JOURNAL OF ORGANIC CHEMISTRY
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2026
·
IF 3.3
Zhiyou Li,Ling Yang,Jiahua Zhou,Long Liu,Jie Tang,Tianzeng Huang,Chunya Li,Tieqiao Chen
Selective O-acylation of ketones with carboxylic acids was disclosed, which produced a wide range of enol esters in good to high yields with Z-configured regioselectivity. This reaction showed high functional group tolerance and could be performed on a gram scale without any decrease of synthetic efficiency. When o-bromobenzoic acids were used, the corresponding enol esters could be easily derivatized into the value-added chromones via Claisen condensation tandem cyclization.
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Small Methods
·
2022
·Vol. 6
·期 7
·2200449
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IF 15.367
Junhua Zhou,Zhujie Chen,Guo Yu,Keni Ma,Xueyu Lian,Shuo Li,Qitao Shi,Jiaqi Wang,Lingli Guo,Yu Liu,Alicja Bachmatiuk,Jingyu Sun,Ruizhi Yang,Jin-Ho Choi,Mark H. Rümmeli
Lithium-rich cathodes (LRCs) show great potential to improve the energy density of commercial lithium-ion batteries owing to their cationic and anionic redox characteristics. Herein, a complete conductive network using carbon nanotubes (CNTs) additives to improve the poor kinetics of LRCs is fabricated. Ex situ X-ray photoelectron spectroscopy first demonstrates that the slope at a low potential and the following long platform can be assigned to the transition metal and oxygen redox, respectively. The combination of galvanostatic intermittent titration technique and electrochemical impedance spectroscopy further reveal that a battery with CNTs exhibited accelerated kinetics, especially for the O-redox process. Consequently, LRCs with CNTs exhibit a much better rate and cycling performance (≈89% capacity retention at 2 C for over 200 cycles) than the Super P case. Eventually, TEM results imply that the improved electrochemical performance of the CNTs case also benefits from its more stable bulk and surface structures. Such a facile conductive additive modification strategy also provides a universal approach for the enhancement of the electron diffusion properties of other electrode materials.
研究领域:
材料科学
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能源存储与转换
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MATERIALS LETTERS
·
2025
·
IF 2.7
Ying Chen,Chang Liu,Mengxue Hu,Qingfang Li,Jing Su
In this work, KCuCl₃ and K₂CuCl₄·2H₂O crystals were synthesized via a solution evaporation method. Their crystal structures were verified by XRD, while the (110) interplanar spacing of K₂CuCl₄·2H₂O was further identified by HRTEM and the corresponding SAED. Thermal behavior was examined using TG/DSC. Both compounds exhibit reversible discoloration in response to temperature (20–100 °C) and humidity (0–80 % RH). UV–Vis absorption reveals band gaps of 3.05 eV for KCuCl₃ and 3.09 eV for K₂CuCl₄·2H₂O. PL spectra show blue-green emission, with CIE coordinates indicating a warmer hue for K₂CuCl₄·2H₂O, primarily attributed to the Cu 2+ centers. The strong light absorption and efficient PL response of these halides highlight their potential for humidity sensing and luminescent device applications.
研究领域:
材料科学
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无机化学
·
光学材料
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晶体学
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传感器技术
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JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY
·
2025
·
IF 6.2
Yijie Li,Shun Zeng,Weinong Zhang,Junbo He,Jiangtao Feng
Peach brown rot, caused by Monilinia fructigena (M. fructigena), is a destructive disease that affects peaches during pre- and postharvest stages. In this study, two 1-O-alkylglycerols (AKGs), namely, AKG-2 (1-O-dodecylglycerol) and AKG-4 (3-(2-ethylhexyloxy)propane-1,2-diol), demonstrated significant in vitro antifungal activity against M. fructigena, with EC50 values of 102 and 103 μg/mL, respectively. At a concentration of 200 μg/mL, both compounds effectively suppressed brown rot symptoms in inoculated peaches, achieving a protective efficacy of 93.2%. Mechanistic investigations revealed that AKG-2 and AKG-4 disrupted the surface morphology and internal ultrastructure of fungal hyphae, compromised the integrity of the cell membrane and nucleus, and reduced mitochondrial membrane potential. Moreover, treatment with these compounds induced the accumulation of reactive oxygen species, leading to elevated malondialdehyde levels and decreased activities of key antioxidant enzymes including superoxide dismutase and catalase. These results suggest that AKG-2 and AKG-4 exhibit antifungal effects through multiple synergistic mechanisms including membrane and nuclear damage, mitochondrial dysfunction, and oxidative stress induction. This study, for the first time, provides valuable mechanistic insights into the antifungal effects of AKGs and supports their potential as naturally derived fungicidal agents for the protection of peach fruits.
