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Imidazole-Linked Fully Conjugated Covalent Organic Framework for High-Performance Sodium-Ion Battery

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CCS chemistry 2024年第5期6卷 1255-1263页

作者： Lu Liu Yu Gong Yifan Tong Hao Tian Xubo Wang Yiming Hu Shaofeng Huang Weiwei Huang Sandeep Sharma Jingnan Cui Yinghua Jin Weitao Gong Wei Zhang State Key Laboratory of Fine Chemicals School of Chemical EngineeringDalian University of TechnologyDalian 116024 department of chemistry University of Colorado BoulderBoulderColorado 80309 Hebei Key Laboratory of applied chemistry Yanshan UniversityQinhuangdao 066004

Covalent organic frameworks(COFs)have garnered increasing attention as promising electrode materials for sodium-ion batteries(SIBs)due to their ordered backbones,uniform pore sizes,and high surface ***,they also face challenges,including low capacity,unsatisfactory rate performance,and limited cycling stability,which pose the primary obstacles to their practical ***,a pyrenoimidazole-based COF,denoted as PyIm-COF,has been synthesized as a novel electrode material for highperformance SIBs using an efficient synthetic *** extended fully conjugated backbones and readily accessible redox-active sites,PyIm-COF demonstrates remarkable high-rate performance,delivering around 250 m Ah g^(−1)and excellent cycling stability,retaining 97.2%of its capacity even after 2500 cycles at 5 A g^(−1),which is higher than that of most previously reported COF-based *** work provides valuable insights into the development of nitrogen-rich conjugated COF electrode materials for rechargeable SIBs.

关键词： pyrenoimidazole fully conjugated backbones covalent organic framework electrode material sodium-ion battery

One-step construction of strongly coupled Co_(3)V_(2)O_(8)/Co_(3)O_(4)/MXene heterostructure via in-situ Co-F bonds for high performance all-solid-state asymmetric supercapacitors

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Rare Metals 2024年第2期43卷 682-691页

作者： Ji Zhou Bin-Bin Liu Hu Zheng Wen-Qing Ma Qian Li Cai-Xia Xu Institute for Advanced Interdisciplinary Research(iAIR) Collaborative Innovation Center of Technology and Equipment for Biological Diagnosis and Therapy in Universities of ShandongSchool of Chemistry and Chemical EngineeringUniversity of JinanJinan250022China

Co_(3)V_(2)O_(8)/Co_(3)O_(4)/Ti_(3)C_(2)T_(x) composite was easily synthesized via one-step succinct-operated hydrothermal *** interconnected Co_(3)V_(2)O_(8)/Co_(3)O_(4) nanowires network can in-situ grow and anchor on the surface of Ti_(3)C_(2)T_(x) via the strong Co-F bonds and contribute tremendously to depress Ti_(3)C_(2)T_(x) *** from the synergistically interplayed effect among the multiple interfaces and high conductivity of Ti_(3)C_(2)T_(x) as well as outstanding stability of the as-designed nanostructure,the optimum Co_(3)V_(2)O_(8)/Co_(3)O_(4)/Ti_(3)C_(2)T_(x)electrode reaches a commendable specific capacitance(up to 3800 mF·cm^(−2)),great rate capability(80%capacitance retention after 20-times current increasing),and preeminent cycling stability(95.4%/85.5%retention at 7000th/20,000th cycle).Moreover,the all-solid-state asymmetric supercapacitor based on Co_(3)V_(2)O_(8)/Co_(3)O_(4)/Ti_(3)C_(2)T_(x) and active carbon can deliver a high energy density of 84.0μWh·cm^(−2) at the power energy of 3.2 mW·cm^(−2),and excellent cycling durability with 87.0%of initial capacitance retention upon 20,000 *** work provides a practicable pathway to tailor MXene-based composites for high-performance supercapacitor.

关键词： Ti_(3)C_(2)T_(x) Co_(3)V_(2)O_(8)/Co_(3)O_(4) Heterostructure Cathode Supercapacitor

Oxidative dissolution of Cr(OH)_(3) and mixed Fe-Cr(Ⅲ)phases by aqueous Mn(Ⅲ)-pyrophosphate complex

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Journal of Environmental Sciences 2024年第5期139卷 105-113页

作者： Mismel Ruiz-Garcia Jordan Stanberry Giovanna Ballerini Ribeiro Vasileios Anagnostopoulos department of chemistry University of Central FloridaOrlando FL 32816USA

