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Covalent organic framework materials with advanced topologies for efficient methane adsorption

Science China Materials 2025年第4期68卷 1298-1299页

作者： xuwen peng Hao Zhang Hongbo Zeng Department of Chemical and Materials Engineering Tsinghua UniversityBeijing 100084Chin a 2 Department of Chemical and Materials Engineering University of AlbertaEdmontonAlberta T6G IH9Canada

Methane,as the main component of natural gas,is a key transitional fuel resource due to its abundance and relatively low carbon emissions,aligning with global carbon neutrality objectives[1].Traditional natural gas storage methods,such as liquefied and compressed natural gas,require costly infrastructure and high-pressure ***,adsorbed natural gas offers a safer,more cost-effective,and environmentally friendly solution by enhancing storage capacity at reduced pressures through the use of methane adsorbents[2].

关键词： natural gas carbon neutrality natural gasis covalent organic frameworks transitional fuel resource liquefied compressed natural gasrequire enhancing storage capacity reduced pressures methane adsorption

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Stratum Corneum-Inspired Zwitterionic Hydrogels with Intrinsic Water Retention and Anti-Freezing Properties for Intelligent Flexible Sensors

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ADVANCED FUNCTIONAL MATERIALS 2025年第0期

作者： Wu, Meng Qiao, Chenyu Sui, peng-Fei Luo, Jing-Li Li, Zuoli Cao, Yi Pei, Renjun peng, xuwen Zeng, Hongbo Chinese Acad Sci Suzhou Inst Nanotech & Nanobion CAS Key Lab Nanobio Interface Suzhou 215123 Peoples R China Univ Alberta Dept Chem & Mat Engn Edmonton AB T6G 1H9 Canada Tsinghua Univ Dept Chem Engn Beijing 10084 Peoples R China

Hydrogels, which mimic the properties of natural tissues, are essential for flexible electronics in human-machine interfaces (HMIs). However, traditional hydrogels suffer from dehydration, compromising stability and functionality. To address this issue, a stratum corneum-inspired, water-retaining hydrogel is developed using hygroscopic polymers and bound water. Three types of hydrophilic monomers (non-ionic, mono-ionic, and zwitterionic) are explored, with polyzwitterions, particularly N,N-dimethyl (acrylamidopropyl) ammonium propane sulfonate (DMAAPS), forming a quasi-hydrogel that retains the softness and flexibility of conventional hydrogels. Water acts as a plasticizer, enhancing polymer chain mobility and reducing stiffness. The DMAAPS hydrogel maintains 100% weight retention under specific humidity conditions and shows skin-like softness across a wide humidity range. The Young's modulus increases from 54 to 118 kPa as relative humidity decreases from 80% to 40%. The absence of free water confers intrinsic anti-freezing properties. A triple crosslinking mechanism and conductive polymers endow the hydrogel with stretchability (> 2000%), toughness, elasticity, self-healing, and stable sensing capabilities. The hydrogel functions as an excellent flexible sensor for real-time, sensitive detection of human motion and physiological signals. An intelligent handwriting recognition platform with high accuracy is also established using double-channel signal collection and machine learning algorithms, offering insights for next-generation durable, biomimetic, and smart HMIs.

关键词： anti-freezing flexible sensors self-healing stratum corneum-inspired materials water retention wearable electronics Zwitterionic hydrogels

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Controlled Anodic Decomposition Pathway of Supramolecular Lithium Borate for Rationally Tuned Interphase Chemistry

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ANGEWANDTE CHEMIE-INTERNATIONAL EDITION 2025年第19期64卷 e202500425页

作者： Zhou, Haiyu Hou, Wenhui Zhu, Da Zhou, Pan peng, xuwen Liu, Zhi Yan, Shuaishuai Lu, Yang Ou, Yu Liu, Fengxiang Xia, Yingchun Liu, Hao Cao, Qingbin Song, Xuan Guo, Decai Xu, Hong Liu, Kai Tsinghua Univ Dept Chem Engn State Key Lab Chem Engn Beijing 100084 Peoples R China Tsinghua Univ Inst Nucl & New Energy Technol Beijing 100084 Peoples R China SINOPEC Dalian Res Inst Petr & Petrochem 96 Nankai RdTieshan St Dalian 116045 Liaoning Peoples R China

