consumes the AlCl 3 (s) passivation layer derived by Al 2 Cl 7 − → AlCl 4 − + AlCl 3 (s) at the anodic potential of 1.6 V ~ 2.2 V. Moreover, the derived AlCl 2 OH(s) is simultaneously also consumed up by the reaction AlCl 2 OH(s) + AlCl 4 − → Al 2 Cl 6 OH − . At the higher anodic potential of 2.2 V, it consumes up the derived AlCl 3 passivation layer, which ensures the continuous dissolution of the aluminum anode, resulting in the high anode dissolution current efficiency of about 100 %. On the other hand, the aluminum foil is electrodeposited by the electrochemical reduction of 4Al 2 Cl 7 − and Al 2 Cl 6 OH − species. However, the introduction of H 2 O reduces the current efficiency of the aluminum foil electrodeposition from 97 % to 90 % as the anodic potential increases from 1.6 V to 3.0 V. In addition, the lithium cobaltate half-cell with the electrodeposited aluminum foil collector shows a superior capacity retention rate of 98.33 % for 150 cycles at 0.5C current density.
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DOI
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
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2020
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IF 3.573
Jintian Wu,Gaojing Xia,Shangbo Li,Lupei Wang,Jianjun Ma
Ionogels combine the virtues of polymers and ionic liquids (ILs) and have greater potential for supercapacitors (SCs) than hydrogels and organic gels. Undoubtedly, the self-healing ability of ionogels dramatically improves the reliability of related SCs. Herein, we reported a dynamic diol-borate ester-cross-linked polyvinyl alcohol (PVA) ionogel electrolyte for smart double-layer capacitors. The results indicated that 1-ethyl-3-methylimidazolium chloride (EmimCl) could form a strong interaction with the hydroxy groups on PVA, thereby depressing the crystallization efficiently. The resultant ionogel exhibited an amorphous nature with excellent ionic conductivity up to 2.43 × 10–3 S/cm, high flexibility, and 95% healing efficiency when the IL content was 90 vol %. It could be inferred from the fact that EmimCl acted not only as an ion provider to improve the ionic conductivity but also as a plasticizer to enhance the chain mobility and self-healing efficiency. Based on the unique properties of PVA-boric acid/EmimCl ionogels, a flexible and self-healable SC was assembled. The as-prepared SC delivered a specific capacitance of 90 F/g at 0.1 A/g and retained 98% capacitance after 3000 charge–discharge cycles at a current density of 2 A/g. More interestingly, it could tolerate physical bending and healing without significant performance deterioration. The present study provides a novel strategy to prepare self-healable ionogel electrolytes that can be applied to smart energy storage devices.
研究领域:
材料科学
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电化学
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能源存储
·
高分子科学
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DOI
高影响因子
危险品化学品经营许可证（带存储）