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Design of stable covalent organic frameworks for transport regulation of mass and energy

science China Chemistry 2023年第12期66卷 3495-3505页

作者： Xianzhe Wei Cheng Gu State Key Laboratory of Luminescent Materials and Devices Institute of Polymer Optoelectronic Materials and DevicesSouth China University of TechnologyGuangzhou 510640China College of Polymer Science and Engineering State Key Laboratory of Polymer Materials EngineeringSichuan UniversityChengdu 610065China

This feature article discusses the design of stable covalent organic frameworks(COFs) for the transport regulation of protons,electrons, and radicals. Transporting these particles through materials is essential for many applications, and porous materials with high surface area and porosity have become powerful platforms for their development. However, the stability of the holes in the material is crucial for adjusting the transmission performance, which may change significantly when the material is not stable enough, and the structure changes when it is in service in the environment. Various strategies have been adopted to improve the stability of COFs, including introducing strong electron-donating groups into the COFs and introducing irreversible reactions into the COF synthesis process. The transport regulation in stable COFs has been explored, and the structure-function relationship has been established. The prospects and challenges of COFs for the transport regulation of protons, electrons, and radicals have also been discussed. Overall, the breakthroughs in COF field have opened new possibilities for developing advanced materials with improved transport properties. The stable COFs have potential applications in energy storage, catalysis,and sensing. However, further research is needed to understand the transport properties of COFs fully and to optimize their performance for specific applications.

关键词： covalent organic frameworks transport regulation stability

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Facile fabrication of densely packed ammoniated alumina/MXene/bacterial cellulose composite films for enhancing thermal conductivity and photothermal conversion performance

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材料科学技术（英文版） 2025年第10期213卷 162-173页

作者： Chouxuan Wang Zhongguo Zhao Shengtai Zhou Lei Wang Xinyue Liu Rong Xue National and Local Engineering Laboratory for Slag Comprehensive Utilization and Environment Technology School of Materials Science and EngineeringShaanxi University of TechnologyHanzhong 723000PR China The State Key Laboratory of Polymer Materials Engineering Polymer Research Institute of Sichuan UniversityChengdu 610065PR China

The full arrival of 5 G and advances in electronic integration make efficient heat dissipation crucial for stable operation and longer product *** this study,a vacuum-assisted filtration process was employed to fabricate ammoniated alumina/MXene/bacterial cellulose(Al2O3-NH2/MXene/BC)composite films that display a unique integration of properties,encompassing ultra-high thermal conductivity(λ),mechanical flexibility,and high photothermal conversion *** leveraging the bridging effect among spherical Al2O3-NH2 and MXene nanosheets,a densely packed"point-surface"structure was con-structed in BC by using a one-step preparation *** the mass fraction of Al2O3-NH2/MXene(1∶3,w/w)is 40 wt％,the O-BAl1M3 exhibited an in-plane λ of 20.02 W m-1 K-1,which was 436％and 94％higher than that of pure BC and T-BAl1M3(prepared by a two-step method),***-more,constructing an intact thermal conductive network within BC notably promoted photothermal and photoelectric conversion *** maximum surface temperature and voltage of the O-BAl1M3 film reached 106.9 ℃ and 48.34 mV when a sample with an area of 1.56 cm2 was exposed under a light intensity of 200 mW *** applying O-BAl1M3 film,the temperature inside a self-built greenhouse model reached up to 64.8 ℃ within 1200 s under a light intensity of 100 mW cm-2,which validated the practical application of the composite films and offered a novel approach for creating flexible films with superior photothermal conversion *** work provided insights into preparing functional composite films for efficient thermal management and photothermal conversion applications.

关键词： MXene Bacterial cellulose Composite film Thermal conductivity Photothermal conversion

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Preparation, interfacial regulation and strengthening of Mg/Al bimetal fabricated by compound casting: A review

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Journal of Magnesium and Alloys 2023年第9期11卷 3059-3098页

作者： Guangyu Li Wenming Jiang Feng Guan Zheng Zhang Junlong Wang Yang Yu Zitian Fan State Key Laboratory of Materials Processing and Die&Mould Technology School of Materials Science and EngineeringHuazhong University of Science and TechnologyWuhan 430074China

