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Fluorinated poly(p-triphenylene isatin)anion exchange membranes based on hydrophilic hydroxyl side chain modulation for fuel cells

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Journal of Energy Chemistry 2025年第1期100卷 702-709页

作者： Yiman Gu Yanchao Zhang Zhanyu Li Yijia Lei Baozeng Sun Xiaoyu Yu Zhe Wang College of Chemistry and Life Science Changchun University of TechnologyChangchun 130012JilinChina College of Chemical Engineering Changchun University of TechnologyChangchun 130012JilinChina School of Materials Science and Engineering Changchun University of TechnologyChangchun 130012JilinChina Key Laboratory of Advanced Functional Polymer Membrane Materials of Jilin Province Changchun 130012JilinChina

The development of alkaline fuel cells is moving forward at an accelerated pace,and the application of ether-free bonded polymers to anion exchange membranes(AEMs)has been widely ***,the question of the“trade-off”between AEM ionic conductivity and dimensional stability remains *** strategy of inducing microphase separation to improve the performance of AEM has attracted much attention recently,but the design of optimal molecular structures is still being ***,this work introduced different ratios of 3-bromo-1,1,1-trifluoroacetone(x=40,50,and 60)into the main chain of poly(p-terphenylene isatin).Because fluorinated groups have excellent hydrophobicity,hydrophilic hydroxyl-containing side chains are introduced to jointly adjust the formation of phase separation *** results show that PTI-PTF_(50)-NOH AEM with the appropriate fluorinated group ratio has the best ionic conductivity and alkali stability under the combined effect of *** has an ionic conductivity of 133.83 mS cm^(-1)at 80°*** addition,the OH-conductivity remains at 89%of the initial value at 80°C and 3 M KOH for 1056 h of *** cell polarization curve based on PTI-PTF_(50)-NOH shows a power density of 734.76 mW cm^(-2)at a current density of 1807.7 mA cm^(-2).

关键词： Anion exchange membranes Poly(p-terphenylene isatin) Hydrophilic-hydrophobic phase separation Fluorinated group

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Encapsulating perovskite quantum dots into 3D COF for visible light-driven CO_(2) reduction

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science China Chemistry 2025年第4期68卷 1478-1485页

作者： Xinxin Wang Yucheng Jin Xiya Yang Qingyu Luan Tianyu Wang Dongdong Qi Kang Wang Jianzhuang Jiang College of Chemistry and Materials Science Anhui Normal UniversityWuhu 241002China Beijing Advanced Innovation Center for Materials Genome Engineering Beijing Key Laboratory for Science and Application of Functional Molecular and Crystalline MaterialsDepartment of Chemistry and Chemical EngineeringSchool of Chemistry and Biological EngineeringUniversity of Science and Technology BeijingBeijing 100083China

Lead halide perovskite quantum dots(LHP QDs)have been revealed to possess great potential in photocatalytic applications including CO_(2)reduction;which however suffer from poor ***;a high crystalline hydrazine-linked three-dimensional(3D)covalent organic framework;USTB-17;was fabricated from the reaction between 12-connected building block and 4-connected 3,5,7-tetrakis(4-aldophenyl)-***-modification with Ni^(2+) affords the metallic framework USTB-17(Ni)followed by sequential deposition of the CH_(3)NH_(2)PbI_(3)(MAPbI_(3))perovskite QDs into its pores;generating the USTB-17(Ni)@MAPbI_(3) *** X-ray diffraction analysis together with theoretical simulations and transmission electron microscopy discloses the crystalline nature of USTB-17;USTB-17(Ni);and USTB-17(Ni)@MAPbI_(3) with an unprecedented noninterpenetrated hpt *** close contact of QDs inside the COF pores with the Ni catalytic site locating at the pore surface of COF allows a rapid transfer of the photogenerated electrons in QDs to the Ni catalytic sites;enhancing the photocatalytic activity for CO_(2)*** endows USTB-17(Ni)@MAPbI_(3) with efficient photocatalysis performance for photocatalytic CO_(2)reduction with CO generation rate of 365μmol g^(-1)h^(-1)and CO selectivity up to 96%under visible-light irradiation;7 times higher than that of USTB-17(Ni).After four cycles of reactions;the photocatalytic CO generation rate remains almost unchanged;demonstrating its excellent cycle stability.