The rational tailoring and molecular-level engineering of stable cathode-electrolyte interphases (CEIs) is paramount to advancing the performance of next-generation high-energy, layered nickel-rich oxide-based lithium metal batteries. However, developing well-tailored electrolyte additives with rationally controlled interfacial chemistry remains highly challenging. Here, two lithium borates: lithium (2-methoxy-15-crown-5)trifluoroborate (C-LiMCFB) and lithium (15-methoxy-2,5,8,11,14-pentaoxahexadecan)trifluoroborate (L-LiMCFB), incorporating cyclic 15-crown-5 (15C5) and linear pentaethylene glycol monomethyl ether (PEGME) as respective host groups tethered to the boron center are designed and synthesized. In C-LiMCFB, the supramolecular polydentate chelation/de-chelation of the 15C5 with Li+ can sequentially deactivate/activate the anodic decomposition of the C & horbar;O bonds, therefore leading to the controlled cleavage pathway of B & horbar;O and C & horbar;O bonds. The controlled interfacial chemistry leads to the formation of a uniform CEI layer, rich in lithium boron-oxygen clusters interwoven with LiF, on the NCM811 surface. This novel CEI configuration demonstrates an exceptional balance of mechanical robustness, adhesiveness, and toughness, providing highly desirable protection for the NCM811 cathode. The discovery of these novel supramolecular boron-based lithium salts not only unlocks supramolecular chemistry for rational electrolyte tuning but also provides a deeper understanding of the CEI formation mechanism in high-energy lithium metal batteries.

关键词： Battery electrolytes Energy storage Lithium metal batteries Supramolecular chemistry

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Interphasial Chemistry Design for Seamless Lithium Deposition in Anode-Free Lithium Metal Batteries

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ADVANCED MATERIALS 2025年

作者： Song, Xuan Liu, Cheng Zhang, Aiyuan Ding, Li Zeng, Tianyou Lu, Yang Ou, Yu Hou, Wenhui Zhou, Pan Cao, Qingbin Yan, Shuaishuai Liu, Zhi peng, xuwen Zhou, Haiyu Xia, Yingchun Zhang, Weili Liu, Hao Liu, Kai Tsinghua Univ Dept Chem Engn Beijing 100084 Peoples R China China Acad Space Technol Beijing 100094 Peoples R China Beijing Mingyuan Space Elect Informat Technol Co L Beijing 100080 Peoples R China Tsinghua Univ Hefei Inst Publ Safety Res Hefei 230601 Peoples R China

Anode-free lithium metal batteries (AFLMBs) are promising due to ultrahigh energy density, reduced manufacturing costs, and enhanced safety through active lithium elimination. However, their practical implementation remains challenged by unstable electrode-electrolyte interfaces and the resulting rapid active species depletion. Herein, an ultrathin ion-conducting membrane (ICM) is designed, featuring uniformly distributed rigid benzenesulfonimide anionic groups and flexible lithiophilic groups containing ether oxygen groups. The constrained benzenesulfonimide anions enable exceptional charge separation and reduced spatial resistance, boosting lithium-ion mobility, while the integrated lithophilic network directs lateral lithium deposition through ionic nanochannels. This ICM layer effectively promotes the enrichment of anions at the interface and constructs stable anion-derived solid electrolyte interphases (SEI). Meanwhile, ICM layers with electron-insulating and ion-conducting properties can further prevent side reactions, and suppress dendritic Li growth acting as a natural shield, resulting in seamless lithium deposition. Specifically, the Li||Cu coin cells with ICM achieve 99.82% Coulombic efficiency. The AFLMBs assembled with ICM-coated copper foil (ICM Cu) and NCM811 deliver an energy density of 495 Wh kg-1 with 80.72% capacity retention after 100 cycles. The interphasial chemistry design strategy provides insights into the precise interfacial engineering to realize high-performance, high-safety battery systems and facilitates their development for practical applications.

关键词： anode-free lithium metal batteries dendrite suppression interphasial chemistry ion-conducting membranes solid electrolyte interphases

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Synergistic effects of asphaltenes, kaolinite, and water chemistry on oil-water emulsion stability

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Separation and Purification Technology 2025年 372卷

作者： Zhou, Qi Sun, Yongxiang Ma, Hongtao Song, Xuguang Huang, Pan Mao, Xiaohui peng, xuwen Zeng, Hongbo Department of Chemical and Materials Engineering University of Alberta EdmontonABT6G 1H9 Canada College of Materials Science and Engineering Donghua University 2999 North Renmin Road Shanghai201620 China Department of Chemical Engineering Tsinghua University Beijing100084 China

