CHEMICAL ENGINEERING JOURNAL
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2024
·
IF 13.3
Su Wang,Qifang Sun,Chen Li,Dongge Wang,Yue Ma,Hongzhou Zhang,Xixi Shi,Lianqi Zhang,Dawei Song
Given the high combustion or explosion potential of liquid electrolyte, polymer electrolytes have attracted intensive attention due to high safety, compatible interface and flexible processability. However, the related low ionic mobility remains an issue for related wide application. Herein, a crosslinked polymer electrolyte (abbreviated as PMEP) comprising abundant oxygen-contained groups (C-O-C/C=O) is developed. With the crosslinking agent of ethoxylated trimethylolpropane triacrylate (ETPTA), a high transference number ( t Li + =0.69) is obtained since C-O/C=O are conducive to the transfer of Li ions. Specifically, C=O group exists in individual monomers in order to be applicable to high voltage cathode, therefore, a criss-cross network containing abundant sites conducive to ion transport is constructed and rapid ion transfer as well as enhanced mechanical strength can be realized even in high potential system. With the coordination effect of C-O and C=O, PMEP exhibits rapid Li ion transfer and a wide electrochemical stability window of 5.1 V. As for Li//Li symmetrical cell, a stable voltage profile with slight polarization of 60 mV is displayed for over 550 h at 1 mA cm −2 . After assembled with LiNi 0.8 Co 0.15 Al 0.05 O 2 cathode, a high discharge specific capacity of 190.6 mAh g −1 is delivered and the capacity retention reaches 86 % at 0.1C for 100 cycles. This work provides a promising method for designing high-performance polymer electrolytes for lithium metal batteries.
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Scientific Reports
·
2021
·Vol. 11
·期 1
·1-9
·
IF 4.38
Zou Weihua,Li Zimu,Wang Zhangheng,Sun Delin,Zhang Pingfang
The red thermochromic dye (R-TD) is the tetradecanoic acid tetradecyl ester (C 28 H 56 O 2 ) and methyl red (C 15 H 15 N 3 O 2 ) mixture that has better permeability enabling its infiltration into wood and better thermochromic properties changing its colour at above 30 °C after about 0.5 min. Thicker poplar-based thermochromic composite specimens (R-PTC, thickness: 5.0 mm) were prepared by filling the R-TD into pre-treated poplar veneer (thickness: 5.0 mm) thus allowing better penetration after pre-treatment. After R-TD infiltration, the R-PTC samples were covered by polypropylene wax for preventing R-TD from overflowing from R-PTC under the action of phase-change temperature. This R-PTC, whose colour can change from light-red to dark-red at 38 °C to 46 °C, can recover to light-red at below 38 °C after about 14 h, and the peak of colour change is at about 42 °C. R-PTC will be suitable for materials used in thermochromic furniture that can indicate the surface temperature to potential users, thus allowing assessment of likely scalded pain when used the furniture.
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NEW JOURNAL OF CHEMISTRY
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2017
·Vol. 41
·期 4
·1834-1839
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IF 3.269
Ying Zhang,Zijian Gao,Zhe Yu,Xiuyan Ren,Lijie Duan,Guang Hui Gao
In this manuscript, hydrogels with pH-tunable mechanical properties were prepared via transforming the non C–C covalent synergistic interactions of hydrogen bonding, metal ion coordination and hydrophobic effects. The fracture stress of hydrogels exhibited a tendency to firstly decrease and then increase with an increase of pH from 3.0 to 9.0. That is, the fracture stress was enhanced due to the synergistic interactions of hydrophobic effects and hydrogen bonding among carboxylic acid groups at pH 3.0. Then, the strength gradually decreased due to the disappearance of hydrogen bonding at pH from 3.0 to 5.0. Moreover, the fracture stress was also significantly enhanced at pH over 5.0 due to the synergistic interactions of hydrophobic effects and metal ion coordination. Consequently, it is envisioned that the strategy to design novel hydrogels with pH-tunable mechanical properties would provide more interesting directions for hydrogels based on non C–C covalent synergistic interactions in potential biomedical applications.