Mg/Al bimetal combines the advantages of both aluminum and magnesium and has broad application prospects in automotive, aerospace,weapons, digital products and so on. The compound casting has the characteristics of low cost, easy to achieve metallurgical combination and suitable for the preparation of complex bimetallic parts. However, bimetallic joint strength is low due to differences of physical properties between Al and Mg, oxide film on metallic surface and interfacial Al-Mg IMCs, which is closely related to the interfacial microstructure and properties. Therefore, how to control the interface of the bimetal to achieve performance enhancement is the focus and difficulty in this field. At present, there are mainly the following strengthening methods. First, the “zincate galvanizing” and “electrolytic polishing+anodic oxidation” technology were exert on the surface of Al alloy to remove and break the oxide film, which improved the wettability between Al and Mg. Second, the undesirable Al-Mg IMCs were reduce or elimination by adding the interlayers(Zn, Ni and Ni-Cu). Thirdly, the evolution process of interfacial microstructure was changed and fine strengthening phases were formed by adding Si element to Al alloy or rare earth element to Mg alloy. Fourthly, mechanical vibration and ultrasonic vibration were applied in the process of the filling and solidification to refine and homogenize the interfacial structure. Finally, some other methods, including secondary rolling, thermal modification, heat treatment and constructing exterior 3D morphology, also can be used to regulate the interfacial microstructure and compositions. The above strengthening methods can be used alone or in combination to achieve bimetallic strengthening. Finally, the future development direction of the Mg/Al bimetal is prospected, which provides some new ideas for the development and application of the Mg/Al bimetal.

关键词： Mg/Al bimetal Preparation Compound casting Interfacial regulation Interface strengthening Research progress

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Simultaneous enhancement of red luminescence and thermal stability of a novel red phosphor:A Li^(+)-Eu^(3+)co-occupied site strategy in BaAl_(2)Ge_(2)O_(8)lattices

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Journal of Rare Earths 2024年第10期42卷 1846-1854页

作者： Wei Zhang Changjian Wang Xusheng Qiao Xianping Fan State Key Laboratory of Silicon Materials School of Materials Science and EngineeringZhejiang UniversityHangzhou310027China Ocean Academy Zhejiang UniversityZhoushan316021China

The rapid development of phosphor-converted white light emitting diodes(pc-WLEDs)requires new red phosphors with efficient and thermally stable luminescence for high-quality warm-white ***,it is still a challenge to discover red phosphors with facile synthesis,high internal quantum efficiency(IQE),excellent thermal stability and high color ***,a novel red-emitting Eu^(3+)activated barium dialuminum digermanate(BaAl_(2)Ge_(3)O_(8),EAGO)phosphor showing strong red emission at 610 nm was *** IQE is improved from 32.91%to 78.84%by employing a charge compensation *** lithium-ion co-dop ed BAGO:Eu^(3+)phosphor exhibits a nearly twofold increase in integral photoluminescence(PL)intensity and the high color purity reaches 94.17%.Impressively,the PL intensity of the BAGO:Eu^(3+),Li^(+)phosphor drops by only 2.6%at 150℃of that at room ***,the pc-WLED using the red BAGO:Eu^(3+),Li^(+)phosphor exhibits white light with the chromaticity coordinate of(0.3515,0.3495),a high color-rendering index of 92 and a low correlated color temperature of 4746 *** these results manifest that BAGO:Eu^(3+),Li^(+)phosphor is a suitable red phosphor for nearultraviolet(NUV)chip-based pc-WLEDs.

关键词： BaAl_(2)Ge_(2)O_(8):Eu^(3+) Red phosphor Charge compensation High quantum efficiency Excellent thermal stability Rare earths

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Suppression of the Kelvin-Helmholtz instability by coating in the double-cone ignition scheme

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Chinese Physics B 2024年第12期33卷 333-340页

作者： Yuan-Kai Xie Cheng-Long Zhang Yi-Zhen Cheng Ying-Jun Li School of Science China University of Mining and TechnologyBeijing 100083China State Key Laboratory for Tunnel Engineering China University of Mining and TechnologyBeijing 100083China

In order to address the issue of gold mixing caused by the Kelvin-Helmholtz instability(KHI)in the double-cone ignition(DCI)scheme,we investigate the growth rate of the KHI at the bi-interface of the DCI scheme after applying a *** is done by solving the hydrodynamic equations for an ideal incompressible fluid using linear ***,it is discovered that applying a coating with a thickness slightly above h=0.5(λ+10μm)and a density somewhat lower than that of the target layer can effectively reduce the growth rate of interfacial *** work provides theoretical references for studying the bi-interface KHI in the DCI scheme.