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JOURNAL OF PHYSICAL CHEMISTRY A
·
2023
·
IF 2.9
Shuihui Jin,Ruijing Wang,Huan Chen,Xu Yuan,Xinxing Zhang
Microdroplet chemistry has been an emerging new field for its large plethora of unique properties, among which an especially intriguing one is the strong oxidizing and reducing powers. The hydroxide ion in water microdroplets is considered to split into a hydroxyl radical and an electron at the air–water interface, and the former is responsible for the oxidizing capability while the latter is responsible for the reducing power, making a unity of opposites. However, to date there are only two examples showing that oxidation and reduction occur simultaneously to the same substrates, which might be a result of the redox properties of the substrate per se. In this study, we carefully chose a group of ο-quinone compounds as the substrates in water microdroplets and discovered that they can be both oxidized by the hydroxyl radical and reduced by the electron. These results keep pushing the limit of the unique redox properties of microdroplet chemistry.
研究领域:
微滴化学
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物理化学
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分析化学
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氧化还原化学
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ACS Applied Materials & Interfaces
·
2023
·
IF 9.5
Meilan Pan,Xue Zhang,Chenglei Pan,Jiong Wang,Bingjun Pan
Strategies for harmonizing the construction of an active site and the building of electron transport for a hybrid MoS2 catalyst are crucial for its application in electrochemical reactions. In this work, an accurate and facile hydrothermal strategy was proposed to fabricate the active center of Co–O–Mo on a supported MoS2 catalyst by forming a CoMoSO phase on the edge of MoS2, yielding (Co–O)x-MoSy (x = 0, 0.3, 0.6, 1, 1.5, or 2.1). The results show that the electrochemical performances (hydrogen evolution reaction (HER), oxygen evolution reaction (OER), and electrochemical degradation) of the yielded MoS2-based catalysts were positively correlated with the Co–O bonds, verifying the significant role of Co–O–Mo as the active center. The fabricated (Co–O)-MoS0.9 presented an extremely low overpotential and Tafel slope in both HER and OER, and it also demonstrated excellent BPA removal in the electrochemical degradation reaction. As compared with the Co–Mo–S configuration, the configuration of Co–O–Mo not only serves as the active center but also provides a conducting channel to facilitate electron conductivity with more accessible charge transfer at the electrode/electrolyte interface, which is favorable for electrocatalytic reaction. This work offers a new perspective for the active mechanism of metallic-heteroatom-dopant electrocatalysts and further boosts research on the development of noble/non-noble hybrid electrocatalysts in the future.
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Advanced Composites and Hybrid Materials
·
2023
·Vol. 6
·期 1
·1-9
·
IF 20.1
Du Peng,Lin Chaoliang,He Xian,Zheng Zhichuan,Xie Xinyu,Huang Kai,Lei Ming,Tang Haolin
Developing relatively cost-effective and high-performance Ru-based composites as electrocatalysts for acidic oxygen evolution has become the critical step toward emerging renewable energy conversion, in which exploring controllable synthetic strategies and investigating the intrinsic nature by non-metallic interfacial modulation is highly desirable. In this work, a facile tandem process is proposed by ball-milling and thermal annealing for the scalable synthesis of Ru–O–Se nanocomposites with in-situ formed crystalline RuSe 2 and metallic Ru heterostructures on a RuO 2 substrate. The optimized RuO x Se y -800 sample has been proved to have an excellent OER activity and long-term stability in an acidic electrolyte due to its suitable microscopic morphology and phase composition, along with a relatively smaller Tafel slope of 45.4 mV dec −1 compared with commercial RuO 2 and most similar catalysts reported in the literature. The outstanding acidic OER performance can be ascribed to the enhanced electron transfer and more active site exposure by controllable selenization. This work paves a novel way for the design and large-scale production of various non-metallic modified composite catalysts for extensive applications of energy conversion and storage.
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CHEMICAL ENGINEERING SCIENCE
·
2023
·
IF 4.7
Peng Zhang,Ziling He,Xiaoming Luo,Zihan Jia,Limin He
Graphene oxide (GO) modified mesh was prepared by dip-coating with stainless steel mesh as substrate and GO as modification material for separating O/W emulsions. The chemical composition, micromorphology and wettability of the modified mesh were characterized. GO adhered more evenly to wire surface of the higher-mesh, making higher-mesh modified mesh surface more hydrophilic-underwater oleophobic. The effects of mesh number, modification time and stacking layers on water flux and separation efficiency were studied through step-by-step optimization. It was concluded that the triple-layer 2800 mesh secondary modified mesh exhibited the best separation performance considering both water flux and separation efficiency. On this basis, the optimal modified mesh was comprehensively tested by varying the temperature, salt content, pH value and oil physical properties. The separation performance also proved favorable in terms of stability and durability. Therefore, the proposed GO modified mesh exhibits significant advantages and industrial application prospects for separating O/W emulsions.