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RSC Advances
·
2016
·Vol. 6
·期 76
·72744-72749
·
IF 3.289
Fei Xia,Zhongtian Du,Junxia Liu,Yangyang Ma,Jie Xu
Recently, obtaining value-added chemicals from biomass resources has attracted considerable attention. Levulinic acid is one of the most important biomass platform compounds, which could be obtained from carbohydrate biomass. In this work, levulinic acid was selectively converted into C4 product, including succinic anhydride, via catalytic oxidation with a manganese catalyst in acetic anhydride. Moreover, an unexpected product of maleic anhydride was obtained, which greatly differs from that of levulinate ester. The pathway for formation of maleic anhydride was studied by monitoring and confirming intermediates α-angelica lactone and its derivative 2-methyl-5-oxotetrahydro-2-furanyl acetate. Based on the obtained mechanistic information, the different behaviour between the oxidative cleavage of levulinic acid and levulinate ester was further discussed.
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Nature Communications
·
2024
·Vol. 15
·期 1
·1-11
·
IF 14.7
Yang Xiaoju,Rong Chao,Zhang Li,Ye Zhenkun,Wei Zhiming,Huang Chengdi,Zhang Qiao,Yuan Qing,Zhai Yueming,Xuan Fu-Zhen,Xu Bingjun,Zhang Bowei,Yang Xuan
Developing in situ/operando spectroscopic techniques with high sensitivity and reproducibility is of great importance for mechanistic investigations of surface-mediated electrochemical reactions. Herein, we report the fabrication of highly ordered rhombic gold nanocube superlattices (GNSs) as substrates for surface-enhanced infrared absorption spectroscopy (SEIRAS) with significantly enhanced SEIRA effect, which can be controlled by manipulating the randomness of GNSs. Finite difference time domain simulations reveal that the electromagnetic effect accounts for the significantly improved spectroscopic vibrations on the GNSs. In situ SEIRAS results show that the vibrations of CO on the Cu 2 O surfaces have been enhanced by 2.4 ± 0.5 and 18.0 ± 1.3 times using GNSs as substrates compared to those on traditional chemically deposited gold films in acidic and neutral electrolytes, respectively. Combined with isotopic labeling experiments, the reaction mechanisms for C-C coupling of CO electroreduction on Cu-based catalysts are revealed using the GNSs substrates.
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Journal of the American Chemical Society
·
2025
·
IF 15.6
Wen Yan,Tiantian Wu,Jia Liu,Zhe Zheng,Ming Ma
Electrolyte cation identity has been reported to influence the multicarbon (C2+) selectivity in CO2/CO electroreduction. However, most of the previous work for cation size effect is based on H-cell configurations, which may inadvertently distort the underlying mechanism of cation effect due to mass transport limitations, particularly for CO reduction. Here, using GDE-type flow electrolyzers, we report that the selectivity of total C2+ products on Cu is independent of alkali cation identity (Li+, Na+, K+, and Cs+) in the absence of the CO transport limitation. Notably, a high concentration of strongly hydrated cation (such as Li+) inhibits the total C2+ formation in CO reduction, whereas total C2+ selectivity is retained upon increasing concentrations of weakly hydrated cation (such as K+). Further investigations reveal that the CO coverage at a low cation concentration is almost independent of the cation identity, but the CO coverage at highly concentrated cations strongly relies on the alkali cation identity.
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CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Wang Luyan,Liu Rongjun,Wang Yanfei,Li Duan,Miao Huaming
The oxidation resistance of C/C composites in dynamic environments across a wide temperature range still needs improvement. Studies have shown that doping with Al can enhance the oxidation resistance of ultra-high-temperature ceramic coatings over a broad temperature range. However, there has been limited research on the oxidation behavior of Al-doped ultra-high-temperature ceramic coatings under dynamic conditions.In this study, HMSSB (HfB 2 , MoSi 2 , SiC, SiO 2 , B 2 O 3 ) coatings and Al-doped HMSSB (A-HMSSB) coatings were prepared on SiC-coated C/C composites. After oxidation at 1200°C and 1500°C for 4 h and 5 h, respectively, the SiC/HMSSB composite coating exhibited significant porosity, leading to severe oxidation of the C/C substrate. In contrast, the SiC/A-HMSSB coating formed a dense and well-sealed oxide glass layer, resulting in lower mass loss rates of 10.08% and 9.23% after oxidation.