关键词： coating Kelvin-Helmholtz instability double-cone ignition scheme growth rate

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Functionalization of covalent organic frameworks via multicomponent reactions

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science China Chemistry 2024年第12期67卷 3906-3914页

作者： Xue-Hui Liu Peng-Lai Wang Wei Wang San-Yuan Ding State Key Laboratory of Applied Organic Chemistry College of Chemistry and Chemical EngineeringMOE Frontiers Science Center for Rare IsotopesLanzhou UniversityLanzhou 730000China

Functionalized covalent organic frameworks(COFs)represent a fascinating class of porous materials that have attracted widespread interest due to their modifiable structures and impressive potential ***,the construction of functionalized COFs remains difficult as it requires simultaneous consideration of robust linkages,diversified structures,and tailorable ***,the introduction of multicomponent reactions(MCRs)into COF synthesis opens new avenues for creating highly stable and function-oriented COF materials,marking a significant advance in the development of *** minireview summarizes the types of MCRs used in COF synthesis,highlights the functionalization strategies of COFs via MCRs,and provides insights on the key challenges and future frontiers in this field.

关键词： covalent organic frameworks multicomponent reactions functionalization strategies

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Tuning active sites in MoS_(2)-based catalysts via H_(2)O_(2)etching to enhance hydrodesulfurization performance

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Petroleum science 2023年第6期20卷 3875-3886页

作者： Shui-Sen He Ting-Ting Huang Chao Chen Yu Fan State Key Laboratory of Heavy Oil Processing China University of PetroleumBeijing102249China State Key Laboratory Base for Eco-Chemical Engineering in College of Chemical Engineering Qingdao University of Science and TechnologyZhengzhou Road 53Qingdao266042ShandongChina

A H_(2)O_(2)etching strategy was adopted to introduce coordinatively unsaturated sites(CUS)on MoS_(2)-based catalysts for dibenzothiophene(DBT)hydrodesulfurization(HDS).The CUS concentrations on MoS_(2) slabs were finely regulated by changing the concentrations of H_(2)O_(2)*** the increasing H_(2)O_(2)concentrations(0.1–0.3 mol/L),The CUS concentrations on MoS_(2) slabs increased ***,the high-concentration H_(2)O_(2)etching(0.5 mol/L)increased the MoOxSy and MoO_(3) contents on MoS_(2) slabs compared to etching with the H_(2)O_(2)concentration of 0.3 mol/L,which led to the less CUS concentration in the sulfided Mo–H-0.5 catalyst than in the sulfided Mo–H-0.3 catalyst.A microstructure-activity correlation indicated that the CUS introduced by H_(2)O_(2)etching on MoS_(2) slabs significantly enhanced DBT *** Co loadings were further introduced into Mo–H-0.3,which had the most CUS concentration,and the corresponding 0.2-CoMo catalyst with the highest CoMoS content(3.853 wt%)exhibited the highest reaction rate constant of 6.95×10^(−6)mol g^(−1)s^(−1)among these CoMo catalysts.

关键词： H_(2)O_(2)etching Coordinatively unsaturated site concentrations CoMoS Hydrodesulfurization

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Tungsten-substituted zeolite-regulated unsaturated cobalt atoms for robust light alkane dehydrogenation

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Journal of Energy Chemistry 2025年第4期103卷 525-534页

作者： Xichen Yin Tianjun Zhang Yanhang Ma Qiming Sun Innovation Center for Chemical Science College of ChemistryChemical Engineering and Materials ScienceJiangsu Key Laboratory of Advanced Negative Carbon TechnologiesSoochow UniversitySuzhou 215123JiangsuChina Shanghai Key Laboratory of High-resolution Electron Microscopy&School of Physical Science and Technology ShanghaiTech UniversityShanghai 201210China State Key Laboratory of New Pharmaceutical Preparations and Excipients College of Chemistry and Materials ScienceHebei UniversityBaoding 071002HebeiChina