关键词： lead halide perovskite quantum dots 3D covalent organic frameworks hpt topology photocatalytic CO_(2)reduction

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Prediction of hydrogen storage in IL/COF composites based on high-throughput computational screening and machine learning

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International Journal of Hydrogen Energy 2025年 135卷 525-536页

作者： Cao, Zeming Liu, Yuan Wang, Zhaoxu Yang, Qingyuan Zheng, Baishu Key Laboratory of Theoretical Organic Chemistry and Functional Molecular Ministry of Education Laboratory of Controllable Preparation and Functional Application of Fine Polymers School of Chemistry and Chemical Engineering Hunan University of Science and Technology Hunan Xiangtan411201 China State Key Laboratory of Organic-Inorganic Composites Beijing University of Chemical Technology Beijing100029 China

Designing efficient adsorbent materials for hydrogen storage was highly desired because of the development of the hydrogen economy. Incorporation of ionic liquids (ILs) to COFs was an effective way to improve the performance of COF materials for gas storage and separation. In this work, a combination of high-throughput computational screening (HTCS) and machine learning (ML) were adopted to explore the potential of the IL/COF composites for H2 storage. Based on HTCS, the H2 adsorption capacity and the structural properties of IL/COF composites were assessed. Notably, these results revealed that the incorporation of ILs into COFs significantly improves H2 adsorption capacity and [MMIM][Cl]@JUC-564 was identified as a promising H2 storage material, which exhibits the highest H2 adsorption capacity of 51.5 mmol/g (10.3 wt%) at 298 K and 100 bar, outperforming COFs and MOFs reported in the literature. Furthermore, from a comparison of four ML algorithms (decision tree (DT), random forest (RF), categorical boosting (CatBoost) and extreme gradient boosting (XGBoost)), it was found that the CatBoost model has superior accuracy in predicting the H2 adsorption capacity. According to the feature engineering of the CatBoost model, it was shown that the accessible volume (Vpore), free volume (VF) and pore crystal density (ρ) of IL/COFs were the key features that affect the H2 adsorption property. The findings of this study will provide more powerful support for the design and synthesis of IL/COFs new composite materials. © 2025 Hydrogen Energy Publications LLC

关键词： Design for testability

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HfC–HfO_(2) modified high/superhigh temperature thermal protection coating for superior hot corrosion resistance and antioxidation performance

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Journal of advanced Ceramics 2025年第1期14卷 177-191页

作者： Zhiyun Ye Shuqi Wang Shuang Yu Xinrui Zhao Yongchun Zou Guoliang Chen Lei Wen Lina Zhao Guangxi Zhang Yaming Wang Jiahu Ouyang Dechang Jia Yu Zhou State Key Laboratory of Precision Welding&Joining of Materials and Structures Harbin Institute of TechnologyHarbin 150001China Institute for Advanced Ceramics Harbin Institute of TechnologyHarbin 150001China Key Laboratory of Advanced Structure-Function Integrated Materials and Green Manufacturing Technology Harbin Institute of TechnologyHarbin 150001China National Center for Materials Service Safety University of Science and Technology BeijingBeijing 100083China Xi’an Aerospace Composites Research Institute Academy of Aerospace Propulsion TechnologyXi’an 710025China