Effective treatment of emulsions formed during the bitumen extraction process is crucial for oil–water separation and subsequent processing. However, it remains a challenge in the oil sands industry due to the complex mixture of solids, water, and bitumen. Asphaltenes in bitumen and fine clay minerals in solids can significantly adsorb at interfaces and contribute to emulsion stability, which makes oil–water separation difficult. Very limited attention has been paid to the synergistic effects of asphaltenes, solids, and complex water chemistry involved in the bitumen extraction process. This study characterized asphaltenes and kaolinite, with kaolinite acting as a representative clay mineral in the experiments. The synergistic effects of asphaltenes and kaolinite fine particles on emulsion stability and interfacial properties were systematically investigated through demulsification bottle tests, zeta potential measurements, dynamic interfacial tension, and dilatational rheology analyses. The results suggest that kaolinite fine particles substantially enhance the stability of asphaltene-stabilized emulsions. Meanwhile, metal salts, especially divalent salts such as MgCl2 and CaCl2 in water, can further contribute to the stability of both asphaltene-stabilized emulsions and emulsions co-stabilized by asphaltenes and kaolinite. Computational insights from density functional theory and ab initio molecular dynamics elucidate the molecular-level interactions between asphaltenes, kaolinite, and metal cations. This work has improved the understanding of emulsion stability mechanisms posed by asphaltenes, clay minerals, and complex water chemistries in bitumen extraction and crude oil production. The results contribute to advancing separation and purification technologies critical to the oil sands industry. © 2025 The Authors

关键词： Asphalt mixtures

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Bio-inspired inorganic-protein coating on Mg-based biomaterials for bioengineering applications

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Science China Materials 2024年第5期67卷 1678-1680页

作者： xuwen peng Haolan Xu Department of Chemistry Engineering Tsinghua UniversityBeijing100084China Department of Chemical and Materials Engineering University of AlbertaEdmontonAlbertaT6G 1H9Canada Future Industries Institute UniSA STEMUniversity of South AustraliaMawson Lakes CampusAdelaideSouth Australia5095Australia

Developing smart and advanced functional materials inspired by the unparalleled complexity and efficiency of biological tissues has received much attention across various *** alloys,particularly pure magnesium,have emerged as notable candidates in orthopedics and dentistry due to their exceptional biocompatibility,degradability,and ability to promote bone regeneration[1].However,the highly reactive chemical nature of magnesium and its rapid degradation upon exposure to water.

关键词： coating alloys magnesium

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Multifunctional Hydrogels Integrated with Reversible Noncovalent Interactions for Bioengineering and Sensing Applications

Multifunctional Hydrogels Integrated with Reversible Noncova...

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作者： xuwen peng University of Alberta

学位级别：博士

Hydrogels bear a close resemblance to human tissues and thus have been extensively employed for a broad range of applications in recent years. Intelligent hydrogels that can respond to diverse stimuli, such as pH, temperature, ionic strength, strain and stress, hold great promise for a variety of biological engineering and sensing applications. Nevertheless, weak mechanical properties and narrow functionality have limited the application of traditional hydrogels generally based on permanent covalent bonds. Incorporating reversible noncovalent interactions within hydrogel networks is an effective approach that lifts those restrictions. In the context of the growing demand for bioengineering and sensing applications, it is of great significance yet remains a challenge to integrate multifunctionalities such as mechanical robustness, self-healing properties, stimuli-responsiveness and conductivity into one hydrogel through the introduction of reversible interactions, functional components and well-designed structures. In this thesis, a review of multifunctional hydrogels, non-covalent interactions and corresponding hydrogels, and bioengineering and sensing applications of hydrogels is presented first, followed by three original research projects investigating the integrated multifunctional hydrogels for different potential biomedical and electrical sensing applications. Hydrogels with good stretchability, high adhesiveness, sensitive electrical responsiveness, biocompatible and antibacterial features are exceptionally desirable materials for various biomedical and sensing applications. In the first project, we fabricated a highly stretchable, moldable, self-healing and antibacterial hydrogel with electrical responsiveness by introducing dynamic noncovalent interactions, i. e., hydrogen-bonding among hydroxyl groups of poly (vinyl alcohol) (PVA), carboxyl moieties of poly (methyl vinyl ether-alt-maleic acid) (PMVEMA), and the catechol groups in tannic acid (TA). The prep

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Probing and Manipulating Noncovalent Interactions in Functional Polymeric Systems

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CHEMICAL REVIEWS 2022年第18期122卷 14594-14678页

作者： Chen, Jingsi peng, Qiongyao peng, xuwen Zhang, Hao Zeng, Hongbo Univ Alberta Dept Chem & Mat Engn Edmonton AB T6G 1H9 Canada