The dehydrogenation of alkanes has emerged as a vital complementary process to address the increasing global demand for olefins.A key challenge remains in the construction of novel active centers that offer superior activity,stability,and ***,tricoordinated cobalt atoms were successfully fabricated through an in-situ ligand-protected synthesis by introducing tungsten atoms into zeolite *** unsaturated Co species efficiently activate C-H bonds while suppressing C-C bond cleavage,resulting in exceptional catalytic activity and olefin selectivity in both propane and ethane dehydrogenation *** optimized Co_(0.2%)@0.01W-S-1 catalyst demonstrated an impressive propylene formation rate of 15.2 molC_(3H6)gcC h^(-1)at 823 K and an ethylene formation rate of 240.3mol_(C2H4)g_(Co)^(-1)h^(-1)at 913 K,with propylene and ethylene selectivities of 99.0%and 97.5%,*** results not only significantly surpass conventional tetracoordinated Co catalysts but also rival some Pt-based catalysts under similar ***,the catalyst exhibited excellent stability in dehydrogenation reactions,with no significant loss in catalytic activity after five consecutive regeneration *** work offers valuable insights into the design of zeolite-supported non-precious metal catalysts with high activity and durability for efficient alkane dehydrogenation.

关键词： Tungsten-substituted zeolite Tricoordinated cobalt Propane dehydrogenation Ethane dehydrogenation Heterogeneous catalysis

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Improving efficiency of n–i–p perovskite solar cells enabled by 3-carboxyphenylboronic acid additive

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Chinese Physics B 2023年第10期32卷 666-671页

作者：李斌杰李嘉文杨根杰吴梦鸽于军胜 State Key Laboratory of Electronic Thin Films and Integrated Devices School of Optoelectronic Science and EngineeringUniversity of Electronic Science and Technology of ChinaChengdu 610054China

In the past period of time, perovskite solar cells have gained tremendous developments in improving photovoltaic performance, but they still face severe challenges. Defects in perovskite layers, especially at grain boundaries, severely limit the stabilization and efficiency of solar cells. In this work, we adopt 3-carboxyphenylboronic acid(CPBA) for modifying defects in perovskite thin films. Through the interaction among the carboxyl group, boronic acid and lead ions in the perovskite film, the crystallization effect of the perovskite molecular is greatly optimized. Moreover, the film defects are spontaneously passivated and the band gap is reduced, increasing the open circuit voltage and fill factor. Therefore,power conversion efficiency has been increased from 17.25% to 20.20%. This discovery provides a potential strategy for passivating the trap states in perovskite and enhancing the properties of devices.

关键词： passivation defects 3-carboxyphenylboronic acid perovskite solar cells

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Optimal regulation of flexible loads in rural residential buildings considering mobile batteries:A case study in Shaanxi Province

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Building Simulation 2024年第7期17卷 1065-1083页

作者： Xi Luo Wence Shi School of Building Services Science and Engineering Xi'an University of Architecture and Technology(XAUAT)Xi'an 710055China State Key Laboratory of Green Building Xi'an 710055China

While the grid-connected capacity of rural household photovoltaics is increasing rapidly,achieving dynamic supply-demand matching despite fluctuations in solar energy is *** the rapid development of rural electrification,battery-powered technologies,such as electric vehicles and electric agricultural machinery,are becoming increasingly popular in rural *** this context,utilizing idle mobile batteries to assist in energy storage for rural residential buildings offers a new way to solve the problem of dynamic supply-demand *** this study,a field survey was conducted on several typical fruit-growing villages in the Central Shaanxi Plain in Shaanxi Province of *** rural households were selected to calculate the electricity loads of the residential buildings,with due consideration to the intervention of mobile *** the premise of installing 3 kW household photovoltaic systems in rural households,an economical efficiency-oriented model was built for the optimal regulation of flexible *** results were compared in the context of two patterns of electricity consumption,i.e.,unidirectional charging of mobile batteries from buildings and bidirectional charging and discharging between mobile batteries and *** bidirectional pattern significantly increased the photovoltaic consumption of typical rural households on various typical ***,during both scenarios of not implementing time-of-use and implementing time-of-use,the typical day of the winter slack farming season exhibited the best photovoltaic consumption effect among all types of typical ***,the bidirectional pattern also result in a significant increase in the annual electricity sales revenues for typical rural households.

关键词： demand-side response flexible load mobile battery household photovoltaics

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