With advances in the thrust-weight ratio,the service temperature of gas turbine engines even exceeds 1500℃,which is urgent for the development of high/superhigh-temperature thermal protection systems(TPSs)for long-term *** alloys are increasingly viewed as promising structural materials for high-temperature applications because of their superior high-temperature mechanical strength,but the“pest”catastrophic oxidation greatly restricts their further *** this study,a HfC–HfO_(2)-modified silicide coating was prepared via an innovative method of halide-activated pack cementation(HAPC)combined with liquid-plasma-assisted particle deposition and sintering of niobium alloys,resulting in a composite coating with excellent hot corrosion resistance and high-temperature oxidation *** modified multilayer coating is characterized by the synergistic combination of a dense NbSi_(2) inner layer and a HfC–HfO_(2) porous outer layer,resulting in a significant improvement in high-temperature performance compared with that of the single NbSi_(2) *** corrosion gain of the composite coating is only 13.94 mg·cm^(−2) after a corrosion time of 200 h at 900℃,and an intact oxide scale surface is observed after oxidation at 1500℃for 500 *** improvement is attributed to the formation of a robust Hf-rich skeleton provided by the deposited HfC–HfO_(2) layer,which can accelerate the formation of a highly stable corroded layer/oxide *** addition,multiple stress release mechanisms of the composite coating at high temperatures also provide substantial contributions to long-term *** these merits make HfC–HfO_(2)-modified composite coatings on niobium alloys competitive for the development of high/superhigh-temperature thermal protection systems for long-term service.

关键词： thermal protection coating niobium alloys hot corrosion resistance high-temperature oxidation resistance stress release mechanism

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In situ construction of Cu(Ⅰ)-Cu(Ⅱ) pairs for efficient electrocatalytic nitrate reduction reaction to ammonia

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Journal of Energy Chemistry 2025年第1期100卷 106-113页

作者： Muyun Zheng Yuchi Wan Leping Yang Shen Ao Wangyang Fu Zhengjun Zhang Zheng-Hong Huang Tao Ling Feiyu Kang Ruitao Lv State Key Laboratory of New Ceramics and Fine Processing School of Materials Science and EngineeringTsinghua UniversityBeijing 100084China Institute of New Energy Materials and Engineering School of Materials Science and EngineeringFuzhou UniversityFuzhou 350108FujianChina Key Laboratory of Advanced Materials(MOE) School of Materials Science and EngineeringTsinghua UniversityBeijing 100084China Key Laboratory for Advanced Ceramics and Machining Technology of Ministry of Education Tianjin Key Laboratory of Composite and Functional MaterialsSchool of Materials Science and EngineeringTianjin UniversityTianjin 300072China

Electrocatalytic nitrate reduction reaction (NO_(3)-RR) to ammonia under ambient conditions is expected to be a green process for ammonia synthesis and alleviate water pollution *** report a CuO nanoparticles incorporated on nitrogen-doped porous carbon (CuO@NC) catalyst for NO_(3)-*** of Cu(Ⅱ) is reduced to Cu(Ⅰ) during the NO_(3)-RR process to construct Cu(Ⅰ)-Cu(Ⅱ) pairs,confirmed by in situ X-ray photoelectron spectroscopy (XPS) and Raman *** functional theory (DFT) calculations indicated that the formation of Cu(Ⅰ) could provide a reaction path with smaller energy barrier for NO_(3)-RR,while Cu(Ⅱ) effectively suppressed the competition of hydrogen evolution reaction (HER).As a result,CuO@NC catalyst achieved a Faradaic efficiency of 84.2% at -0.49 V versus reversible hydrogen electrode (RHE),and a NH_(3)yield rate of 17.2 mg h^(-1)mg^(-1)*** -0.79 V ***,higher than the HaberBosch process (<3.4 g h^(-1)g^(-1)cat.).This work may open a new avenue for effective NO_(3)-RR by modulating oxidation states.

关键词： Ammonia synthesis Cu oxidation state Electrochemistry Nitrate reduction In situ XPS

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Superconductivity in Cubic La_(3)Al with Interstitial Anionic Electrons

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Chinese Physics Letters 2025年第2期42卷 88-97页

作者： Zhijun Tu Peihan Sun Donghan Jia Huiyang Gou Kai Liu Hechang Lei School of Physics and Beijing Key Laboratory of Optoelectronic Functional Materials&MicroNano Devices Renmin University of ChinaBeijing 100872China Key Laboratory of Quantum State Construction and Manipulation(Ministry of Education) Renmin University of ChinaBeijing 100872China Department of Physics School of ScienceHebei University of Science and TechnologyShijiazhuang 050018China Center for High Pressure Science and Technology Advanced Research Beijing 100193China

We observed superconductivity in a cubic La_(3)Al single crystal that exhibits metallic behavior in the normal state without an observable structural transition and enters the superconducting state below T_(c)~6.32 *** characterization and analysis indicate that cubic La_(3)Al is a bulk type-Ⅱ BCS ***,theoretical calculations show that it can host interstitial anionic electrons located at the body center of the cubic unit cell,which confirms electron-phonon coupling as the superconducting ***,cubic La_(3)Al can be considered as a novel electride superconductor.