Noncovalent interactions, which usually feature tunable strength, reversibility, and environmental adaptability, have been recognized as driving forces in a variety of biological and chemical processes, contributing to the recognition between molecules, the formation of molecule clusters, and the establishment of complex structures of macromolecules. The marriage of noncovalent interactions and conventional covalent polymers offers the systems novel mechanical, physicochemical, and biological properties, which are highly dependent on the binding mechanisms of the noncovalent interactions that can be illuminated via quantification. This review systematically discusses the nano mechanical characterization of typical noncovalent interactions in polymeric systems, mainly through direct force measurements at microscopic, nanoscopic, and molecular levels, which provide quantitative information (e.g., ranges, strengths, and dynamics) on the binding behaviors. The fundamental understandings of intermolecular and interfacial interactions are then correlated to the macroscopic performances of a series of noncovalently bonded polymers, whose functions (e.g., stimuli-responsiveness, self-healing capacity, universal adhesiveness) can be customized through the manipulation of the noncovalent interactions, providing insights into the rational design of advanced materials with applications in biomedical, energy, environmental, and other engineering fields.

关键词： Ligands Molecular mechanics Noncovalent interactions Polymers Surface interactions

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Bio-synthesis of palladium nanocubes and their electrocatalytic properties

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IET NANOBIOTECHNOLOGY 2018年第8期12卷 1031-1036页

作者： peng, xuwen Cui, Zelin Bai, Xuefeng Lv, Hongfei Heilongjiang Univ Sch Chem & Mat Sci Harbin 150080 Heilongjiang Peoples R China Heilongjiang Acad Sci Inst Petrochem Harbin 150040 Heilongjiang Peoples R China

The bio-synthesis of palladium nanocubes (PdNCs) was realised using pine needle extract as the reducing agent and cetyl trimethyl ammonium bromide as the capping agent. As an eco-friendly and readily available biomass, pine needle extract avoided the use of highly polluting chemical reducing agents. The growth process of PdNCs was analysed using ultraviolet-vis and Fourier transform infrared spectroscopy. Flavonoids, esters, terpenoids and polyhydric alcohols, which contain reductive groups, were mainly responsible for the transition of Pd2+ ions to PdNCs. The morphology and structure of PdNCs were characterised using transmission electron microscopy (TEM), high-resolution TEM, selected area electron diffraction and X-ray diffraction. It was indicated that the as-prepared PdNCs displayed a relatively high purity and good crystallinity with a face-centred cubic structure and exhibited sizes ranging from 6.11 to 29.51nm with an average particle size of 11.18nm. In the methanol electro-oxidation reaction, the PdNCs enclosed by {100} facets exhibited superior electro-catalytic activity to commercial Pd/C, which was rarely reported in other bio-synthesis processes for Pd catalysts. Meanwhile, the PdNCs showed excellent anti-poisoning ability and long-term stability. This study reveals the possibility of preparing shape-controlled PdNCs with a specific structure and excellent electro-catalytic activity.

关键词： transmission electron microscopy oxidation electron diffraction catalysts visible spectra reduction (chemical) catalysis palladium nanofabrication nanoparticles particle size ultraviolet spectra X-ray diffraction electrolysis Fourier transform infrared spectra organic compounds palladium nanocubes cetyl trimethyl ammonium bromide capping agent chemical reducing agents high-resolution TEM selected area electron diffraction biomass electrocatalytic properties pine needle extract ultraviolet-visible spectroscopy Fourier transform infrared spectroscopy flavonoids esters terpenoids polyhydric alcohols transmission electron microscopy X-ray diffraction face-centred cubic structure particle size methanol electrooxidation reaction biosynthesis processes catalysts antipoisoning ability long-term stability Pd

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Multiple current peaks and mode conversion of atmospheric pressure glow dielectric barrier discharge in helium

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THIN SOLID FILMS 2008年第21期516卷 7547-7554页

作者： Zhang, Yan Gu, Biao peng, xuwen Wang, Dezhen Wang, Wenchun Dalian Univ Technol State Key Lab Mat Modificat Laser Ion & Elect Bea Dalian 116024 Peoples R China Dalian Univ Technol Sch Phys & Optoelect Technol Dalian 116024 Peoples R China

Experimental research was performed on the multiple current peaks (MCP) in atmospheric pressure glow dielectric barrier discharge in helium. In a MCP discharge sequence, the next discharge pulse is always affected by the previous one. The accumulated charges on the dielectric plate play an important role in the MCP formation. In addition, two discharge modes, glow and Townsend discharge modes, can be observed in a MCP discharge sequence. The discharge mode tends to convert from glow to Townsend discharge mode when increasing the applied voltage, decreasing the gas gap and reducing driving frequency, respectively. (C) 2008 Elsevier B.V. All rights reserved.

关键词： glow dielectric barrier discharge multiple current peaks discharge mode atmospheric pressure

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