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MOF-derived nitrogen-doped core-shell hierarchical porous carbon confining selenium for advanced lithium-selenium batteries

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Nanoscale 2019年第14期11卷 6970-6981页

作者： Jian-Ping Song Liang Wu Wen-Da Dong Chao-Fan Li Li-Hua Chen Xin Dai Chao Li Hao Chen Wei Zou Wen-Bei Yu Zhi-Yi Hu Jing Liu Hong-En Wang Yu Li Bao-Lian Su State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology 122 Luoshi Road 430070 Wuhan Hubei China. chenlihua@*** yu.li@***.

The lithium-selenium (Li-Se) battery has attracted growing interest recently due to its high energy density and theoretical capacity. However, the shuttle effect and volume change during cycling severely hinder its further application. In this work, we report a metal-organic framework (MOF)-derived nitrogen-doped core-shell hierarchical porous carbon (N-CSHPC) with interconnected meso/micropores to effectively confine Se for high-performance Li-Se batteries. The micropores were located at the ZIF-8-derived core and the ZIF-67-derived shell, while mesopores appeared at the core-shell interface after the pyrolysis of the core-shell ZIF-8@ZIF-67 precursor. Such a special hierarchical porous structure effectively confined selenium and polyselenides to prevent their dissolution from the pores and also alleviated the volume change. In particular, in situ nitrogen doping, which afforded N-CSHPC, not only improved the electrical conductivity of Se but also provided strong chemical adsorption on Li2Se, as confirmed by density functional theory calculations. On the basis of dual-physical confinement and strong chemisorption, Se/N-CSHPC-II (molar ratio of Co source to Zn source of 1.0 in the core-shell ZIF-8@ZIF-67 precursor) exhibited reversible capacities of up to 555 mA h g-1 after 150 cycles at 0.2 C and 462 mA h g-1 after 200 cycles at 0.5 C and even a discharge capacity of 432 mA h g-1 after 200 cycles at 1 C. Our demonstration here suggests that the carefully designed Se/C composite can improve the reversible capacity and cycling stability of Se cathodes for Li-Se batteries.

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Influence of high-voltage argon ion bombardment on the adhesion and friction properties of GLC coatings and its application in friction and noise reduction for heavy-load gears

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Surface and Coatings technology 2025年 512卷

作者： Jinke Yu Shubing Hu Shasha Quan Xiaoguang Fan Junping Zhao Jiyuan Liu Hong Ya Li Yixuan Huang Yefei Chen State Key Laboratory of Material Processing and Die & Mould Technology School of Materials Science and Engineering Huazhong University of Science and Technology Wuhan 430074 China Hubei University of Automotive Technology Shiyan 442002 China Dong Feng Commercial Vehicle Technical Center DongFeng Commercial Vehicle Co. LTD Wuhan 430056 China

In this study, polished and shot-peened carburized substrates, pretreated with high-voltage argon ion bombardment (2800 V), were then coated using the physical vapor deposition method at bias voltages of −40 V, −60 V, and − 80 V. The microstructure and mechanical properties of the coating were analyzed. The results showed the adhesion strength of polished substrates initially increases with increasing bias voltage and then decreases, the coating prepared at a bias voltage of −60 V exhibited superior wear resistance and the best performance, with adhesion strengths of 93.4 N for polished substrate and 65.7 N for shot-peened substrate. However, when high-voltage argon ion bombardment was removed, the adhesion strength significantly declined. The interface analysis between the substrate and the Cr interlayer revealed that the absence of argon ion bombardment resulted in an amorphous layer formed at the interface, which weakened the adhesion between the substrate and the Cr layer. In contrast, after argon ion bombardment, the amorphous Cr layer disappeared, and a semi-coherent interface was formed between the substrate and the Cr interlayer, resulting in enhanced adhesion. Additionally, the argon ion bombardment activated the substrate surface, increasing the nucleation rate, thickness, and growth uniformity of the Cr layer, thereby providing a robust foundation for subsequent coating growth. As a result, the coating exhibited fewer internal defects and superior comprehensive performance. The optimal coating was applied to the gears in a heavily loaded 14-speed gearbox, and the results showed that coating could effectively help to reduce noise, improve transmission efficiency, prevent pitting, thereby extending gear lifespan.

