共查询到20条相似文献,搜索用时 9 毫秒
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《Angewandte Chemie (Weinheim an der Bergstrasse, Germany)》2017,129(47):15254-15258
Novel aqueous multiphase systems (MuPSs) formed by quaternary mixtures composed of cholinium‐based ionic liquids (ILs), polymers, inorganic salts, and water are reported herein. The influence of several ILs, polymers, and salts was studied, demonstrating that a triple salting‐out is a required phenomenon to prepare MuPSs. The respective phase diagrams and “tie‐surfaces” were determined, followed by the evaluation of the effect of temperature. Finally, the remarkable ability of IL‐based MuPSs to selectively separate mixtures of textile dyes is shown. 相似文献
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Fang Wan Zhiqiang Niu 《Angewandte Chemie (Weinheim an der Bergstrasse, Germany)》2019,131(46):16508-16517
Aqueous zinc‐ion batteries (ZIBs) are considered promising energy storage devices for large‐scale energy storage systems as a consequence of their safety benefits and low cost. In recent years, various vanadium‐based compounds have been widely developed to serve as the cathodes of aqueous ZIBs because of their low cost and high theoretical capacity. Furthermore, different energy storage mechanisms are observed in ZIBs based on vanadium‐based cathodes. In this Minireview, we present a comprehensive overview of the energy storage mechanisms and structural features of various vanadium‐based cathodes in ZIBs. Furthermore, we discuss strategies for improving the electrochemical performance of vanadium‐based cathodes; including, insertion of metal ions, adjustment of structural water, selection of conductive additives, and optimization of electrolytes. Finally, this Minireview offers insight into potential future directions in the design of innovative vanadium‐based electrode materials. 相似文献
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Kohei Miyamae Masaki Nakahata Yoshinori Takashima Akira Harada 《Angewandte Chemie (Weinheim an der Bergstrasse, Germany)》2015,127(31):9112-9115
Supramolecular materials cross‐linked between polymer chains by noncovalent bonds have the potential to provide dynamic functions that are not produced by covalently cross‐linked polymeric materials. We focused on the formation of supramolecular polymeric materials through host–guest interactions: a powerful method for the creation of nonconventional materials. We employed two different kinds of host–guest inclusion complexes of β‐cyclodextrin (βCD) with adamantane (Ad) and ferrocene (Fc) to bind polymers together to form a supramolecular hydrogel (βCD‐Ad‐Fc gel). The βCD‐Ad‐Fc gel showed self‐healing ability when damaged and responded to redox stimuli by expansion or contraction. Moreover, the βCD‐Ad‐Fc gel showed a redox‐responsive shape‐morphing effect. We thus succeeded in deriving three functions from the introduction of two kinds of functional units into a supramolecular material. 相似文献
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Dr. Guoju Yang Dr. Sneha A. Akhade Xi Chen Dr. Yue Liu Dr. Mal‐Soon Lee Dr. Vassiliki‐Alexandra Glezakou Dr. Roger Rousseau Prof. Dr. Johannes A. Lercher 《Angewandte Chemie (Weinheim an der Bergstrasse, Germany)》2019,131(11):3565-3570
The thermodynamic state of H2 adsorbed on Pt in the aqueous phase was determined by kinetic analysis of H2 reacting with D2O to HDO, HD, and D2, and by DFT‐based ab initio molecular dynamics simulations of H2 adsorption on Pt(111), Pt(110), and Pt nanoparticles. Dissociative adsorption of H2 on Pt is significantly weakened in the aqueous phase compared to adsorption at gas–solid interfaces. Water destabilizes the adsorbed H atoms, decreasing the heat of adsorption by 19–22 kJ while inducing an additional entropy loss of 50–70 J K?1. Upon dissociative adsorption of H2, the average distance of water from the Pt surface increases and the liquid adopts a structure that is more ordered than before close to the Pt surface, which limits the translation mobility of the adsorbed H atoms. The presence of hydrated hydronium ions next to the Pt surface further lowers the H?Pt bond strength. 相似文献
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Xingfeng Wang Clement Bommier Dr. Zelang Jian Zhifei Li Raghu S. Chandrabose Ismael A. Rodríguez‐Pérez Prof. P. Alex Greaney Prof. Xiulei Ji 《Angewandte Chemie (Weinheim an der Bergstrasse, Germany)》2017,129(11):2955-2959
We demonstrate for the first time that hydronium ions can be reversibly stored in an electrode of crystalline 3,4,9,10‐perylenetetracarboxylic dianhydride (PTCDA). PTCDA exhibits a capacity of 85 mAh g−1 at 1 A g−1 after an initial conditioning process. Ex situ X‐ray diffraction revealed reversible and significant structure dilation upon reduction of PTCDA in an acidic electrolyte, which can only be ascribed to hydronium‐ion intercalation. The lattice expansion upon hydronium storage was theoretically explored by first‐principles density functional theory (DFT) calculations, which confirmed the hydronium storage in PTCDA. 相似文献