The key role of manganese(Mn)in the biogeochemical cycle of trace elements has been of great interest in recent ***,the redox properties of aqueous Mn(Ⅲ)have been studied to a lesser ***(Ⅲ)is not stable in solution by ***,when complexed with inorganic ligands,it has shown potential to oxidize and reduce trace *** the present study,we are exploring the redox characteristics of the complex Mn(Ⅲ)-Pyrophosphate(Mn(Ⅲ)-PP).This complex is stable over a wide range of pH values but requires the ratio of Mn:PP to be less than 1:***,the redox reaction of chromium(Cr(Ⅲ))and Mn(Ⅲ)-PP is investigated.A solid,Cr(OH)_(3),is used as a source of Cr(Ⅲ).For this reaction,environmentally relevant parameters,such as pH,ionic strength,ratio Mn(Ⅲ)/Cr(Ⅲ),and excess of ligand,were *** showed that Mn(Ⅲ)can effectively oxidize Cr(Ⅲ)to Cr(Ⅵ),taking about 15 days for the reaction to *** reaction occurs only under acidic conditions(pH4),and with a low excess of *** initial Mn(Ⅲ)concentration decreases as the Cr(Ⅵ)is produced,and Cr(Ⅵ)can be adsorbed back into the Cr(OH)_(3)surface,limiting the mobility of this toxic *** this adsorption,significant amounts of Cr(VI)are release in the aqueous *** study shows the importance of a mobile species(Mn-PP complex)in the oxidation of Cr(Ⅲ)and the release of Cr(Ⅵ)to the environment.

关键词： Chromium Manganese Pyrophosphate complex Sorption Ionic strength Redox

Liquid-metals-induced formation of MXene/polyacrylamide composite organohydrogels for wearable flexible electronics

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Nano Research 2024年第3期17卷 1913-1922页

作者： Minying Wu Bin Chen Xueliang Fan Tong Ye Yuanyuan Fang Qian Zhang Fangzhou Zhou Yajun Wang Yi Tang department of chemistry Fudan UniversityShanghai 200433China College of chemistry&Materials Engineering Wenzhou UniversityWenzhou 325027China

Organohydrogels have demonstrated superior environmental adaptability and frost resistance compared to conventional hydrogels,thereby prompting considerable interests in the development and design of innovative ***,we report an effective one-pot method for fabricating MXene/polyacrylamide(MXene/PAM)composite organohydrogel(MAOH)by employing Ga liquid metals(Ga LMs)as a highly reactive component in the induced free radical polymerization reaction,without the need for additional heating or cross-linking *** synthetic protocol addresses the time-consuming and organic solvent waste concerns associated with traditional solvent displacement methods for organohydrogel *** incorporation of MXene not only highly enhances the conductivity but also confers improved mechanical properties of *** MAOH exhibits excellent environmental adaptability(>7 d),sustained moisture retention,remarkable self-healing capabilities,and outstanding mechanical properties under low temperatures(-20℃).It demonstrates exceptional performance in micro-motion monitoring,rapid response time(125 ms),superior stretchability,and a broad range of strains(0.3%–600%).Therefore,the designed MAOH has great potential for applications in diverse fields such as prosthetics,electronic skin,human–machine interaction,and smart terminals.

关键词： organohydrogels MXene conductivity mechanical properties environmental adaptability

Mapping super-resolution image quality

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Light(Science & Applications) 2024年第2期13卷 178-180页

作者： Megan A.Steves Ke Xu department of chemistry University of CaliforniaBerkeleyCA94720USA

The local quality of super-resolution microscopy images can be assessed and mapped by rolling Fourier ring correlation,even when image quality varies within a single image.

关键词： image resolution Mapping

Cation-πinteractions regulate electrocatalytic water oxidation over iridium single atoms supported on conjugated polymers

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Science China chemistry 2024年第6期67卷 2063-2069页

作者： Jing Bai Yunxia Liu Ziwei Ma Shouhan Zhang Guojie Chao Haiping Lin Elke Debroye Longsheng Zhang Tianxi Liu Key Laboratory of Synthetic and biological Colloids Ministry of EducationSchool of Chemical and Material EngineeringJiangnan UniversityWuxi214122China School of chemistry and Chemical Engineering Northwestern Polytechnical UniversityXi’an710072China School of Physics and Information Technology Shanxi Normal UniversityXi’an710062China department of chemistry KU LeuvenCelestijnenlaan 200FLeuven3001Belgium

Designing cost-effective and high-performing metal catalysts is significant for many renewable energy conversion *** metal loading without sacrificing activity and durability is highly desired for the catalyst design,especially for those reactions where the noble metals deliver the best catalyzing ***-atom catalysts(SACs)with maximal metalatom utilization,homogeneous and tailorable active sites have emerged as promising catalyst candidates,where the local coordination structures of the metal atoms in SACs largely determine the reaction *** design strategies of constructing strong metal-support interactions can stabilize the individual metal atoms in SACs,but present obstacles to provide a flexible manipulation platform for elaborately tailoring the coordination structures to achieve performance optimization towards a specifically targeted ***,for the proof-of-concept study,we report a novel design of SAC with iridium(Ir)single atoms supported on conjugated polymer,in which the adsorption energies of reaction intermediates on Ir atoms and the reaction kinetics towards acidic water oxidation can be readily optimized through modulating the formed cation-πinteractions that can be tailored by adjusting the molecular structures of conjugated *** strategy establishes a general route to develop targeted SACs for various catalytic reactions.