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Microcracks self-healing: A novel strategy to enhance oxidation and cracking resistance in SiCf/SiC-GH536 brazed joints

Transactions of Materials Research

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Transactions of materials Research 2025年第2期1卷

作者： Shuai Zhao Pengcheng Wang Haiyan Chen Zhaoyi Pan Yongsheng Liu Wenya Li School of Materials Science and Engineering State Key Laboratory of Solidification Processing Northwestern Polytechnical University Xi'an 710072 China Shaanxi Key Laboratory of Friction Welding Technologies Northwestern Polytechnical University Xi'an 710072 China Xi'an Space Engine Company Limited Xi'an 710072 China Aerospace Science and Technology Corporation Xi'an 710072 China

This study presents a novel approach for enhancing the crack self-healing behavior of SiC f /SiC–GH536 brazed joints under high-temperature conditions by introducing Er 2 Si 2 O 7 + MoSi 2 composite sealing coatings at the brazing seam. The key innovation lies in the development of a self-healing mechanism that not only improves the oxidation resistance of SiC f /SiC composites but also actively repairs microcracks during service. The Er 2 Si 2 O 7 + MoSi 2 sealing coating was fabricated via hot-press sintering, and its microstructure and phase composition were systematically characterized. After annealing at 1000 °C for 1 h in air, cracks in the coating were nearly completely healed, accompanied by a 5.89 % volume expansion of the healing phases, which effectively impeded further crack propagation. Moreover, the shear strength of the coated brazed joint reached 54.7 MPa, representing a 35.7 % improvement compared to joints without the coating. The self-healing mechanism consists of two sequential processes: the oxidation of MoSi 2 to form SiO 2 , which infiltrates and fills the cracks, followed by the reaction between SiO 2 and Er 2 SiO 5 to form Er 2 Si 2 O 7 , generating compressive stress that promotes crack closure and enhances joint integrity. This work provides a theoretical foundation for the design of high-performance brazed joints and introduces a promising strategy to improve the reliability and service life of ceramic–metal composite joints through active crack repair under high-temperature oxidative environments.

关键词： High entropy alloy Brazing SiC f /SiC Sealing coating Crack self-healing

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Multi-layer graphene nanosheets bridging binary aluminium oxide for the synergistic enhancement of thermal conductivity and electrical insulation of silicone resin composite

Electrical Materials and Applications

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Electrical materials and Applications 2024年第2期1卷

作者： Yutan Shen Shikun Li Bing Qin Chong Zhang Wenpeng Li Bo Wang Zhanwei Zhu Chang Liu SINOPEC Research Institute of Petroleum Processing Co. Ltd. Beijing China State Key Laboratory of Advanced Power Transmission Technology (State Grid Smart Grid Research Institute Co. Ltd.) Beijing China State Grid Beijing Electric Power Company Beijing China

The flexible polymer composites usually require high intrinsic thermal conductivity fillers for the applications in thermal management, such as the well-known graphene, which can, in turn, compromise their electrical insulation properties. Here, the authors developed the silicone resin (SR) composites filled with multi-layer graphene nanosheets (MGN) and binary alumina (Al 2 O 3 ), and the microstructure of composites exhibits the dominant skeleton of large-sized Al 2 O 3 filler and branching of small-sized Al 2 O 3 fillers features by the size matching effect of optimal binary Al 2 O 3 . The introduction of supplementary MGN fillers further increases the face-to-face contact probability and bridges the isolated binary Al 2 O 3 , which contributes to the high thermal conductivity of 3.0 W·m −1 ·K −1 under these synergistic effects. The dense and connected ‘Al 2 O 3 -MGN-Al 2 O 3 ’ thermal conductive pathway is successfully built, as supported by the numerical simulation and Agari model fitting. Meanwhile, the electrical conductivity caused by MGN can be blocked by the surrounding insulation Al 2 O 3 filler network, exhibiting a high volume resistivity of 1.7 × 10 15 Ω · cm. Moreover, the Al 2 O 3 /MGN/SR composite films effectively transfer the heat and diminish the hot-spot temperature by 53.5°C in cooling light emitting diode chip module application.