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Nature Chemistry
·
2025
·
IF 20.2
Li Lei,Cui Chunhua
Electrocatalysis has long been viewed as an interfacial process, so the role of bulk water redox chemistry remains largely unexplored. Here we demonstrate that electrolyte-induced water redox radicals activate reactants in bulk solution for electrocatalysis at electrified interfaces. Using formate as a model electrolyte, we show that hydrogen-bond disruption in bulk water generates redox radicals, which oxidize formate to generate C 1 intermediates, as revealed by electron paramagnetic resonance, high-resolution mass spectrometry and Raman spectroscopy. Formate concentration-dependent hydrogen-bond restructuring drives the sequential generation of water-derived radicals and reactive intermediates, establishing bulk water as an active redox mediator rather than a passive solvent. In situ electrochemical studies demonstrate that these C 1 intermediates migrate to the Cu cathode surface, enabling C–C coupling via radical-mediated pathways. This work challenges the conventional view of electrocatalysis as solely an interfacial process and offers an alternative design principle for efficient electrochemical synthesis through tailored electrolyte engineering.
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ZEITSCHRIFT FUR ANORGANISCHE UND ALLGEMEINE CHEMIE
·
2022
·Vol. 649
·期 4
·e202200279
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IF 1.414
Shuai-Cong Huo,Yao Li,Peng-Fei Ji,De-Xiang Zhang,Zhi-Jiao Zhang,Ying Yang,Herbert W. Roesky
Treatments of β -diketiminate aluminum dihydride LAlH 2 (L=HC[C(Me)N(Ar)] 2 , Ar=2,6- i Pr 2 C 6 H 3 ) with (2-chlorophenyl)methanol, 2,3-dimethylbutane-2,3-diol, 2,2-dimethylpropane-1,3-diol, 2,2-bis(bromomethyl)propane-1,3-diol, and p -diphenol resulted in the formation of compounds containing the C−O−Al−O−C linkages, including the acyclic LAl[( μ -O)CH 2 ( o -Cl−C 6 H 4 ) 2 ] 2 ( 1 ), the five-membered ring LAl[( μ -O)CMe 2 ] 2 ( 2 ), the six-membered ring LAl[( μ -O)CH 2 ] 2 CMe 2 ( 3 ) and LAl[( μ -O)CH 2 ] 2 C(CH 2 Br) 2 ( 4 ), and the macrocyclic [LAl( μ -O) 2 ( p -C 6 H 4 )] 4 ( 5 ), respectively. These practices prove that β -diketiminate aluminum dihydride is a valuable precursor for the preparation of acyclic and cyclic systems. 1 – 5 were characterized by melting point, 1 H and 13 C NMR, FT-IR, and single-crystal X-ray diffraction studies.