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ADVANCED FUNCTIONAL MATERIALS
·
2023
·Vol. 33
·期 44
·2303986
·
IF 19
Xuefei Xu,Habib Ullah,Muhammad Humayun,Linfeng Li,Xia Zhang,Mohamed Bououdina,Damien P. Debecker,Kaifu Huo,Deli Wang,Chundong Wang
Constructing multiple heterogeneous structures allows for improving the electrocatalytic activity of NiO by incorporating multiple active sites. Unfortunately, the poor conductivity of NiO makes efficient charge transfer within the heterogeneous structures difficult, thereby inhibiting the improvement of its intrinsic activity. Herein, F-doped NiO/Ni@C heterogeneous catalyst (F-NiO/Ni@C) is fabricated via a new organic-inorganic hybrid approach, showing both advanced hydrogen evolution reaction (HER) and urea oxidation reaction (UOR) activity. The targeted F-doping increases electron delocalization, and facilitates electron transfer from Ni to NiO at the nano-interfaces. This interphase synergy provides ready-to-use F-NiO active sites, allowing F-NiO/Ni@C to achieve optimum H* adsorption Gibbs free energy for HER and a lower energy barrier for UOR. As a result, the as-configured F-NiO/Ni@C || F-NiO/Ni@C cell requires an ultra-low cell voltage of 1.37 V to achieve 10 mA cm −2 in alkaline media (with 0.3 M urea), outperforming the state-of-the-art benchmark Pt/C|| RuO 2 cell (1.45 V). This study reveals the positive impact of anion doping on interphase synergy and provides useful guidelines for designing monometallic catalysts for UOR as well as hydrogen generation.
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International Journal of Electrochemical Science
·
2023
·
IF 1.5
Hongmei Zhang,Yuqing Gui,Yan Cao,Min Wang,Benzhi Liu
Molecularly imprinted electrochemical sensor for the detection of sulfamethoxazole was prepared by electropolymerization with sulfamethoxazole as template molecule and o-phenylenediamine as functional monomer. Electrochemical performance of molecularly imprinted sensor was studied by cyclic voltammetry in 0.1 mol/L KCl solution containing 5 μM K 3 Fe(CN) 6 . On the optimal experimental conditions, square wave voltammetry was used to detect sulfamethoxazole. The square wave voltammetric peak current difference of the sensor has a good linear relationship with the concentration of sulfamethoxazole in the range of 0.2to 1.4 μM, and the detection limit is 0.05 μM. The molecularly imprinted sensor has good selectivity, repeatability and stability.
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FUEL PROCESSING TECHNOLOGY
·
2022
·
IF 8.129
Wang Li,Wen-Ying Li,Xing-Bao Wang,Jie Feng
During direct coal liquefaction , selective C al –O bond cleavage is critical for phenol production. In this study, anisole and benzyl phenyl ether were chosen as the oxygen-containing model compounds. Radical-induced sites of benzyl phenyl ether were investigated using the Fukui function and energy barrier calculation. The promotion routes of the C al –O bond cleavage in anisole and benzyl phenyl ether by radicals were illustrated. The formation of o -benzyl phenol was regarded as a sign of benzyl radical-induced pyrolysis based on the most optimal path. The competitive process between the optimal path and β-bond scission path was analyzed from the rate constant perspective. Radical-induced pyrolysis made remarkable differences in product selectivity for benzyl phenyl ether. Similarly, the cleavage of the C al –C al bond can also be promoted using two methods of radical induction, which is referred to as a radical chain process. In contrast to benzyl phenyl ethers, the induced pyrolysis of the C al –C al bond in bibenzyl is more likely to occur via β-bond scission after the H of CH 2 is abstracted by a radical. The findings of this research would provide a theoretical foundation for comprehending the radical mechanism of direct coal liquefaction.
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CERAMICS INTERNATIONAL
·
2022
·
IF 5.532
Xishi Wu,Tongzhou Chen,Bijie Wang,Yujie Song,Qing Huang,Zhengren Huang
In this study, novel polyborosilazane-derived SiBCN(O) ceramic was used as self-healing component in self-healing C f /SiBCN(O) composite, which was prepared by polymer infiltration and pyrolysis (PIP) process. Molecular-level structure design of boron-containing ceramic precursors was utilized to achieve uniform dispersion of boron-containing self-healing components in prepared composites. No elemental diffusion was observed at the interface of ceramic matrix and carbon fibers, which resulted in stable SiBCN(O) structure. In addition, boron was uniformly distributed in C f /SiBCN(O) composite ceramic matrix , which was beneficial for self-healing of cracks. Cracks and indentations were able to heal at high temperatures in air. The best crack-healing behavior occurred in air atmosphere at 1000 °C, with nearly complete crack healing. This excellent self-healing behavior was achieved because silicon and boron atoms in SiBCN(O) ceramic reacted with available oxygen at high temperatures to form SiO 2 (l), B 2 O 3 (l), and B 2 O 3 ·xSiO 2 liquid phases, which effectively filled cracks. In general, as-prepared C f /SiBCN(O) composite exhibited excellent self-healing properties and shows great application potential in high-temperature environment applications such as aviation, aerospace, and nuclear power.
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