关键词： binary Al2O3 electrical insulation multi-layer graphene polymer composites thermal conductivity

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TiO 2 -rGO-Cu complex: A photocatalyst possessing an interfacial electron transport mechanism to enhance hydrogen production from seawater

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Chemical Physics Letters 2023年 822卷

作者： Lei Xia Yi Lu Yuan-Zhou Li Zhi-Yi Hu Xiao-Yu Yang State Key Laboratory of Advanced Technology for Materials Synthesis and Processing & School of Materials Science and Engineering Wuhan University of Technology 122 Luoshi Road Wuhan 430070 China Nanostructure Research Centre (NRC) Wuhan University of Technology 122 Luoshi Road 430070 Wuhan Hubei China Institut für Anorganische Chemie und Strukturchemie Heinrich-Heine-Universität Düsseldorf Universitätsstraße 1 Düsseldorf 40225 Germany

Photocatalytic hydrogen production from seawater has great prospects for generating clean energy from renewable resources. We designed a TiO 2 -rGO-Cu photocatalyst that possesses a pathway for directed electron transfer from nitrogen-doped TiO 2 to rGO and then to Cu nanoparticles, which leads to efficient electron-hole pairs separation. Results show that TiO 2 -rGO-Cu has a hydrogen production rate of 16.08 mmol h −1 g −1 in simulated seawater, which is as much as 25 times higher than that of TiO 2 . The mechanism for a highly efficient directional interfacial electron transport is proposed. The strategy could be effective for designing new photocatalysts for hydrogen production from seawater.

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Electron induction of atomically dispersed Fe sites by adjacent Te atoms promotes CO₂ activation in electroreduction

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Chem Catalysis 2023年第6期3卷

作者： Pan, Yuan Liu, Chuhao Zhang, Nannan Li, Min Wang, Minmin Yang, Xuan Chen, Hsiao-Chien Zhang, Yanhui Hu, Wei Yan, Wensheng Chen, Hao Ming Liu, Shoujie Xiao, Hai Li, Jun Chen, Chen State Key Laboratory of Heavy Oil Processing China University of Petroleum (East China) Qingdao 266580 China Department of Chemistry Tsinghua University Beijing 100084 China College of Chemistry and Molecular Engineering Peking University Beijing 100871 China School of Chemistry and Chemical Engineering Huazhong University of Science and Technology Wuhan 430074 China Center for Reliability Sciences and Technologies Chang Gung University Taoyuan 33302 Taiwan School of Materials Science and Engineering Key Laboratory for Anisotropy and Texture of Materials Ministry of Education Northeastern University Shenyang 110819 China National Synchrotron Radiation Laboratory University of Science and Technology of China Anhui Hefei 230029 China Department of Chemistry National Taiwan University Taipei 106 Taiwan School of Materials Science and Engineering Anhui University Hefei 230601 China

We report an electron induction regulation mechanism of single-atomic Fe sites by adjacent Te atoms to construct Fe–Te diatomic sites (DASs) for synergistic electrocatalytic CO₂ reduction reaction (CO₂RR). The Fe–Te DASs feature stable and unique N₃Fe–TeC₃ structures, with low-valence Fe^δ+ binding with one C atom and one O atom of CO₂, and the adjacent Te^δ+ acts as an electron donor, adjusting the electronic structure of Fe^δ+ sites, and stabilizes another negative O atom of CO₂ by favorable electrostatics, strengthening CO₂ adsorption and activation. Notably, the catalyst delivers a high CO selectivity above 90% over a wide potential range and good stability. The formation of Fe–Te DASs elevates the Fermi level and strengthens the interaction of the 2 π_u orbital of CO₂, which is easier to bend and forms activated CO₂ intermediate, thereby decreasing the activation barrier and promoting the CO₂RR process. © 2023 Elsevier Inc.