关键词： mechanism cubic

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From Coils to Crawls: A Snake-Inspired Soft Robot for Multimodal Locomotion and Grasping

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Nano-Micro Letters 2025年第1期17卷 1-16页

作者： Chen, He Chen, Zhong Liu, Zonglin Xiong, Jinhua Yan, Qian Fei, Teng Zhao, Xu Xue, Fuhua Zheng, Haowen Lian, Huanxin Chen, Yunxiang Xu, Liangliang Peng, Qingyu He, Xiaodong National Key Laboratory of Science and Technology On Advanced Composites in Special Environments Center for Composite Materials and Structures Harbin Institute of Technology Harbin150080 China Dongfang Electric Academy of Science and Technology Co. Ltd Chengdu611731 China Suzhou Research Institute of HIT Suzhou215104 China

Currently, numerous biomimetic robots inspired by natural biological systems have been developed. However, creating soft robots with versatile locomotion modes remains a significant challenge. Snakes, as invertebrate reptiles, exhibit diverse and powerful locomotion abilities, including prey constriction, sidewinding, accordion locomotion, and winding climbing, making them a focus of robotics research. In this study, we present a snake-inspired soft robot with an initial coiling structure, fabricated using MXene-cellulose nanofiber ink printed on pre-expanded polyethylene film through direct ink writing technology. The controllable fabrication of initial coiling structure soft robot (ICSBot) has been achieved through theoretical calculations and finite element analysis to predict and analyze the initial structure of ICSBot, and programmable ICSBot has been designed and fabricated. This robot functions as a coiling gripper capable of grasping objects with complex shapes under near infrared light stimulation. Additionally, it demonstrates multi-modal crawling locomotion in various environments, including confined spaces, unstructured terrains, and both inside and outside tubes. These results offer a novel strategy for designing and fabricating coiling-structured soft robots and highlight their potential applications in smart and multifunctional robotics. (Figure presented.) © The Author(s) 2025.

关键词： Programmable robots

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Distributed Monitoring of Internal Strain in Photosensitive Polymers Based on Self-Reference OFDR System

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Journal of Lightwave technology 2025年第10期43卷 4771-4777页

作者： Song, Zhuo Liang, Chaoping Zou, Dongjiang Chen, Hongdong Li, Songwei Lu, Hanglin Tang, Jian Shao, Laipeng Yang, Li Hu, Junhui Guangxi Normal University Guangxi Key Laboratory of Nuclear Physics and Technology College of Physics Science and Technology Guilin Guangxi541004 China Guangxi Normal University University Engineering Research Center of Advanced Functional Materials and intelligent sensing Guangxi Guangxi Key Laboratory of Nuclear Physics and Technology College of Physics Science and Technology Guilin Guangxi541004 China

Photosensitive polymers serve as critical adhesives in optical devices, with their thermal strain coefficient determining the performance of temperature-dependent loss in such devices. To accurately measure the true thermal strain coefficient of the adhesive, we proposed a measurement scheme of internal strain distribution in photosensitive polymers by using an optical frequency domain reflectometry (OFDR) system. In our scheme, a self-referencing approach is used to eliminate the temperature-to-strain crosstalk caused by temperature variations in the tested sample, thereby obtaining the true thermal strain coefficient of the tested sample. In our experiment, a 10 cm single-mode fiber (SMF) is embedded within the 2 mm × 2 mm × 100 mm photosensitive polymer, and we use the high spatial resolution of the OFDR system to realize the distributed strain measurements of the SMF. A thermal strain coefficient of 19.108 μϵ/°C is obtained when the temperature ranges from 30 °C to 120 °C. The temperature-to-strain crosstalk is 9.131 μϵ/°C, and the spatial resolution of the OFDR is 1.28 mm. In addition, we validated the stability of the entire experimental setup by conducting long-term measurements under fixed environmental conditions, during which the system fluctuations remained within approximately ± 3 GHz. The experimental results can provide valuable insights for the selection of adhesives and the determination of optimal curing time of the passive optical devices fabrication in the field of optical fiber communication. 2025 IEEE. All rights reserved.