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Xianyong Wu Aaron Markir Lu Ma Yunkai Xu Heng Jiang Daniel P. Leonard Woochul Shin Tianpin Wu Jun Lu Xiulei Ji 《Angewandte Chemie (Weinheim an der Bergstrasse, Germany)》2019,131(36):12770-12775
The elemental sulfur electrode with Cu2+ as the charge carrier gives a four‐electron sulfur electrode reaction through the sequential conversion of S?CuS?Cu2S. The Cu‐S redox‐ion electrode delivers a high specific capacity of 3044 mAh g?1 based on the sulfur mass or 609 mAh g?1 based on the mass of Cu2S, the completely discharged product, and displays an unprecedently high potential of sulfur/metal sulfide reduction at 0.5 V vs. SHE. The Cu‐S electrode also exhibits an extremely low extent of polarization of 0.05 V and an outstanding cycle number of 1200 cycles retaining 72 % of the initial capacity at 12.5 A g?1. The remarkable utility of this Cu‐S cathode is further demonstrated in a hybrid cell that employs an Zn metal anode and an anion‐exchange membrane as the separator, which yields an average cell discharge voltage of 1.15 V, the half‐cell specific energy of 547 Wh kg?1 based on the mass of the Cu2S/carbon composite cathode, and stable cycling over 110 cycles. 相似文献
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Jessica J. Hong Liangdong Zhu Cheng Chen Longteng Tang Heng Jiang Bei Jin Trenton C. Gallagher Qiubo Guo Chong Fang Xiulei Ji 《Angewandte Chemie (Weinheim an der Bergstrasse, Germany)》2019,131(44):16057-16062
Plating battery electrodes typically deliver higher specific capacity values than insertion or conversion electrodes because the ion charge carriers represent the sole electrode active mass, and a host electrode is unnecessary. However, reversible plating electrodes are rare for electronically insulating nonmetals. Now, a highly reversible iodine plating cathode is presented that operates on the redox couples of I2/[ZnIx(OH2)4?x]2?x in a water‐in‐salt electrolyte. The iodine plating cathode with the theoretical capacity of 211 mAh g?1 plates on carbon fiber paper as the current collector, delivering a large areal capacity of 4 mAh cm?2. Tunable femtosecond stimulated Raman spectroscopy coupled with DFT calculations elucidate a series of [ZnIx(OH2)4?x]2?x superhalide ions serving as iodide vehicles in the electrolyte, which eliminates most free iodide ions, thus preventing the consequent dissolution of the cathode‐plated iodine as triiodides. 相似文献
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Xiaona Li Jianwen Liang Ning Chen Jing Luo Keegan R. Adair Changhong Wang Mohammad Norouzi Banis Tsun‐Kong Sham Li Zhang Shangqian Zhao Shigang Lu Huan Huang Ruying Li Xueliang Sun 《Angewandte Chemie (Weinheim an der Bergstrasse, Germany)》2019,131(46):16579-16584
To promote the development of solid‐state batteries, polymer‐, oxide‐, and sulfide‐based solid‐state electrolytes (SSEs) have been extensively investigated. However, the disadvantages of these SSEs, such as high‐temperature sintering of oxides, air instability of sulfides, and narrow electrochemical windows of polymers electrolytes, significantly hinder their practical application. Therefore, developing SSEs that have a high ionic conductivity (>10?3 S cm?1), good air stability, wide electrochemical window, excellent electrode interface stability, low‐cost mass production is required. Herein we report a halide Li+ superionic conductor, Li3InCl6, that can be synthesized in water. Most importantly, the as‐synthesized Li3InCl6 shows a high ionic conductivity of 2.04×10?3 S cm?1 at 25 °C. Furthermore, the ionic conductivity can be recovered after dissolution in water. Combined with a LiNi0.8Co0.1Mn0.1O2 cathode, the solid‐state Li battery shows good cycling stability. 相似文献
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Guofeng Liu Cheng Zhou Wei Liang Teo Cheng Qian Yanli Zhao 《Angewandte Chemie (Weinheim an der Bergstrasse, Germany)》2019,131(28):9466-9472
Self‐sorting, simultaneous, and orthogonal operations during the self‐assembly of complex mixtures are commonly observed for biological species but rare in artificial systems. In this study, we designed two gelators (LPF and LPFEG) containing the same chiral phenylalanine core but different achiral peripheral substituents to give hydrogels with opposite supramolecular handedness. When the two hydrogels were mixed, double‐network nanofibers with opposite handedness were formed by spontaneous high‐order organization and self‐sorting of the two gelators. The chiroptical activity of the double‐network hydrogels could be tuned by varying the molar ratio of LPF and LPFEG in the mixture, thus showing that the two gelators were highly independent of each other. Enhanced mechanical properties were observed for the interpenetrating networks when the LPF/LPFEG molar ratio was 3:7, with a more than fourfold increase in both the storage (G′) and loss modulus (G′′) relative to those of the individual hydrogels. 相似文献