关键词： CO2 reduction reaction diatomic sites electrocatalysis electron induction SDG7: Affordable and clean energy single atom catalysts

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Phase microstructure evaluation and microwave dielectric properties of (1-x)Mg_(0.95)Ni_(0.05)Ti_(0.98)Zr_(0.02)O_3–xCa_(0.6)La_(0.8/3)TiO_3 ceramics

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Journal of advanced Ceramics 2018年第1期7卷 72-78页

作者： Abdul MANAN Zahid ULLAH Arbab Safeer AHMAD Atta ULLAH Dil Faraz KHAN Arshad HUSSAIN Mati Ullah KHAN Laboratory for Research in Advanced Materials Department of Physics University of Science and TechnologyBannu Department of Physics Islamia College State Key Laboratory of Advanced Technology for Materials Synthesis and Processing School of Materials Science and Engineering Wuhan University of Technology Department of Chemistry University of Science and Technology Department of Physics Kohat University of Science and Technology

All the compositions in the(1-x)Mg_(0.95)Ni_(0.05)Ti_(0.98)Zr_(0.02)O_3–xCa_(0.6)La_(0.8/3)TiO_3(0 ≤ x ≤ 0.2) series were fabricated using solid state sintering route. Mg_(0.95)Ni_(0.05)Ti_(0.98)Zr_(0.02)O_3 possessed excellent microwave dielectric properties with ε_r ≈ 17.1, Q_uf_0 ≈ 195855 GHz, and τ_f ≈-46 ppm/℃. t f was tuned through zero by mixing with Ca_(0.6)La_(0.8/3)TiO_3. In the present study, τ_f ≈-2 ppm/℃ with er ≈ 23.9 and high Q_uf_0 ≈ 115870 GHz was achieved for x = 0.15, i.e., for a mixture of 85% Mg_(0.95)Ni_(0.05)Ti_(0.98)Zr_(0.02)O_3–xCa_(0.6)La_(0.8/3)TiO_3.

关键词： phase microstructure density ilmenite structure

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Effect of melt holding on morphological evolution and sedimentation behavior of iron-rich intermetallic phases in Al-Si-Fe-Mn-Mg alloy

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Transactions of Nonferrous Metals Society of China 2020年第1期30卷 1-13页

作者： Dong-fu SONG Shun-cheng WANG Yu-liang ZHAO Shu-hong LIU Yong DU Yue-hua KANG Zhi WANG Wei-wen ZHANG National Engineering Research Centre of Near-net-shape Forming for Metallic Materials South China University of TechnologyGuangzhou 510641China Guangdong Institute of Materials and Processing Guangzhou 510650China School of Mechanical Engineering Dongguan University of TechnologyDongguan 523808China State Key Laboratory of Powder Metallurgy Central South UniversityChangsha 410083China

The effect of the melt holding temperature on the morphological evolution and sedimentation behavior of iron-rich intermetallics in Al-7.0 Si-1.0 Fe-1.2 Mn-0.25 Mg alloy was investigated using an optical microscope,scanning electron microscope and differential thermal *** results show that as the holding temperature decreases,the morphologies of the primary iron-rich phase in matrix change from star-like to polygonal,and the number of the primary phases gradually decreases and disappears at 615°***,the Chinese script phases with small size,high compact and uniform distribution are *** contrast,the primary iron-rich phases in slag transform into a coarser polygonal shape with lower roundness,and some of them have hollow ***,the area fraction of intermetallics and Fe content in the matrix decrease gradually due to the formation and growth of sludge and subsequent natural sedimentation during melt *** the decrease of holding temperature,the main factors hindering the settlement of the primary phases are morphology,size,and density in turn.