关键词： Single mode fibers

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Stepwise activated probe for cell surface glycan imaging

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science China Chemistry 2025年

作者： Chunyi Zhang Jing Chen Xiaoyao Bai Shengnan Fu Xin Su State Key Laboratory of Organic-Inorganic Composites Beijing Key Laboratory of Bioprocess Beijing Advanced Innovation Center for Soft Matter Science and Engineering College of Life Science and Technology Beijing University of Chemical Technology

Fluorescent DNA probes commonly used for in situ imaging of cell surface glycans are “always-on” probes(AOPs), which produce high background noise and lack spatial specificity. Molecular dynamics simulations indicate that single-stranded DNA(ssDNA) can stably associate with the cell membrane, contributing to persistent background signals in AOPs. To overcome this challenge, a stepwise activated probe(SAP) is developed for in situ imaging of cell surface glycans. In SAP, the cell surface glycan is labeled by rolling circle amplification product through metabolic glycan labeling strategies. The product hybridizes a fluorophore and quencher-labeled ssDNA reporter to form a double strand producing primary enhancement of fluorescence signal. Nicking enzyme(***) cleaves the double strand and releases the quencher, further enhancing the signal. Nonspecific absorption of the reporter on the cellular membrane does not increase the fluorophore-quencher distance in SAP or trigger *** cleavage. As a result, only the glycan sites are illuminated. SAP not only exhibits high imaging specificity but also greatly simplifies the imaging procedure by reducing the washing steps. SAP offers a considerable improvement in detection specificity and sensitivity by employing a two-step activation and amplification process, making it a powerful method for in situ fluorescence imaging.

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Synergistic enhancement of alkaline hydrogen evolution reaction by role of Ni-Fe LDH introducing frustrated Lewis pairs via vacancy-engineered

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Chinese Chemical Letters 2025年第3期36卷 512-516页

作者： Mianfeng Li Haozhi Wang Zijun Yang Zexiang Yin Yuan Liu Yingmei Bian Yang Wang Xuerong Zheng Yida Deng State Key Laboratory of Marine Resource Utilization in South China Sea School of Materials Science and EngineeringHainan UniversityHaikou 570228China Tianjin Key Laboratory of Composite and Functional Materials Key Laboratory of Advanced Ceramics and Machining Technology(Ministry of Education)School of Materials Science and EngineeringTianjin UniversityTianjin 300072China

The alkaline hydrogen evolution reaction(HER)is a crucial process for sustainable hydrogen production,yet it requires efficient and stable electrocatalysts to overcome the high activation energy *** article discusses a novel strategy for enhancing the performance of Ni-Fe layered double hydroxide(Ni-Fe LDH)in the alkaline HER by modifying it with a frustrated Lewis acid-base pair(FLP)constructed through vacancy *** study found that the modified Ni-Fe LDH exhibited improved alkaline HER *** functional theory(DFT)calculations demonstrate that the introduction of FLP can activate water and protons more efficiently than monometallic sites,thus reducing the alkaline HER energy barrier and *** HER under alkaline conditions,the Volmer step involves an additional hydrolysis dissociation compared to acidic conditions,which is one of the factors contributing to the slow reaction *** paper demonstrates that FLPs can alter the rate-determining step in alkaline HER from the Volmer step to a step with a lower energy barrier,more suitable for hydrogen *** work provides new insights into the role of FLPs in regulating the mechanism and kinetics of HER and opens a new direction for the design and optimization of LDH-based and other electrocatalysts.

关键词： Ni-Fe LDH Frustrated Lewis acid-base pair Density functional theory The ab initio molecular dynamics The alkaline hydrogen evolution reaction

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