关键词： conjugated polymers single-atom catalysts cation-πinteractions oxygen evolution reaction

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A Hydrogen-Bonded,Hexagonally Networked,Layered Framework with Large Aperture Designed by Structural Synchronization of a Macrocycle and Supramolecular Synthon

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Precision chemistry 2024年第5期2卷 221-228页

作者： Hiroki Yoshimura Ryusei Oketani Miki Naruoka Norimitsu Tohnai Ichiro Hisaki Division of chemistry Graduate School of Engineering ScienceOsaka UniversityToyonakaOsaka 560-8531Japan department of applied chemistry Graduate School of EngineeringOsaka UniversitySuitaOsaka 565-0871Japan

To develop porous organic frameworks,precise control of the stacking manner of two-dimensional porous motifs and structural characterization of the resultant framework are *** these points of view,porous molecular crystals formed through reversible intermolecular hydrogen bonds,such as;hydrogen-bonded organic frameworks(HOFs),can provide deep insight because of their high crystallinity,affording single-crystalline X-ray diffraction *** this study,we demonstrate that the stacking manner of hydrogen-bonded hexagonal network(HexNet)sheets can be controlled by synchronizing a homological triangular macrocyclic tecton and a hydrogen-bonded cyclic supramolecular synthon called the phenylene triangle.A structure of the resultant HOF was crystallographically characterized and revealed to have a large channel aperture of 2.4 *** HOF also shows thermal stability up to 290°C,which is higher than that of the conventional HexNet frameworks.

关键词： hydrogen-bonded organicframeworks hexagonalnetwork macrocycle carboxylicacid porosity

ZnO Incorporated Acrylamide Grafted Chitosan Based Composite Film for Advanced Wound Healing Applications

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Open Journal of applied Sciences 2024年第4期14卷 1034-1051页

作者： Khodeja Afrin Kaniz Fatema Fariha Afrose Md. Abdus Samad Azad Md. Shamim Akter Md. Saiful Alam Papia Haque Yeasmin Akter Newaz Mohammed Bahadur department of applied chemistry and Chemical Engineering Noakhali Science and Technology University Noakhali Bangladesh department of applied chemistry and Chemical Engineering University of Dhaka Dhaka Bangladesh

This study was carried out to prepare ZnO nanoparticles incorporated acrylamide grafted chitosan composite film for possible biomedical application especially drug loading in wound healing. ZnO nanoparticles were prepared by co-precipitation method from zinc acetate di-hydrate and incorporated in acrylamide grafted chitosan. FT-IR and TGA of the prepared composite film confirmed the successful incorporation of ZnO nanoparticles in the acrylamide-grafted polymer matrix. SEM images showed that the ZnO nanoparticles were homogeneously distributed on the porous matrix of the composite film. Water uptake and buffer uptake analysis revealed that the composite film could hold water and buffer sufficiently, which facilitated the absorption of exudate from the wound site. Amoxicillin was loaded in the prepared composite film and the maximum loading efficiency was found to be 67.33% with drug concentration of 300 ppm. In vitro studies showed greater antimicrobial activity of drug-loaded composite film compared to both pure film and standard antibiotic disc. Finally, the In vivo mouse model showed maximum healing efficiency compared to conventional gauge bandages because the loading of antibiotic in the film produced a synergistic effect and healing time was reduced.

关键词： Chitosan ZnO Nanoparticles Wound Management Acrylamide Grafting Bacterial Resistance Drug Loading

Nano-sized stationary phase packings retained by single-particle frit for microchip liquid chromatography

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Chinese Chemical Letters 2024年第4期35卷 486-489页

作者： Wangyan Hu Ke Li Xiangnan Dou Ning Li Xiayan Wang Center Excellence for Environmental Safety and biological Effects Beijing Key Laboratory for Green Catalysis and SeparationDepartment of ChemistryBeijing University of TechnologyBeijing 100124China Center for Environmental Metrology National Institute of MetrologyBeijing 100029China

Modern chromatography is increasingly focused on miniaturization and integration. Compared to conventional liquid chromatography, microfluidic chip liquid chromatography(microchip-LC) has the potential due to its zero-dead volume connection and ease of integration. Nano-sized packings have the potential to significantly enhance separation performance in microchip-LC. However, their application has been hindered by packing difficulties. This study presents a method for packing nano-sized silica particles into a microchannel as the stationary phase. The microchip-LC packed column was prepared by combining the weir and the porous silica single-particle as frit to retain the packing particles. A surface tensionbased single-particle picking technique was established to insert porous single-particle frit into glass microchannels. Additionally, we developed a slurry packing method that utilizes air pressure to inject nano-sized packing into the microchannel. Pressure-driven chromatographic separation was performed using this nano-packed column integrated into a glass microchip. The mixture of four PAHs was successfully separated within just 8 min using a 5 mm separation channel length, achieving high theoretical plates(10~6plates/m). Overall, these findings demonstrate the potential of utilizing nano-sized packings for enhancing chromatographic performance in microchip systems.

关键词： Nano-size packing Single-particle frit Packed column Microchip LC Chromatographic separation