关键词： Al-Si alloy melt holding iron-rich intermetallic phases morphological evolution sedimentation behaviour

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A new criterion for dual-objective optimization of thermoelectric devices

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materials Today Energy 2025年 52卷

作者： Pei, Jun Li, Hezhang Zhuang, Hua-Lu Dong, Jinfeng Yu, Jincheng Shan, Zhihang Zhang, Bo-Ping The Beijing Municipal Key Laboratory of New Energy Materials and Technologies School of Materials Science and Engineering University of Science and Technology Beijing Beijing100083 China Shunde Innovation School University of Science and Technology Beijing Foshan528399 China Department of Precision Instrument Tsinghua University Beijing100084 China State Key Laboratory of New Ceramics and Fine Processing School of Materials Science and Engineering Tsinghua University Beijing100084 China School of Materials Science and Engineering Nanyang Technological University Singapore 639798 Singapore

In recent years, remarkable strides have been made in the thermoelectric (TE) materials field. Mirco TE devices (micro-TEDs) fabricated from TE materials have attracted substantial attention owing to their promising applications in energy harvesting and thermal management fields. The design of the geometric structure in micro-TEDs serves as a crucial link bridging the thermoelectric properties of materials and the overall performance of these micro-TEDs. In this work, the minimum distance criterion (Cmd) was proposed to achieve relatively high-power density (Pd) and efficiency (η) at the same cross-sectional area ratio (x) and current (I). 5 pairs of n-type and p-type TE materials including Bi2Te3, Cu2Se + LAST, half-Heusler, Mg3Sb2, and SnSe were used to simulate the micro-TEDs. When x = 0.9, the Bi2Te3-based micro-TEDs can possess a relatively higher Pd,max and ηmax at the same I. According to the Cmd criterion, for the Cu2Se + LAST and SnSe micro-TEDs, the values of Pd,max, ηmax, ΔTmax, and Qcd,max can be increased by approximately 20 % compared to those of the x = 1.0 micro-TEDs. Cmd value is an effective descriptor to optimize cross-sectional area ratio of n-type and p-type TE legs for micro-TEDs. © 2025

关键词： Thermoelectric equipment

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Reaction Environment Regulation for Electrocatalytic CO2Reduction in Acids

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Angewandte Chemie 2024年第26期136卷

作者： Min Zeng Wensheng Fang Yiren Cen Xinyi Zhang Yongming Hu Prof. Bao Yu Xia Hubei Key Laboratory of Micro-Nanoelectronic Materials and Devices School of Microelectronics Hubei University 368 Youyi Road Wuhan 430062 China These authors contributed equally to this work School of Chemistry and Chemical Engineering State Key Laboratory of Materials Processing and Die & Mould Technology Key Laboratory of Material Chemistry for Energy Conversion and Storage (Ministry of Education) Hubei Key Laboratory of Material Chemistry and Service Failure Wuhan National Laboratory for Optoelectronics Huazhong University of Science and Technology (HUST) 1037 Luoyu Rd Wuhan 430074 China

The electrocatalytic CO 2 reduction reaction (CO 2 RR) is a sustainable route for converting CO 2 into value-added fuels and feedstocks, advancing a carbon-neutral economy. The electrolyte critically influences CO 2 utilization, reaction rate and product selectivity. While typically conducted in neutral/alkaline aqueous electrolytes, the CO 2 RR faces challenges due to (bi)carbonate formation and its crossover to the anolyte, reducing efficiency and stability. Acidic media offer promise by suppressing these processes, but the low Faradaic efficiency, especially for multicarbon (C 2+ ) products, and poor electrocatalyst stability persist. The effective regulation of the reaction environment at the cathode is essential to favor the CO 2 RR over the competitive hydrogen evolution reaction (HER) and improve long-term stability. This review examines progress in the acidic CO 2 RR, focusing on reaction environment regulation strategies such as electrocatalyst design, electrode modification and electrolyte engineering to promote the CO 2 RR. Insights into the reaction mechanisms via in situ/operando techniques and theoretical calculations are discussed, along with critical challenges and future directions in acidic CO 2 RR technology, offering guidance for developing practical systems for the carbon-neutral community.

关键词： Electrocatalytic CO2 reduction Acidic media Electrocatalyst Stability Microenvironment

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