研究领域:
无机化学
·
材料化学
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JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
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2025
·
IF 14.3
Junjie Xu,Wei Sun,Xiang Xiong,Yi Zeng,Qingbo Wen
Conventional ultra-high-temperature ceramic-modified carbon/carbon composites (C/C-UHTCs) face limitations such as excessive erosion in the gas environment of solid rocket motors (SRMs). In contrast, metal-reinforced C/C-UHTCs exhibit enhanced mechanical properties, thermophysical characteristics, and resistance to high-temperature erosion. These advantages indicate significant potential for metal-reinforced C/C-UHTCs to augment the thrust capabilities of SRMs. This study demonstrated the preparation of (Hf, Zr, Ti)C-(Hf, Zr, Ti)B 2 -W-Cu cermet modified C/C composites using slurry infiltration and reactive melt infiltration at 1400°C. The microstructure, formation mechanisms, mechanical properties, and thermophysical properties of C/C-(Hf, Zr, Ti)C-(Hf, Zr, Ti)B 2 -W-Cu composite materials, as well as the ablation behavior of the composite materials under the SRM environment were compared. The results showed that the linear and mass ablation rates of the C/C-(Hf, Zr, Ti)C-(Hf, Zr, Ti)B 2 -W-Cu composite material decreased by 112.1% and 160.4% (0.074 mm s −1 , 0.086 g s −1 ), respectively, compared with those of the C/C-(Hf, Zr, Ti)C composite material. This could be attributed to the formation of a dense, high-strength W-skeleton composite (Hf, Zr, Ti)O 2 oxide layer during the ablation of the C/C-(Hf, Zr, Ti)C-(Hf, Zr, Ti)B 2 -W-Cu composite, which effectively resisted erosion from high-temperature, high-speed and high-particle-concentration two-phase gas flow. This work presents a novel approach to enhancing the ablation resistance of C/C-UHTCs and holds significant promise for the development of structural materials in SRM environments.
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PHYSICAL CHEMISTRY CHEMICAL PHYSICS
·
2020
·Vol. 22
·期 20
·11508-11518
·
IF 3.43
Jing Chen,Hanling Yang,Hongquan Fu,Hongyan He,Qiang Zeng,Xuehui Li
Electrochemical oxidation is a promising and effective method for lignin depolymerization owing to its selective oxidation capacity and environmental friendliness. Herein, the electrooxidation of non-phenolic alkyl aryl ether monomers and β-O-4 dimers was experimentally (by cyclic voltammetry, in situ spectroelectrochemistry, and gas chromatography-mass spectroscopy) and theoretically (by DFT calculations) explored in detail. Compared to the reported literature (T. Shiraishi, T. Takano, H. Kamitakahara and F. Nakatsubo, Holzforschung, 2012, 66(3), 303–309), 1-(4-ethoxyphenyl)ethanol showed a distinguishable oxidation pathway, where the resulting carbonyl product surprisingly underwent a bond cleavage on alkyl–aryl ether to ultimately produce a quinoid like compound. In contrast, β-O-4 dimers, like 2-phenoxy-1-phenethanol and 2-phenoxyacetophenone also demonstrated electrochemical oxidation induced by Cβ–O and Cα–Cβ bond cleavages. For the oxidation products, the presence of the Cα-hydroxyl group in dimers was the key to selectively generate aldehyde-containing species under mild electrochemical conditions, otherwise it produces alcohol-containing products following a different mechanism compared to the CαO containing dimers.
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INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2024
·
IF 3.8
Chuhan Zhang,Yanchang Chu,Linying Fu,Qiuyue Wang,Rui Ma,Donghai Xu,Le Yang
Lignin, a renewable resource rich in aromatic ring structures in nature, is an ideal natural source to produce aromatic compounds and cycloparaffin. Herein, we prepare MOF-derived Ni–MoxC/C and Co–MoxC/C as catalysts for the depolymerization of lignin and dimeric model compounds. Diphenyl ether (DPE) with 4-O-5 bond, benzyl phenyl ether (BPE) with α-O-4, and phenethyl phenyl ether (PPE) with β-O-4 are chosen as dimeric model compounds. Overall, Ni–MoxC/C and Co–MoxC/C show distinguished different activity toward product distribution. Ni–MoxC/C facilitates both C–O bond cleavage and hydrogenation of the benzene ring, and the main products are ethyl cyclohexane and cyclohexanol for all three model compounds. In contrast, Co–MoxC/C only facilitates C–O bond cleavage and obtains phenol and ethylbenzene as products. Similarly, for the depolymerization of lignin, cycloparaffins are obtained on Ni–MoxC/C, while phenol, guaiacol, 2,6-dimethoxyphenol, and their respective derivatives are obtained on Co–MoxC/C.
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